Resonance Raman Spectra of the Complex Pentacyano-4-cyanopiridineferrate (II) and its 4-Cyanopiridine-Bridged Binuclear Complex with Ruthenium (II) Pentaamine Unit

CARLOS OMAR DELLA VEDOVA

JOURNAL OF RAMAN SPECTROSCOPY

JOHN WILEY & SONS LTD

Lugar: LOndres; Año: 1988 vol. 19 p. 453 - 455

0377-0486

Comparative resonance Raman effect (RRE) studies of both the kyanopyridine complex with thepentacyanoferrate(I1) anion, the first [Fe(CN),LI3- anion studied by RRE, and a binuclear complex formed by this anion with 4cyanopyridine as bridging ligand and a pentaamineruthenium(I1) moiety are reported. The RR spectra obtained show differences in the number of enhanced modes in each case. The spectroscopic data suggest coordination of the Fe(CN), unit through the pyridioe nitrogen of 4cyanopyridine in both the mononuclear and the binuclear complex. Assignment of the electronic spectra as being due to metal to ligand charge transfer (MLCT) (Fe" + pyridine-N, 4cyanopyridine) is proposed for the bands at 476 nm (aqueous solution) and 470 nm (solid dispersion in KBr) in both the mononuclear and the binuclear complex, respectively, and MLCT (Ru" * nitrile, kyanopyridine) for the band at 418 nm (solid) observed in the binuclear complex only. Excitation profiles of the 1600 cm- band in the mononuclear complex (in acetonitrilemethanol solution) and of the 1607, 1207 and 1020 cm-´ bands in the binuclear complex (as solid) were obtained and are interpreted.