title: Dynamic Permutational Isomerism in a closo-Cluster.
abstract: Permutational isomers of trigonal bipyramidal [W2RhIr2(CO)9(η(5)-C5H5)2(η(5)-C5HMe4)] result from competitive capping of either a W2Ir or a WIr2 face of the tetrahedral cluster [W2Ir2(CO)10(η(5)-C5 H5)2] from its reaction with [Rh(CO)2(η(5)-C5HMe4)]. The permutational isomers slowly interconvert in solution by a cluster metal vertex exchange that is proposed to proceed by Rh-Ir and Rh-W bond cleavage and reformation, and via the intermediacy of an edge-bridged tetrahedral transition state. The permutational isomers display differing chemical and physical properties: replacement of CO by PPh3 occurs at one permutational isomer only, while the isomers display distinct optical power limiting behavior.
authors: Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.
authors: Junhong
authors: J
authors: Fu
authors: Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.
authors: Mahbod
authors: M
authors: Morshedi
authors: Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.
authors: Graeme J
authors: GJ
authors: Moxey
authors: Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.
authors: Adam
authors: A
authors: Barlow
authors: Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.
authors: Marie P
authors: MP
authors: Cifuentes
authors: Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia. Mark.Humphrey@anu.edu.au.
authors: Mark G
authors: http://orcid.org/0000-0002-4433-6783
authors: MG
authors: Humphrey
keywords: carbonyl ligands; cluster compounds; heterometallic complexes; isomers; transition metals