MOLECULAR AND CRYSTAL-STRUCTURE OF THE REACTION-PRODUCT OF DODECAHYDRO-7,8-DICARBA-NIDO-UNDECABORAT(1-) WITH 4-METHYLPYRIDINE, C2B9H11(NC5H4ME)

The title compound has been studied by an X-ray structure analysis (a CAD-4 diffractometer, lambdaMoK(alpha), graphite monochromator, omega/ 2theta scan, 2theta(max) = 50-degrees, direct methods, 884 reflections , R = 0.0416). The crystals are orthorhombic with a = 20.326, b = 8.82 8, c = 7.3872 angstrom, V = 1325.6 angstrom3, and Z = 4. C8H18B9N, spa ce group Pnam, d(calc) = 1.130 g/cm3, d(exp) = 1.130 g/cm3. The compou nd is a molecular complex. The main feature of its crystal structure i s the coexistence of two asymmetric mirror isomers which have the same pyridine cycle and the same atoms of the carborane skeleton (excludin g C7, H7C, and H34). The methyl group has a disordered orientation in two positions. The complexes are linked by van der Waals interactions.