Boron Vertices Research Articles

Preparation of [(C5Me5)2Rh2B17H19]via a degradative insertion from anti-B18H22, and a possible mechanism for anti→syn macropolyhedral interconversion

Reaction of [(C5Me5)RhCl2]2 with anti-B18H22 in the presence of base yields, via boron vertex loss, a 19-vertex dirhodanonadecaborane [(C5Me5)2Rh2B17H19] of which the structure has been confirmed by X-ray crystallography; it comprises a 12-vertex nido{RhB11} subcluster and a 10-vertex nido{5-RhB9} subcluster conjoined with a common triangular {B3} face so as to generate an effective syn configuration.

A convenient preparation of 1-CB11H12- and its C-amino derivatives

Treatment of 7-(CH3)3N-7-CB10H12 with triethylamineborane(3) at 180-200 °C proceeds under splitting off one methyl group and inserting one boron vertex to obtain 1-(CH3)2NH-1-CB11H11. Methylation of the latter compound produces 1-(CH3)3N-1-CB11H11 which can be reduced to the parent 1-CB11H12- anion with sodium in liquid ammonia. The constitution of all compounds was established by NMR and mass spectroscopy.

Structures of metallocarboranes. III. Crystal and molecular structure of the bimetallocarborane complex 2,3-di-.eta.-cyclopentadienyl-1,7-dicarba-2,3-dicobaltadodecaborane(10), (.eta.-C5H5)2CO2C2B8H10

Abstract : The crystal and molecular structure of 2,3-(eta-C5H5)2-2,3-Co2-1,7-C2B8H10 has been determined by a complete three-dimensional X-ray diffraction study. The compound crystallizes in the monoclinic centro-symmetric space group. The molecule can be described as a distorted icosahedron comprised of two cobalt, two carbon, and eight boron vertices. (Modified author abstract)