Accession Number : ADA181979

Title :   Cupracarboranes Containing a closo-Cu(I)C2B9 Geometry. Synthesis and Structure of ((PPh3)CuC2B9H11)- and ((PPH3)2Cu2(micro-H)2C2B9H9).

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF CHEMISTRY AND BIOCHEMISTRY

Personal Author(s) : Do,Youngkyu ; Kang,Han C ; Knobler,Carolyn B ; Hawthorne,M F

PDF Url : ADA181979

Report Date : 15 Jun 1987

Pagination or Media Count : 16

Abstract : The reaction chemistry of NIDO-7,8-Carborane(2-) with copper (I) has been examined to provide anaerobic synthetic routes to two novel Phosphinocupracarboranes, (PPh3)CuC2B9H11(-) and (PPh3)2Cu2(mu-H)2C2B9H9 d superscript 10. The structural analysis reveals that both cupracarboranes adopt a closo geometry for the d superscript 10 MC2B9 icosahedra. Two copper (I) centers of the homodi-nuclear complex are incorporated into one carboane cage via the open pentagonal C2B3 face and two B-H-Cu bridges. Both bridging BH units stem from the upper pentagonal belt resulting in the interatomic Cu(I)-Cu(I) distance of 2.576(1) A. The relatively close Cu(I)-Cu(I) proximity can be ascribed to a metal-metal interaction and the dinuclear cupracarborane can be viewed as a zwitterionic salt which upon dissolution remains intact while exhibiting fluxional behavior. The nature of these fluxional processes has been explored by variable temperature multinuclear FTNMR spectroscopy. Keywords: Crystallization.

Descriptors :   *COPPER, *CARBORANES, ANAEROBIC PROCESSES, CRYSTALLIZATION, STRUCTURAL ANALYSIS, SPECTROSCOPY, TEMPERATURE, VARIABLES, SYNTHESIS(CHEMISTRY)

Subject Categories : Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE