Two different crystal and molecular structures for dicarbonyl(?2-cis-cyclooctene)[?6-1,3,5-triethyl-2,4,6-tris-(trimethylsilylmethyl)-benzene]molybdenum(0): a highly crowded but surprisingly stable molecule
摘要:
Two crystal and molecular structures have been determined for the sterically very crowded molecule dicarbonyl(eta-2-cis-cyclooctene)[eta-6-1,3,5-triethyl-2,4,6-tris-(trimethylsilylmethyl)-benzene]-molybdenum(0), 3 a and 3 b. In structure 3 a the crystals are monoclinic, space group P2(1)/n, whereas in 3 b they are orthorhombic, space group P2(1)2(1)2(1). In 3 a the carbon-carbon double bond of the cis-cyclooctene moiety is almost parallel to the benzene ring plane; in 3 b it is inclined at an angle of nearly 15-degrees. In both 3 a and 3 b the co-ordinated cis-cyclooctene and arene moieties adopt conformations which are very similar to those calculated to be the ground states of the free molecules.