Tyler J. Morin
- Courses4
- Reviews8
- School: Colby College
- Campus:
- Department: Chemistry
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Location:
4000 Mayflower Hill Dr
Waterville, ME - 04901 - Dates at Colby College: October 2011 - November 2012
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Biography
Colby College - Chemistry
Chemistry Professional Seeking Transition into Private Sector
Chemicals
Tyler
Morin
Minneapolis, Minnesota
My areas of strength translate the design and launch of complex experiments and contribute expertise in collaboration on scientific manuscripts, complex projects, and in-depth publications.
This level of data management reflects an exceptional ability in gathering, manipulating, and expressing data through design and extensive studies.
I have enjoyed a career as a trusted educator, partner, and project member dedicated to inclusive and successful project contributions, and scientific and technical proficiencies I intend to bring to the challenging and rewarding role outside of academia.
Experience
University of Minnesota
Postdoctoral Fellow
During my previous post as Postdoctoral Scholar of Inorganic and Materials Chemistry from 2013 to 2015, I designed and synthesized novel dye molecules and semiconducting nanoparticles used for modeling dye-sensitized solar cells and regularly communicate results during project funded by Department of Energy.
North Hennepin Community College
Adjunct Professor
As the college’s professor, I engage as many as 75 students in freshman-level Principles of Chemistry I Lecture and Laboratory, Principles of Chemistry II Lecture and Laboratory, Introduction to Chemistry Lecture, and laboratory.
I also:
• Serve as CHEMFoundations leader in conjunction with lecture instructor to identify and guide at-risk students to sustain their level of course understanding and results.
• Select, assign, assess, and grade homework and exams based upon established curriculum and daily course structure.
• Join hiring committee peers in defining faculty requirements and selecting adjunct professors to fill instructional needs.
Education
Marquette University
Ph.D.
Inorganic Chemistry
Graduate Research AssistantWinona State University
Bachelor of Science - BS
Chemistry
Undergraduate Research Assistant
Publications
Pyrazole methyls prescribe the electronic properties of iron(II) tetra (pyrazolyl) lutidine chloride complexes
Dalton Transactions/Royal Society of Chemistry
A series of iron(II) chloride complexes of pentadentate ligands related to α,α,α′,α′-tetra(pyrazolyl)-2,6-lutidine, pz4lut, has been prepared to evaluate whether pyrazolyl substitution has any systematic impact on the electronic properties of the complexes. For this purpose, the new tetrakis(3,4,5-trimethylpyrazolyl)lutidine ligand, pz**4lut, was prepared via a CoCl2-catalyzed rearrangement reaction. The equimolar combination of ligand and FeCl2 in methanol gives the appropriate 1 : 1 complexes [FeCl(pzR4lut)]Cl that are each isolated in the solid state as a hygroscopic solvate. In solution, the iron(II) complexes have been fully characterized by several spectroscopic methods and cyclic voltammetry. In the solid state, the complexes have been characterized by X-ray diffraction, and, in some cases, by Mössbauer spectroscopy. The Mössbauer studies show that the complexes remain high spin to 4 K and exclude spin-state changes as the cause of the surprising solid-state thermochromic properties of the complexes. Non-intuitive results of spectroscopic and structural studies showed that methyl substitution at the 3- and 5- positions of the pyrazolyl rings reduces the ligand field strength through steric effects whereas methyl substitution at the 4-position of the pyrazolyl rings increases the ligand field strength through inductive effects.
Pyrazole methyls prescribe the electronic properties of iron(II) tetra (pyrazolyl) lutidine chloride complexes
Dalton Transactions/Royal Society of Chemistry
A series of iron(II) chloride complexes of pentadentate ligands related to α,α,α′,α′-tetra(pyrazolyl)-2,6-lutidine, pz4lut, has been prepared to evaluate whether pyrazolyl substitution has any systematic impact on the electronic properties of the complexes. For this purpose, the new tetrakis(3,4,5-trimethylpyrazolyl)lutidine ligand, pz**4lut, was prepared via a CoCl2-catalyzed rearrangement reaction. The equimolar combination of ligand and FeCl2 in methanol gives the appropriate 1 : 1 complexes [FeCl(pzR4lut)]Cl that are each isolated in the solid state as a hygroscopic solvate. In solution, the iron(II) complexes have been fully characterized by several spectroscopic methods and cyclic voltammetry. In the solid state, the complexes have been characterized by X-ray diffraction, and, in some cases, by Mössbauer spectroscopy. The Mössbauer studies show that the complexes remain high spin to 4 K and exclude spin-state changes as the cause of the surprising solid-state thermochromic properties of the complexes. Non-intuitive results of spectroscopic and structural studies showed that methyl substitution at the 3- and 5- positions of the pyrazolyl rings reduces the ligand field strength through steric effects whereas methyl substitution at the 4-position of the pyrazolyl rings increases the ligand field strength through inductive effects.
