319017-36-2Relevant academic research and scientific papers
Synthesis and characterization of a homologous series of mononuclear palladium complexes containing different cyclometalated ligands
Aiello, Iolinda,Crispini, Alessandra,Ghedini, Mauro,La Deda, Massimo,Barigelletti, Francesco
, p. 121 - 128 (2000)
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 (ε ~ 3 x 103 M-1 cm-1) and 531 nm (ε ~ 2 x 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. (C) 2000 Elsevier Science S.A.
