The molybdenum-molybdenum triple bond. 7. Bis(1,3-di-p-tolyltriazenido)tetrakis(dimethylamido)dimolybdenum

Article abstract of DOI:10.1021/ic50215a035

Mo₂(NMe₂)₆ reacts in hydrocarbon solvents with 1,3-di-p-tolyltriazine, C₇H₈NNNHC₇H₈, to give the title compound, Mo₂(NMe₂)₄(C₇H₈N ₃C₇H₈)₂, as a red, crystalline solid. An X-ray study shows that in the solid state each molybdenum atom is coordinated to four nitrogen atoms which lie in a plane; there is an unbridged molybdenum-to-molybdenum triple bond with a Mo-Mo distance of 2.212 (1) ?, and the molecule has crystallographically imposed C₂ symmetry. Variable-temperature ¹H NMR spectra recorded at 220 MHz support the view that this form of the molecule is present in solution. These observations are compared with other findings in dimolybdenum and ditungsten chemistry. Crystal data for Mo₂(NMe₂)₄(C₇H₈N ₃C₇H₈)₂ are a = 27.529 (7) ?, b = 8.728 (2) ?, c = 18.294 (4) ?, β = 58.34 (1)°, V= 3741.58 ?³, Z = 4, d_calcd = 1.45 g cm^-3, and space group C2/c.