Combining carbaboranes with transition-metal clusters; synthesis and X-ray structure analysis of a 1,2,3,4,5-pentamethyl-2,3,4,5-tetracarba-nido-hexaborane(6) derivative
Abstract
The 6-bromopentamethyl- and 1,6-dibromo-2,5-dibutyl-3,4-diethyl-2,3,4,5-tetracarba-nido-hexaboranes(6)(1 and 2) react with the tetrahedrane anion [Fe2(CO)6(µ-SN)]– 3 to form the N-{6-[2,3,4,5-tetracarba-nido-hexaborane(6)-yl]} hexacarbonyldiferraazathia tetrahedranes 4 and 5, respectively, in which two different cages are directly connected through a B–N bond; the X-ray crystal structure of 4 provides the first example of the structure of an ‘undisturbed’ 2,3,4,5-tetracarba-nido-hexaborane(6).