Synthesis and structures of two thiocyanato-lanthanoid cages

Bakker, Jacinta M.;Deacon, Glen B.;Junk, Peter C.

Abstract

The cages [{La2(NCS)5(NCMe)6}2O]·MeCN and [{Eu2(NCS)5(NCMe)5}2O]·MeCN have been prepared by redox transmetallation between the lanthanoid metals and mercuric thiocyanate in acetonitrile. The structure of the former has a core of four La atoms bonded to a central oxygen atom. Two La atoms are nine coordinate being bonded to oxygen, four terminal MeCN ligands and four N-bridged thiocyanato ligands, whereas the other two are eight coordinate being bonded to oxygen, the four bridging thiocyanato ligands, two terminal acetonitrile molecules, and a terminal N-bonded thiocyanate ion. In the Eu complex, there is a similar core of four Ln atoms bound to a central oxygen atom, but all Eu atoms are eight coordinate, and have four N-bridged thiocyanate ligands. Two have three MeCN ligands, whilst the other two have one terminal NCS− and two acetonitrile ligands.

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1572-8862

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Springer

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10.1007/s10876-010-0317-7