1. Nickel(II) and Palladium(II) Complexes of N-(2-Hydroxyphenyl)Salicylamides. Synthesis, Structure, and Electrochemical Properties
- Author
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Tadashi Tokii, Kouichi Inamoto, Masayuki Koikawa, Naohide Matsumoto, Hiroshi Maeda, Sigeo Kida, and Hisashi Ōkawa
- Subjects
Ligand ,Inorganic chemistry ,chemistry.chemical_element ,Salicylamide ,Electrochemistry ,Inorganic Chemistry ,Metal ,Nickel ,Crystallography ,Unpaired electron ,chemistry ,visual_art ,visual_art.visual_art_medium ,medicine ,Physical and Theoretical Chemistry ,Absorption (chemistry) ,Palladium ,medicine.drug - Abstract
N-(2-Hydroxyphenyl)salicylamide (H3L1) and N-(2-hydroxy-5-chlorophenyl)salicylamide (H3L2) formed diamagnetic nickel(II) and palladium(II) complexes of the composition (PBu4)2[M(L)(H2L)] (PBu4 + = tetrabutylphosphonium ion; M = Ni, Pd; L = L1, L2). Single-crystal X-ray analysis for (PBu4)2[Pd(L1)(H2L1)] revealed that one ligand (L1)3-coordinates terdentately and the other ligand (H2L1)-coordinates unidentately at the phenolic oxygen of the “salicylamide” entity, affording a planar configuration around the metal ion. In cyclic voltammograms both Ni and Pd complexes showed one oxidation wave attributable to the process M(II)/M(III) at a significantly low potential. The Ni(III) and Pd(III) species of the L2 complex were generated by electrochemical oxidation and identified by electronic absorption and ESR spectra. Based on electronic absorption and ESR spectra, a considerable delocalization of the unpaired electron onto the ligand orbitals was suggested for both Ni(III) and Pd(III) complexes.
- Published
- 1995