Document Type
Article
Article Version
Post-print
Publication Date
2013
Abstract
A novel ambidentate tridentate pincer ligand based on a bis-triazole precursor, was prepared, characterized, and metallated with ZnCl2 to give a new tridentate NNN-bound pincer zinc(II) pincer complex: dichloro(η3-N,N,N)-[2,6-bis(3-[N-butyl]triazol-5-thione-1-yl)]pyridinezinc(II), [(NNN)ZnCl2]. This compound has pseudo-trigonal bipyramidal geometry at the zinc(II) center and exhibits metal–ligand binding that contrasts with our previously reported SNS-bound systems despite the availability of these same donor atoms in the current ligand set. The zinc complex was characterized with single crystal X-ray diffraction, 1H, 13C, and HSQC NMR spectroscopies, and electrospray mass spectrometry. The ligand precursors were characterized with 1H, 13C, and HSQC NMR spectroscopies, and cyclic voltammetry, and were found to be redox active. Density functional calculations, which investigate and support the nature of the NNN binding suggest that the experimentally observed oxidation and reduction waves are not the result of a simple one-electron process. The zinc complex was screened for the reduction of electron-poor aldehydes in the presence of a hydrogen donor, 1-benzyl-1,4-dihydronicotinamide (BNAH), and it was determined that they enhance the reduction of 4-nitrobenzaldehyde. Quantitative stoichiometric conversion was seen for the reduction of pyridine-2-carboxaldehyde.
Publication Title
Inorganica Chimica Acta
Repository Citation
Miecznikowski, John R.; Jasinski, Jerry P.; Lynn, Matthew A.; Jain, Swapan S.; Butrick, Elizabeth E.; Drozdoski, Anne Elise R.; Archer, Kerry A.; and Panarra, Jason T., "Synthesis, Characterization, Density Functional Theory Calculations, and Activity of a Thione-Containing NNN-Zinc Pincer Complex Based on a Bis-triazole Precursor" (2013). Chemistry & Biochemistry Faculty Publications. 16.
https://digitalcommons.fairfield.edu/chemistry-facultypubs/16
Published Citation
Miecznikowski, J.R.; Jasinski, J.P.; Lynn, M.A.; Jain, S.; Butrick, E.E.; Drozdoski, A.R.; Archer, K.A.; Panarra, J.T. “Synthesis, Characterization, Density Functional Theory Calculations, and Activity of a Thione-Containing NNN-Zinc Pincer Complex Based on a Bis-triazole Precursor.” Inorganica Chimica Acta, 2013, 394, 310-321.
DOI
10.1016/j.ica.2012.07.009
Peer Reviewed
Comments
Copyright 2013 Elsevier
NOTICE: this is the author’s version of a work that was accepted for publication in Inorganica Chimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Inorganica Chimica Acta, 2013, 394, 310-321. DOI:10.1016/j.ica.2012.07.009