Metal ion size and coordination mode in complexes of a β-diketiminate ligand with pendant quinoline arms

Elodie E. Marlier; Daniel Sadowsky; Christopher J. Cramer; Kristopher McNeill

doi:10.1016/j.ica.2010.12.021

Metal ion size and coordination mode in complexes of a β-diketiminate ligand with pendant quinoline arms

Elodie E. Marlier, Daniel Sadowsky, Christopher J. Cramer, Kristopher McNeill

Chemistry (Twin Cities)

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

A suite of late first row transition metal complexes has been synthesized using a monoanionic nitrogen donor β-diketiminate ligand with quinolyl pendant arms, BDI^QQH (1). BDI^QQNiOTf (2), BDI ^QQCuCl (4), BDI^QQZnCl (5) were prepared from the reaction of 1 with Ni(OTf)₂, CuCl₂·2H₂O and ZnCl₂, respectively. BDI^QQNiCl (3) was synthesized from an anion exchange of 2 with ⁿBu₄NCl. Reaction of 1 and CoI₂ afforded the unexpected [(BDI^QQ)₂Co] ⁺I^- (6). Through density functional theory (DFT) calculations, ligand geometries in BDI^QQ complexes were investigated and it was found that smaller ionic radius and higher charge destabilize 1:1 metal-ligand complexes relative to alternative 1:2 complexes like 6 owing to significant conformational strain in 1:1 complexes involving metals with small ionic radii. Synthesis and characterization of these complexes, including crystal structures of 4 and 5, are reported, in addition to the results of DFT calculations.

Original language	English (US)
Pages (from-to)	173-179
Number of pages	7
Journal	Inorganica Chimica Acta
Volume	369
Issue number	1
DOIs	https://doi.org/10.1016/j.ica.2010.12.021
State	Published - Apr 15 2011

Bibliographical note

Funding Information:
This work was funded by the MHz NMR instrumentation was provided with funds from the NSF (BIR-961477), the University of Minnesota Medical School, and the Minnesota Medical Foundation. We gratefully acknowledge the reviewers for helpful comments that significantly improved the manuscript. National Science Foundation ( CHE-0809575 and 0952054 ). We thank Prof. Valerie Pierre for the use of her fluorescence and UV–Vis spectrophotometers, and we acknowledge Dr. Victor G. Young, Jr. and Lindsay Hinkle for help solving crystal structures. We also thank Dr. Letitia J. Yao for helpful NMR discussions. 800

Keywords

Conformation energy
Fluorescence
Quinoline
β-Diketiminate

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title = "Metal ion size and coordination mode in complexes of a β-diketiminate ligand with pendant quinoline arms",

abstract = "A suite of late first row transition metal complexes has been synthesized using a monoanionic nitrogen donor β-diketiminate ligand with quinolyl pendant arms, BDIQQH (1). BDIQQNiOTf (2), BDI QQCuCl (4), BDIQQZnCl (5) were prepared from the reaction of 1 with Ni(OTf)2, CuCl2·2H2O and ZnCl2, respectively. BDIQQNiCl (3) was synthesized from an anion exchange of 2 with nBu4NCl. Reaction of 1 and CoI2 afforded the unexpected [(BDIQQ)2Co] +I- (6). Through density functional theory (DFT) calculations, ligand geometries in BDIQQ complexes were investigated and it was found that smaller ionic radius and higher charge destabilize 1:1 metal-ligand complexes relative to alternative 1:2 complexes like 6 owing to significant conformational strain in 1:1 complexes involving metals with small ionic radii. Synthesis and characterization of these complexes, including crystal structures of 4 and 5, are reported, in addition to the results of DFT calculations.",

keywords = "Conformation energy, Fluorescence, Quinoline, β-Diketiminate",

author = "Marlier, {Elodie E.} and Daniel Sadowsky and Cramer, {Christopher J.} and Kristopher McNeill",

note = "Funding Information: This work was funded by the MHz NMR instrumentation was provided with funds from the NSF (BIR-961477), the University of Minnesota Medical School, and the Minnesota Medical Foundation. We gratefully acknowledge the reviewers for helpful comments that significantly improved the manuscript. National Science Foundation ( CHE-0809575 and 0952054 ). We thank Prof. Valerie Pierre for the use of her fluorescence and UV–Vis spectrophotometers, and we acknowledge Dr. Victor G. Young, Jr. and Lindsay Hinkle for help solving crystal structures. We also thank Dr. Letitia J. Yao for helpful NMR discussions. 800 ",

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T1 - Metal ion size and coordination mode in complexes of a β-diketiminate ligand with pendant quinoline arms

AU - Marlier, Elodie E.

AU - Sadowsky, Daniel

AU - Cramer, Christopher J.

AU - McNeill, Kristopher

N1 - Funding Information: This work was funded by the MHz NMR instrumentation was provided with funds from the NSF (BIR-961477), the University of Minnesota Medical School, and the Minnesota Medical Foundation. We gratefully acknowledge the reviewers for helpful comments that significantly improved the manuscript. National Science Foundation ( CHE-0809575 and 0952054 ). We thank Prof. Valerie Pierre for the use of her fluorescence and UV–Vis spectrophotometers, and we acknowledge Dr. Victor G. Young, Jr. and Lindsay Hinkle for help solving crystal structures. We also thank Dr. Letitia J. Yao for helpful NMR discussions. 800

PY - 2011/4/15

Y1 - 2011/4/15

N2 - A suite of late first row transition metal complexes has been synthesized using a monoanionic nitrogen donor β-diketiminate ligand with quinolyl pendant arms, BDIQQH (1). BDIQQNiOTf (2), BDI QQCuCl (4), BDIQQZnCl (5) were prepared from the reaction of 1 with Ni(OTf)2, CuCl2·2H2O and ZnCl2, respectively. BDIQQNiCl (3) was synthesized from an anion exchange of 2 with nBu4NCl. Reaction of 1 and CoI2 afforded the unexpected [(BDIQQ)2Co] +I- (6). Through density functional theory (DFT) calculations, ligand geometries in BDIQQ complexes were investigated and it was found that smaller ionic radius and higher charge destabilize 1:1 metal-ligand complexes relative to alternative 1:2 complexes like 6 owing to significant conformational strain in 1:1 complexes involving metals with small ionic radii. Synthesis and characterization of these complexes, including crystal structures of 4 and 5, are reported, in addition to the results of DFT calculations.

AB - A suite of late first row transition metal complexes has been synthesized using a monoanionic nitrogen donor β-diketiminate ligand with quinolyl pendant arms, BDIQQH (1). BDIQQNiOTf (2), BDI QQCuCl (4), BDIQQZnCl (5) were prepared from the reaction of 1 with Ni(OTf)2, CuCl2·2H2O and ZnCl2, respectively. BDIQQNiCl (3) was synthesized from an anion exchange of 2 with nBu4NCl. Reaction of 1 and CoI2 afforded the unexpected [(BDIQQ)2Co] +I- (6). Through density functional theory (DFT) calculations, ligand geometries in BDIQQ complexes were investigated and it was found that smaller ionic radius and higher charge destabilize 1:1 metal-ligand complexes relative to alternative 1:2 complexes like 6 owing to significant conformational strain in 1:1 complexes involving metals with small ionic radii. Synthesis and characterization of these complexes, including crystal structures of 4 and 5, are reported, in addition to the results of DFT calculations.

KW - Conformation energy

KW - Fluorescence

KW - Quinoline

KW - β-Diketiminate

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