Crystal engineering with heteroboranes. II. 1,2-Dicarboxy-1,2-dicarba-closo-dodecaborane(12) ethanol hemisolvate
Abstract
The title compound, 1,2-(COOH)2-1,2-closo-C2B10H10·0.5C2H6O or C4H12B10O4·0.5C2H6O, forms a tetramer by incorporating ethanol (solvent) molecules through hydrogen bonding. Two eight-membered rings [graph set R(8)] are formed by hydrogen bonding between two carboxylic acid groups, whereas two ten-membered rings [R(10)] are formed by hydrogen bonding between two carboxylic acid groups and the OH group of an ethanol molecule (solvent). Two crystallographically independent tetramers are present in the crystal structure.