Breaking the Cycle: Impact of Sterically-Tailored Tetra(pyrazolyl)lutidines on the Self-Assembly of Silver(I) Complexes
Inorganic Chemistry/American Chemical Society
A improved preparation of the pentadentate ligand α,α,α′,α′-tetra(pyrazolyl)lutidine, pz4lut, and the syntheses of three new alkyl-substituted pyrazolyl derivatives pz4′4lut (pz4′ = 4-methylpyrazolyl), pz*4lut (pz* = 3,5-dimethylpyrazolyl), and pzDIP4lut (pzDIP = 3,5-diisopropylpyrazolyl) are described. The silver(I) complexes of these ligands were studied to ascertain the impact of pyrazolyl substitution, if any, on their binding modes and on solubility issues. In the solid state, [Ag(pz4lut)](BF4) (1), [Ag(pz4′4lut)](BF4) (2), and [Ag(pz*4lut)](BF4) (3) give cyclic dications as a result of two ligands sandwiching two silver centers where each ligand binds the metals through only pyrazolyl nitrogen donors. This cyclic motif is similar to those observed in the silver complexes of tetra(pyridyl)lutidine PY5-R derivatives (where the central pyridyl does not bind) and in related tetra(pyrazolyl)-m-xylene complexes. While suitable single crystals of [Ag(pzDIP4lut)](BF4) (4) could not be obtained, those of [Ag(pzDIP4lut)](OTf) (5) showed infinite polymeric chains secured via silver-bound μ-κ2Npz,κ2Npz- ligands. The different binding mode of the latter ligand versus the former three is likely due to unfavorable steric interactions between the bulky iso-propyl (pyrazolyl) substituents and the central pyridyl rings of hypothetical cyclic architectures. The combined electrospray ionization mass spectrometry (ESI(+)-MS), variable-temperature NMR (VT NMR), and diffusion pulsed field-gradient spin−echo (PFGSE) NMR data indicate that the solid state structures of each 1−5 are neither retained nor static in CD3CN, rather the cations are monomeric in solution.
Pyrazole methyls prescribe the electronic properties of iron(II) tetra (pyrazolyl) lutidine chloride complexes
Dalton Transactions/Royal Society of Chemistry
A series of iron(II) chloride complexes of pentadentate ligands related to α,α,α′,α′-tetra(pyrazolyl)-2,6-lutidine, pz4lut, has been prepared to evaluate whether pyrazolyl substitution has any systematic impact on the electronic properties of the complexes. For this purpose, the new tetrakis(3,4,5-trimethylpyrazolyl)lutidine ligand, pz**4lut, was prepared via a CoCl2-catalyzed rearrangement reaction. The equimolar combination of ligand and FeCl2 in methanol gives the appropriate 1 : 1 complexes [FeCl(pzR4lut)]Cl that are each isolated in the solid state as a hygroscopic solvate. In solution, the iron(II) complexes have been fully characterized by several spectroscopic methods and cyclic voltammetry. In the solid state, the complexes have been characterized by X-ray diffraction, and, in some cases, by Mössbauer spectroscopy. The Mössbauer studies show that the complexes remain high spin to 4 K and exclude spin-state changes as the cause of the surprising solid-state thermochromic properties of the complexes. Non-intuitive results of spectroscopic and structural studies showed that methyl substitution at the 3- and 5- positions of the pyrazolyl rings reduces the ligand field strength through steric effects whereas methyl substitution at the 4-position of the pyrazolyl rings increases the ligand field strength through inductive effects.
