STERIC EFFECTS IN HETEROBORANES .8. STERICALLY-INDUCED EXO-SKELETAL ISOMERIZATION OF DI-COPPER CARBAMETALLABORANES - SYNTHESES AND CRYSTAL-STRUCTURES OF (PH(3)PCU)(2)PH(2)C(2)B(9)H(9) AND ((O-TOL)(3)PCU)(2)PH(2)C(2)B9H9

Authors
ADAMS KJ COWIE J HENDERSON SGD MCCORMICK GJ WELCH AJ
Citation
Kj. Adams et al., STERIC EFFECTS IN HETEROBORANES .8. STERICALLY-INDUCED EXO-SKELETAL ISOMERIZATION OF DI-COPPER CARBAMETALLABORANES - SYNTHESES AND CRYSTAL-STRUCTURES OF (PH(3)PCU)(2)PH(2)C(2)B(9)H(9) AND ((O-TOL)(3)PCU)(2)PH(2)C(2)B9H9, Journal of organometallic chemistry, 481(2), 1994, pp. 9-11
Citations number
14
Categorie Soggetti
Chemistry Inorganic & Nuclear","Chemistry Inorganic & Nuclear
Journal title
Journal of organometallic chemistry → ACNP
ISSN journal
0022328X
Volume
481
Issue
2
Year of publication
1994
Pages
9 - 11
Database
ISI
SICI code
0022-328X(1994)481:2<9:SEIH.S>2.0.ZU;2-8
Abstract
In (Ph(3)PCu)(2)Ph(2)C(2)B(9)H(9) (Ia) and {(o-tol)(3)PCu}(2)Ph(2)C(2) B(9)H(9) (Ic) one copper atom occupies a polyhedral vertex position bu t is slipped away from the cage carbon atoms (the latter the more so) to relieve phosphine ... C-cage-phenyl crowding. The second copper ato m is exo-facially bonded to the B(8)B(9)B(12) triangular face, in cont rast to the situation in (Ph(3)PCu)(2)C2B9H11, where the exo-metal cap s the Cu(3)B(4)B(8) triangle. Compounds Ia, Ic and the related species (Cy(3)PCu)(2)Ph(2)C(2)B(9)H(9) (Ib) display fluxionality in solution at room temperature that renders equivalent the two phosphorus nuclei. It is speculated that this fluxional process involves a unique bis(ex o-metal) nido carbaborane.