Synthesis, isolation, and characterization of trisodium tricarbonyliridate (3-), Na3[Ir(CO)3]. Initial studies on its derivative chemistry and structural characterizations of trans-[Ir(CO)3(EPh3)2]-, E = Ge, Sn, and trans-[Co(CO)3(SnPh3)2]-

J. M. Allen, W. W. Brennessel, C. E. Buss, John E Ellis, M. E. Minyaev, M. Pink, G. F. Warnock, M. L. Winzenburg, Victor G Young

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24 Scopus citations

Abstract

Reduction of Na[Ir(CO)4] by sodium metal in (Me2N)3PO, followed by treatment with liquid ammonia, provided high yields (ca. 90%) of unsolvated Na3[Ir(CO)3], a thermally stable, pyrophoric orange solid. This substance contains iridium in its lowest known formal oxidation state of -3 and has been characterized by IR spectroscopy, elemental analyses, and derivative chemistry, i.e., by its conversion to the triphenylgermyl and triphenylstannyl complexes, trans-[Ir(CO)3(EPh3)2]-, E = Ge, Sn. Single-crystal X-ray structures of the tetraethylammonium salts of these species, as well as [Co(CO)3(SnPh3)2]-, confirm the trigonal bipyramidal nature of the anions, originally predicted on the basis of their IR spectra in the carbonyl stretching frequency region. These structural characterizations provide important additional evidence for the presence of metal tricarbonyl units in Na3[M(CO)3], M = Co, Ir.

Original languageEnglish (US)
Pages (from-to)5279-5284
Number of pages6
JournalInorganic Chemistry
Volume40
Issue number20
DOIs
StatePublished - Sep 24 2001

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