Breaking the Cycle: Impact of Sterically-Tailored Tetra(pyrazolyl)lutidines on the Self-Assembly of Silver(I) Complexes
Inorganic Chemistry/American Chemical Society
A improved preparation of the pentadentate ligand α,α,α′,α′-tetra(pyrazolyl)lutidine, pz4lut, and the syntheses of three new alkyl-substituted pyrazolyl derivatives pz4′4lut (pz4′ = 4-methylpyrazolyl), pz*4lut (pz* = 3,5-dimethylpyrazolyl), and pzDIP4lut (pzDIP = 3,5-diisopropylpyrazolyl) are described. The silver(I) complexes of these ligands were studied to ascertain the impact of pyrazolyl substitution, if any, on their binding modes and on solubility issues. In the solid state, [Ag(pz4lut)](BF4) (1), [Ag(pz4′4lut)](BF4) (2), and [Ag(pz*4lut)](BF4) (3) give cyclic dications as a result of two ligands sandwiching two silver centers where each ligand binds the metals through only pyrazolyl nitrogen donors. This cyclic motif is similar to those observed in the silver complexes of tetra(pyridyl)lutidine PY5-R derivatives (where the central pyridyl does not bind) and in related tetra(pyrazolyl)-m-xylene complexes. While suitable single crystals of [Ag(pzDIP4lut)](BF4) (4) could not be obtained, those of [Ag(pzDIP4lut)](OTf) (5) showed infinite polymeric chains secured via silver-bound μ-κ2Npz,κ2Npz- ligands. The different binding mode of the latter ligand versus the former three is likely due to unfavorable steric interactions between the bulky iso-propyl (pyrazolyl) substituents and the central pyridyl rings of hypothetical cyclic architectures. The combined electrospray ionization mass spectrometry (ESI(+)-MS), variable-temperature NMR (VT NMR), and diffusion pulsed field-gradient spin−echo (PFGSE) NMR data indicate that the solid state structures of each 1−5 are neither retained nor static in CD3CN, rather the cations are monomeric in solution.
Schlenk Lines, and the Vacuum Transfer of Solvents
JoVE Science Education Database
Schlenk lines and high vacuum lines are both used to exclude moisture and oxygen from reactions by running reactions under a slight overpressure of inert gas (usually N2 or Ar) or under vacuum. Vacuum transfer has been developed as a method separate solvents (other volatile reagents) from drying agents (or other nonvolatile agents) and dispense them to reaction or storage vessels while maintaining an air-free environment. Similar to thermal distillations, vacuum transfer separates solvents by vaporizing and condensing them in another receiving vessel; however, vacuum transfers utilize the low pressure in the manifolds of Schlenk and high vacuum lines to lower boiling points to room temperature or below, allowing for cryogenic distillations. This technique can provide a safer alternative to thermal distillation for the collection of air- and moisture-free solvents. After the vacuum transfer, the water content of the collected solvent can be tested quantitatively by Karl Fischer titration, qualitatively by titration with a Na/Ph2CO solution, or by 1H NMR spectroscopy.
Pyrazole methyls prescribe the electronic properties of iron(II) tetra (pyrazolyl) lutidine chloride complexes
Dalton Transactions/Royal Society of Chemistry
A series of iron(II) chloride complexes of pentadentate ligands related to α,α,α′,α′-tetra(pyrazolyl)-2,6-lutidine, pz4lut, has been prepared to evaluate whether pyrazolyl substitution has any systematic impact on the electronic properties of the complexes. For this purpose, the new tetrakis(3,4,5-trimethylpyrazolyl)lutidine ligand, pz**4lut, was prepared via a CoCl2-catalyzed rearrangement reaction. The equimolar combination of ligand and FeCl2 in methanol gives the appropriate 1 : 1 complexes [FeCl(pzR4lut)]Cl that are each isolated in the solid state as a hygroscopic solvate. In solution, the iron(II) complexes have been fully characterized by several spectroscopic methods and cyclic voltammetry. In the solid state, the complexes have been characterized by X-ray diffraction, and, in some cases, by Mössbauer spectroscopy. The Mössbauer studies show that the complexes remain high spin to 4 K and exclude spin-state changes as the cause of the surprising solid-state thermochromic properties of the complexes. Non-intuitive results of spectroscopic and structural studies showed that methyl substitution at the 3- and 5- positions of the pyrazolyl rings reduces the ligand field strength through steric effects whereas methyl substitution at the 4-position of the pyrazolyl rings increases the ligand field strength through inductive effects.
