Edge-sharing bi-octahedral diruthenium(iv ,iv ) compounds containing Ru-Ru bonds chelated and bridged by two carbonate and two oxo groups
DALTON TRANSACTIONS（2024）
摘要
From paddle-wheel starting material Na3Ru2(CO3)(4)6H(2)O, a family of edge-sharing bi-octahedral (ESBO) diruthenium(iv,iv) compounds formulated as Ru2O2(CO3)(2)(H2O)(2)L-2nH(2)O [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)nH(2)O [M = Mg (4), n = 4, and Ni (5), n = 2] were prepared and structurally characterized. The Ru-2(8+) dimer is chelated and bridged by two CO32- and two mu-O in a trans manner, and the Ru-Ru distances fall in the range 2.3808(6)-2.4001(4) & Aring;. Compound 2 shows the shortest Ru-Ru distance for all known ESBO Ru-2 compounds reported thus far. Increasing -CH3 groups of terminal piperazine ligands coordinated to the Ru(mu-O)(2)(mu-O3C)(2)Ru core, and according to Raman spectra experiments combined with theoretical calculations, the intense bands of compounds 1-3 appearing at similar to 360 cm(-1) can be assigned to the stretching of Ru-Ru bonds.
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