36-Nuclear Co and Ni dimethylmalonate complexes with the [K(18-crown-6)]+ cationic fragments: synthesis and structure.

Autor:	Zorina-Tikhonova, E., Gogoleva, N., Sidorov, A., Kiskin, M., Eremenko, I.
Předmět:	POTASSIUM compounds COBALT compounds synthesis NICKEL compounds synthesis MALONATES POLYCYCLIC compounds CROWN compounds X-ray diffraction
Zdroj:	Russian Chemical Bulletin; Mar2015, Vol. 64 Issue 3, p636-641, 6p
Abstrakt:	A reaction of potassium dimethylmalonate (KMeMal) with cobalt(II) or nickel(II) trimethylacetate in the presence of 18-crown-6 leads to the formation of 36-nuclear complexes {[K(18-crown-6)][K(HO)(18-crown-6)][KCo(HO)(OH)(MeMal)(18-crown6)(O)]• xHO} ( 2) and {[K(HO)(18-crown-6)][KNi(HO)(OH)(18-crown-6)(MeMal)(HMeMal)][KNi(HO)(OH)(18-crown-6)(MeMal)(HMeMal)]• •80HO} ( 3) (MeMal is the dianion of dimethylmalonic acid), respectively. The single crystal X-ray diffraction studies showed that the spherical 36-nuclear polyanions [Co(HO)(OH)(MeMal)(O)] (in compound 2) and [Ni(HO)(OH)(MeMal)(HMeMal)] (in compound 3; x = 1, y = 7; x = 2, y = 6) have similar structures, with their metal cores being formed of two layers: an internal one comprising 24 metal atoms and an external containing 12 metal centers. The inner cavity of the {M} anions was found to include one K aqua cation bonded to the oxygen atoms of the carboxylate or oxo ligands. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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