Breaking the Cycle: Impact of Sterically-Tailored Tetra(pyrazolyl)lutidines on the Self-Assembly of Silver(I) Complexes
Inorganic Chemistry/American Chemical Society
A improved preparation of the pentadentate ligand α,α,α′,α′-tetra(pyrazolyl)lutidine, pz4lut, and the syntheses of three new alkyl-substituted pyrazolyl derivatives pz4′4lut (pz4′ = 4-methylpyrazolyl), pz*4lut (pz* = 3,5-dimethylpyrazolyl), and pzDIP4lut (pzDIP = 3,5-diisopropylpyrazolyl) are described. The silver(I) complexes of these ligands were studied to ascertain the impact of pyrazolyl substitution, if any, on their binding modes and on solubility issues. In the solid state, [Ag(pz4lut)](BF4) (1), [Ag(pz4′4lut)](BF4) (2), and [Ag(pz*4lut)](BF4) (3) give cyclic dications as a result of two ligands sandwiching two silver centers where each ligand binds the metals through only pyrazolyl nitrogen donors. This cyclic motif is similar to those observed in the silver complexes of tetra(pyridyl)lutidine PY5-R derivatives (where the central pyridyl does not bind) and in related tetra(pyrazolyl)-m-xylene complexes. While suitable single crystals of [Ag(pzDIP4lut)](BF4) (4) could not be obtained, those of [Ag(pzDIP4lut)](OTf) (5) showed infinite polymeric chains secured via silver-bound μ-κ2Npz,κ2Npz- ligands. The different binding mode of the latter ligand versus the former three is likely due to unfavorable steric interactions between the bulky iso-propyl (pyrazolyl) substituents and the central pyridyl rings of hypothetical cyclic architectures. The combined electrospray ionization mass spectrometry (ESI(+)-MS), variable-temperature NMR (VT NMR), and diffusion pulsed field-gradient spin−echo (PFGSE) NMR data indicate that the solid state structures of each 1−5 are neither retained nor static in CD3CN, rather the cations are monomeric in solution.
Schlenk Lines, and the Vacuum Transfer of Solvents
JoVE Science Education Database
Schlenk lines and high vacuum lines are both used to exclude moisture and oxygen from reactions by running reactions under a slight overpressure of inert gas (usually N2 or Ar) or under vacuum. Vacuum transfer has been developed as a method separate solvents (other volatile reagents) from drying agents (or other nonvolatile agents) and dispense them to reaction or storage vessels while maintaining an air-free environment. Similar to thermal distillations, vacuum transfer separates solvents by vaporizing and condensing them in another receiving vessel; however, vacuum transfers utilize the low pressure in the manifolds of Schlenk and high vacuum lines to lower boiling points to room temperature or below, allowing for cryogenic distillations. This technique can provide a safer alternative to thermal distillation for the collection of air- and moisture-free solvents. After the vacuum transfer, the water content of the collected solvent can be tested quantitatively by Karl Fischer titration, qualitatively by titration with a Na/Ph2CO solution, or by 1H NMR spectroscopy.
Homoleptic Nickel (II) Complexes of Redox-Tunable Pincer Type Ligands
Inorganic Chemistry/American Chemical Society
Different synthetic methods have been developed to prepare eight new redox-active pincer-type ligands, H(X,Y), that have pyrazol-1-yl flanking donors attached to an ortho-position of each ring of a diarylamine anchor and that have different groups, X and Y, at the para-aryl positions. Together with four previously known H(X,Y) ligands, a series of 12 Ni(X,Y)2 complexes were prepared in high yields by a simple one-pot reaction. Six of the 12 derivatives were characterized by single-crystal X-ray diffraction, which showed tetragonally distorted hexacoordinate nickel(II) centers. The nickel(II) complexes exhibit two quasi-reversible one-electron oxidation waves in their cyclic voltammograms, with half-wave potentials that varied over a remarkable 700 mV range with the average of the Hammett σp parameters of the para-aryl X, Y groups. The one- and two-electron oxidized derivatives [Ni(Me,Me)2](BF4)n (n = 1, 2) were prepared synthetically, were characterized by X-band EPR, electronic spectroscopy, and single-crystal X-ray diffraction (for n = 2), and were studied computationally by DFT methods. The dioxidized complex, [Ni(Me,Me)2](BF4)2, is an S = 2 species, with nickel(II) bound to two ligand radicals. The mono-oxidized complex [Ni(Me,Me)2](BF4), prepared by comproportionation, is best described as nickel(II) with one ligand centered radical. Neither the mono- nor the dioxidized derivative shows any substantial electronic coupling between the metal and their bound ligand radicals because of the orthogonal nature of their magnetic orbitals. On the other hand, weak electronic communication occurs between ligands in the mono-oxidized complex as evident from the intervalence charge transfer (IVCT) transition found in the near-IR absorption spectrum. Band shape analysis of the IVCT transition allowed comparisons of the strength of the electronic interaction with that in the related, previously known, Robin–Day class II mixed valence complex, [Ga(Me,Me)2]2+.
Pyrazole methyls prescribe the electronic properties of iron(II) tetra (pyrazolyl) lutidine chloride complexes
Dalton Transactions/Royal Society of Chemistry
A series of iron(II) chloride complexes of pentadentate ligands related to α,α,α′,α′-tetra(pyrazolyl)-2,6-lutidine, pz4lut, has been prepared to evaluate whether pyrazolyl substitution has any systematic impact on the electronic properties of the complexes. For this purpose, the new tetrakis(3,4,5-trimethylpyrazolyl)lutidine ligand, pz**4lut, was prepared via a CoCl2-catalyzed rearrangement reaction. The equimolar combination of ligand and FeCl2 in methanol gives the appropriate 1 : 1 complexes [FeCl(pzR4lut)]Cl that are each isolated in the solid state as a hygroscopic solvate. In solution, the iron(II) complexes have been fully characterized by several spectroscopic methods and cyclic voltammetry. In the solid state, the complexes have been characterized by X-ray diffraction, and, in some cases, by Mössbauer spectroscopy. The Mössbauer studies show that the complexes remain high spin to 4 K and exclude spin-state changes as the cause of the surprising solid-state thermochromic properties of the complexes. Non-intuitive results of spectroscopic and structural studies showed that methyl substitution at the 3- and 5- positions of the pyrazolyl rings reduces the ligand field strength through steric effects whereas methyl substitution at the 4-position of the pyrazolyl rings increases the ligand field strength through inductive effects.
Breaking the Cycle: Impact of Sterically-Tailored Tetra(pyrazolyl)lutidines on the Self-Assembly of Silver(I) Complexes
Inorganic Chemistry/American Chemical Society
A improved preparation of the pentadentate ligand α,α,α′,α′-tetra(pyrazolyl)lutidine, pz4lut, and the syntheses of three new alkyl-substituted pyrazolyl derivatives pz4′4lut (pz4′ = 4-methylpyrazolyl), pz*4lut (pz* = 3,5-dimethylpyrazolyl), and pzDIP4lut (pzDIP = 3,5-diisopropylpyrazolyl) are described. The silver(I) complexes of these ligands were studied to ascertain the impact of pyrazolyl substitution, if any, on their binding modes and on solubility issues. In the solid state, [Ag(pz4lut)](BF4) (1), [Ag(pz4′4lut)](BF4) (2), and [Ag(pz*4lut)](BF4) (3) give cyclic dications as a result of two ligands sandwiching two silver centers where each ligand binds the metals through only pyrazolyl nitrogen donors. This cyclic motif is similar to those observed in the silver complexes of tetra(pyridyl)lutidine PY5-R derivatives (where the central pyridyl does not bind) and in related tetra(pyrazolyl)-m-xylene complexes. While suitable single crystals of [Ag(pzDIP4lut)](BF4) (4) could not be obtained, those of [Ag(pzDIP4lut)](OTf) (5) showed infinite polymeric chains secured via silver-bound μ-κ2Npz,κ2Npz- ligands. The different binding mode of the latter ligand versus the former three is likely due to unfavorable steric interactions between the bulky iso-propyl (pyrazolyl) substituents and the central pyridyl rings of hypothetical cyclic architectures. The combined electrospray ionization mass spectrometry (ESI(+)-MS), variable-temperature NMR (VT NMR), and diffusion pulsed field-gradient spin−echo (PFGSE) NMR data indicate that the solid state structures of each 1−5 are neither retained nor static in CD3CN, rather the cations are monomeric in solution.
