SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF A ZWITTERIONIC TRIPHENYLPHOSPHINE DERIVATIVE OF THE DICARBOLLIDE ANION - [NIDO-9-P(C6H5)3-7,8-C2B9H11] - KIM, KM; DO, YK; KNOBLER, CB; HAWTHORNE, MF (KOREAN CHEMICAL SOC, 1989)