New organoarsino-bridged cobalt carbonyl complexes derived from reactions of [Co2(CO)8] or [Co2(n-alkyne)(CO)6] with cych-(AsPh)6

Rohini M. De Silva, Martin J. Mays, John E. Davies, Paul R. Raithby, Moira A. Rennie, Gregory P. Shield

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Reaction of hexaphenylcyclohexaarsane (PhAs)6 with [Co2(CO)8] in toluene at ambient temperature resulted in As-As bond cleavage and the new complexes [Co4(u4-AsPh)2(CO)IO] 1 and [Co4(uj-AsPh)(u4-T|2:r|2:r|'-As4Ph4)(CO)10] 2. In contrast, reaction of c>r/o-(PhAs)6 with the alkyene-bridged complexes [Co2(u-R'C=CR2)(CO)6] in toluene or in benzene at 65 °C afforded the new complexes [Co2(u-R'GCR2){u-c>'c/0-(PhAs)6}(CO)4] (R1 = R2 = H 3; or Ph 4 and 5 (isomers); R1 = Ph, R2 = H 6; R1 = Me, R2 = H 7) in which the As6 ring remains intact. All seven products have been characterised spectroscopically and, in addition, compounds 1-4 have been structurally characterised by X-ray diffraction analysis. The molecular structure of 1 comprises a rectangle of cobalt atoms capped above and below the plane by two quadruply bridging AsPh ligands, giving a pseudooctahedral Co4As2 core. The molecular structure of 2 consists of two discrete Co2(CO)5 units linked by an As4Ph4 chain and an AsPh unit. In complexes 3-7 the six-membered As6 ring remains intact and acts as a bidentate bridging ligand replacing two equatorial carbonyl groups, one on each Co atom.

Original languageEnglish
Pages (from-to)439-446
Number of pages8
JournalJournal of the Chemical Society - Dalton Transactions
Issue number3
DOIs
Publication statusPublished - 1998

ASJC Scopus subject areas

  • Chemistry(all)

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