Interpretation of the Electronic Spectra of Ruthenium Nitrosyl Complexes with Nitrogen-containing Heterocyclic Ligands

Author： Sizova O. V. Ivanova N. V. Lyubimova O. O. Nikol'skii A. B.

ISSN： 1070-3632

Source： Russian Journal of General Chemistry, Vol.74, Iss.2, 2004-02, pp. : 155-163

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

The electronic absorption spectra of ruthenium nitrosyl complexes with nitrogen-containing heterocyclic ligands were analyzed on the basis of ab initio and CINDO/CI semiempirical calculations of free ligands L and complexes trans-[Ru(NO)(NH₃)₄(L)]³⁺ (L = pyridine, pyrazine, nicotinamide, isonicotinamide, l-histidine, imidazole). Spectral manifestations of a strong covalent Ru-NO bond were observed to conclude that the oxidation states of Ru and NO in the RuNO³⁺ group are expedient to represent as Ru(III) and NO⁰. Introduction of a nitrosyl group into the inner coordination sphere of Ru(II) complexes with nitrogen-containing heterocyclic ligands much affects the entire spectral patterns and denudes these ligands of the capacity to exhibit chromophoric properties.