| Abstract: | Reactions of Dimethyl Sulfoxide with Molybdenum Tetrabromide and Molybdenum Dibromide Dinitrosyl. Crystal Structure of [MoBr2(NO)2(OSMe2)2] In the cold molybdenum tetrabromide reacts with an equivalent amount of dimethyl sulfoxide forming the solvate [MoBr4(OSMe2)2]; excess dimethyl sulfoxide yields [MoO2Br2(OSMe2)2] which is also obtained by other methods. Molybdenum dibromidedinitrosyl forms the solvate [MoBr2(NO)2(OSMe2)2] in the reaction with dimethyl sulfoxide. According to the i.r. spectra all complexes display O-coordination of the OSMe2 molecules. [MoBr2(NO)2(OSMe2)2] crystallizes monoclinic in the space group P21/c with four formula units per unit cell. The cell dimensions are a = 1236, b = 892, c = 1305 pm, β = 95.2°. 1662 independent observed reflexions were used for refinement; R = 3.8%. The molybdenum atoms are six-coordinated, the O atoms of the dimethyl sulfoxide molecules are in trans-position to the nitrosyl ligands, which form linear groups Mo? N? O. |