Schlenk Lines, and the Vacuum Transfer of Solvents
JoVE Science Education Database
Schlenk lines and high vacuum lines are both used to exclude moisture and oxygen from reactions by running reactions under a slight overpressure of inert gas (usually N2 or Ar) or under vacuum. Vacuum transfer has been developed as a method separate solvents (other volatile reagents) from drying agents (or other nonvolatile agents) and dispense them to reaction or storage vessels while maintaining an air-free environment. Similar to thermal distillations, vacuum transfer separates solvents by vaporizing and condensing them in another receiving vessel; however, vacuum transfers utilize the low pressure in the manifolds of Schlenk and high vacuum lines to lower boiling points to room temperature or below, allowing for cryogenic distillations. This technique can provide a safer alternative to thermal distillation for the collection of air- and moisture-free solvents. After the vacuum transfer, the water content of the collected solvent can be tested quantitatively by Karl Fischer titration, qualitatively by titration with a Na/Ph2CO solution, or by 1H NMR spectroscopy.
Homoleptic Nickel (II) Complexes of Redox-Tunable Pincer Type Ligands
Inorganic Chemistry/American Chemical Society
Different synthetic methods have been developed to prepare eight new redox-active pincer-type ligands, H(X,Y), that have pyrazol-1-yl flanking donors attached to an ortho-position of each ring of a diarylamine anchor and that have different groups, X and Y, at the para-aryl positions. Together with four previously known H(X,Y) ligands, a series of 12 Ni(X,Y)2 complexes were prepared in high yields by a simple one-pot reaction. Six of the 12 derivatives were characterized by single-crystal X-ray diffraction, which showed tetragonally distorted hexacoordinate nickel(II) centers. The nickel(II) complexes exhibit two quasi-reversible one-electron oxidation waves in their cyclic voltammograms, with half-wave potentials that varied over a remarkable 700 mV range with the average of the Hammett σp parameters of the para-aryl X, Y groups. The one- and two-electron oxidized derivatives [Ni(Me,Me)2](BF4)n (n = 1, 2) were prepared synthetically, were characterized by X-band EPR, electronic spectroscopy, and single-crystal X-ray diffraction (for n = 2), and were studied computationally by DFT methods. The dioxidized complex, [Ni(Me,Me)2](BF4)2, is an S = 2 species, with nickel(II) bound to two ligand radicals. The mono-oxidized complex [Ni(Me,Me)2](BF4), prepared by comproportionation, is best described as nickel(II) with one ligand centered radical. Neither the mono- nor the dioxidized derivative shows any substantial electronic coupling between the metal and their bound ligand radicals because of the orthogonal nature of their magnetic orbitals. On the other hand, weak electronic communication occurs between ligands in the mono-oxidized complex as evident from the intervalence charge transfer (IVCT) transition found in the near-IR absorption spectrum. Band shape analysis of the IVCT transition allowed comparisons of the strength of the electronic interaction with that in the related, previously known, Robin–Day class II mixed valence complex, [Ga(Me,Me)2]2+.
Molecular Motion and Performance Enhancement of BORAZAN Fluorescent Dyes
European Journal of Inorganic Chemistry/Wiley
The preparation of three 2,6‐dipyrazolyl‐4‐X‐anilines, H(pz2AnX) (X = p‐CF3, Cl, tBu) using CuI‐catalyzed amination is described. Subsequent reactions of H(pz2AnX) with triphenylboron proceeds with benzene elimination to give the corresponding Ph2B(pz2AnX) compounds in high yields. The Ph2B(pz2AnX) are more highly emissive in the solid state than the previously reported BORAZAN fluorophores, Ph2B(pzAnX), their monopyrazolyl counterparts. As with the Ph2B(pzAnX), the color of emission in Ph2B(pz2AnX) can be tuned simply by varying the para‐aniline substituent where the emission of Ph2B(pz2AnX) is red‐shifted relative to the corresponding Ph2B(pzAnX) derivatives. The electronic properties were studied by cyclic voltammetry and electronic absorption/emission spectroscopy as well as by density functional calculations (B3LYP/6‐31G*). The di‐pyrazolyl derivatives exhibit greater stability toward solvolysis and higher photoluminescent quantum yields (despite the red‐shift in emission) compared to their monopyrazolyl counterparts presumably due to kinetic stabilization of the chromophore imparted by the second pyrazolyl ligand. For Ph2B(pz2AnX), evidence for intramolecular motion of the diphenylboryl moiety traversing both pyrazolyl groups was detected by variable temperature 1H NMR spectroscopy. The rate increases with increasing electron‐donor abilities of the para‐aniline substituent
