| Abstract |
A new family of three-legged piano stool structured organometallic compounds containing the fragment eta(5)-cyclopentadienyl-ruthenium(II)/ iron(II) has been synthesized to evaluate the existence of electronic metal to ligand charge transfer upon coordination of the novel benzodithiophene ligands (BDT), benzo[1,2-b; 4,3-b ] dithiophen-2-carbonitrile (L1) and benzo[1,2-b; 4,3-b ] dithiophen-2 nitro-2-carbonitrile (L2). All the compounds were characterized by H-1, C-13, P-31 NMR, IR and UV-Vis. spectroscopies and their electrochemistry studied by cyclic voltammetry. The X-ray structures of [Ru(eta(5)-C5H5)(PPh3) 2( NCC10H5S2)][PF6] (1Ru), [Ru(eta(5)-C5H5)(PPh3)(2)(NCC10H5S2)][CF3SO3] (1 Ru), [Ru(eta(5)-C5H5)(DPPE)(NCC10H5S2)][ PF6] 2Ru and [Fe(eta(5)-C5H5)(DPPE)(NCC10H5S2)][PF6] (2Fe) were determined by X-ray diffraction showing centric crystallization on groups P (1) over bar and P2(1)/n, respectively. Quadratic hyperpolarizabilities (beta) of some of the complexes (2Fe, 2Ru and 3Fe) have been determined by hyper-Rayleigh scattering (HRS) measurements at a fundamental wavelength of 1500 nm, to minimize the probability of fluorescence due to two-photon absorption and to reduce the effect of resonance enhancement, in order to estimate static beta values. (C) 2008 Elsevier B. V. All rights reserved. |
