2,2′-Bipyridine complexes of the lithium chalcogenolates Li(EPh) and Li(NC5H4E-2) (E = S or Se)

Dilip V. Khasnis, Mihai Buretea, Thomas J. Emge, John G. Brennan

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30 Scopus citations

Abstract

2,2′-Bipyridine (bipy) forms stable crystalline co-ordination complexes with lithium benzeneselenolate and lithium pyridine-2-selenolate. The compounds are insoluble in aromatic hydrocarbons, slightly soluble in pyridine, and extremely soluble in tetrahydrofuran, from which they can be crystallized in ca. 70% yield. Both complexes have been characterized by elemental analysis, NMR, IR, and single-crystal X-ray diffraction. Compound [{Li(bipy)(SePh)}2] 1 [space group p21/m, a = 9.493(4), b = 16.866(5), c = 10.112(9), β = 114.53(6)°and Z = 4] is a dimer containing two lithium ions bridged by a pair of symmetric benzeneselenolate ligands, with bidentate bipy ligands bound to each lithium ion. In compound [{Li(bipy)(NC5H4Se-2)}2] 2 [space group P21/n, a = 10.361(5), b = 13.521(4), c = 11.062(5) Å, β = 117.21(4)°and Z = 4] each lithium ion is bound to a bidentate bipy ligand, one bridging selenium atom, and the nitrogen atom from the second bridging pyridine-2-selenolate ligand, thus forming an eight-membered Li-Se-C-N-Li-Se-C-N ring. The analogous lithium thiolates have also been prepared in 70% yield; they are not isostructural with the selenolates.

Original languageEnglish (US)
Pages (from-to)45-48
Number of pages4
JournalJournal of the Chemical Society, Dalton Transactions
Issue number1
DOIs
StatePublished - 1995

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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