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Synthesis and characterization of a homologous series of mononuclear palladium complexes containing different cyclometalated ligands

Authors :
Alessandra Crispini
Massimo La Deda
Mauro Ghedini
Iolinda Aiello
Francesco Barigelletti
Source :
Inorganica Chimica Acta. 308:121-128
Publication Year :
2000
Publisher :
Elsevier BV, 2000.

Abstract

New mononuclear palladium(II) complexes formed by with 2-hydroxy-4-(n-hexyloxybenzylidene)-4′-n-hexyaniline (HL) and 2-phenylpyridine (I), benzo[h]quinoline (II), azobenzene (III), 2-benzoylpyridine (IV) or phenyl-2-pyridylketone-2,4-dinitrophenylhydrazone (V) have been synthesized and characterized by analytical and spectroscopic methods and the single-crystal structures of [(IVa)Pd(L)] and [(Va)Pd(L)] have been established. The spectroscopic and diffractrometric data account for molecular structures wherein the palladium(II) center is part of two chelate rings involving HL and one of the I–V ligands which form a five-member N,C{[(Ia)PdL], [(IIa)Pd(L)] and [(IIIa)Pd(L)]}, a six-member N,C{[(IVa)Pd(L)]}, or a six-member N,N′{[(Va)Pd(L)]} metallacycle. The electronic spectra of [(IIIa)Pd(L)] and [(Va)Pd(L)] show an absorption maxima, at 495 (e∼3×103 M−1 cm−1) and 531 nm (e∼2×104 M−1 cm−1), respectively, which results are significantly affected by the polarity of the solvent. These chromophores should therefore be of interest for the preparation of nonlinear optical materials.

Details

ISSN :
00201693
Volume :
308
Database :
OpenAIRE
Journal :
Inorganica Chimica Acta
Accession number :
edsair.doi...........2450e89acba1a4bf00a733b4bd087add
Full Text :
https://doi.org/10.1016/s0020-1693(00)00216-4