Reaction of Re-2{mu-O2CC(CH3)(3)}(4)Cl-2 with [(CO)(5)M-CN]Na (M = Cr, Mo, W) leads to tetranuclear complexes of formula Re-2{mu-O2CC(CH3)(3)}(4)[-NC-M(CO)(5)](2) (M = Cr, Mo, W). These complexes were characterized by H-1-, C-13-, and Mo-95-NMR, IR and Raman spectroscopy, elemental analysis and examined by cyclic voltammetry. The applied methods show the donor capabilities of the [(CO)(5)M-CN](-) ligands which shift electron density towards the Re centers weakening the Re-Re quadruple bond. The Re-Re bond lengths and the v(Re-Re) force constants are estimated based on the FT-IR and Raman examinations. Photochemical examinations and TG/MS experiments have also been conducted. The latter methods shows that the product complexes decompose around 100 degrees C, by first loosing their carbonyl substituents; as do the Cr, Mo, W precursor compounds. The dirhenium tetrapivalate unit decomposes only at higher temperatures in a distinct second step.
ISI Document Delivery No.: 161EKTimes Cited: 17
Cited Reference Count: 42
Kuhn, FE Goncalves, IS Lopes, AD Lopes, JP Romao, CC Wachter, W Mink, J Hajba, L Parola, AJ Pina, F Sotomayor, J
Kuhn, Fritz/A-3113-2010; Pina, Fernando/C-8161-2011; Lopes, Andre/E-2136-2012; Romao, Carlos /D-1162-2010; Parola, A. Jorge/F-4048-2010; Sotomayor, Joao/D-8103-2013; Goncalves, Isabel/H-3742-2013
Romao, Carlos /0000-0001-5061-3743; Parola, A. Jorge/0000-0002-1333-9076; Sotomayor, Joao/0000-0002-4589-0591;
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