학술논문
Edge-sharing bi-octahedral diruthenium(IV,IV) compounds containing Ru–Ru bonds chelated and bridged by two carbonate and two oxo groups.
Document Type
Article
Author
Source
Subject
*CHELATES
*PIPERAZINE
*RAMAN spectroscopy
*CARBONATES
*LIGANDS (Chemistry)
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Language
ISSN
1477-9226
Abstract
From paddle–wheel starting material Na3Ru2(CO3)4·6H2O, a family of edge-sharing bi-octahedral (ESBO) diruthenium(IV , IV) compounds formulated as Ru2O2(CO3)2(H2O)2L2·nH2O [L = piperazine (1) or 2-methylpiperazine (2), n = 4, and L = 2,2-dimethylpiperazine (3), n = 12] and Ru2O2(CO3)2(OH)4{M(H2O)4}2·nH2O [M = Mg (4), n = 4, and Ni (5), n = 2] were prepared and structurally characterized. The Ru28+ dimer is chelated and bridged by two CO32− and two μ-O in a trans manner, and the Ru–Ru distances fall in the range 2.3808(6)–2.4001(4) Å. Compound 2 shows the shortest Ru–Ru distance for all known ESBO Ru2 compounds reported thus far. Increasing –CH3 groups of terminal piperazine ligands coordinated to the Ru(μ-O)2(μ-O3C)2Ru core, and according to Raman spectra experiments combined with theoretical calculations, the intense bands of compounds 1–3 appearing at ∼360 cm−1 can be assigned to the stretching of Ru–Ru bonds. [ABSTRACT FROM AUTHOR]