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Infrared spectra of K 2 [RuCl 5 NO] in two excited metastable states and the evidence for the NO linkage photoisomerization of metastable state I (MSI) in [RuX 5 NO] 2− (X=Cl, CN)

2002; Elsevier BV; Volume: 609; Issue: 1-3 Linguagem: Inglês

10.1016/s0022-2860(01)00897-3

1872-8014

Jorge A. Güida, Mauricio A. V. Ramos, Oscar E. Piro, P. J. Aymonino,

Organometallic Complex Synthesis and Catalysis

Low temperature IR vibrational spectra of light induced metastable states I and II (MSI and MSII) of K2[RuCl5NO] are presented and discussed here. MSII bands and some MSI features are reported for the first time. Some of the MSI bands confirm Raman spectroscopic observations. The thermal deactivation of MSI and MSII states occur at temperatures TMSI>TMSII. This is the same ordering observed for Na2[Fe(CN)5NO]·2H2O and certain other RuNO complexes but opposite to that found for Na2[M(CN)5NO]·2H2O (M=Ru, Os). Evidence for the RuON structure of MSI is provided for [RuL5NO]2− (L=CN, Cl) as results of the analysis of ν(NO) differences between 15/14N(16O) and 18/16O(14N) pairs of natural isotopic compositions.