96041-34-8Relevant articles and documents
Dinuclear aryloxide chemistry. 3. Synthesis, structure, and fluxional behavior of 1,2-bis(2-tert-butyl-6-methylphenoxy)tetrakis(dimethylamido)dimolybdenum and -ditungsten (M≡M)
Coffindaffer, Timothy W.,Rothwell, Ian P.,Huffmann, John C.
, p. 1643 - 1646 (2008/10/08)
Addition of 2-tert-butyl-6-methylphenol (HOAr) to the dinuclear compounds M2(NMe2)6 (M = Mo, W) results in the formation of the complexes 1,2-M2(OAr)2(NMe2)4 [M = Mo (1), W (2)] as yellow crystalline solids. Spectra are consistent with the presence in solution of the gauche rotamer for these complexes, and variable-temperature studies allow the activation energy for restricted rotation about the M-NMe2 bonds to be estimated. A single-crsytal X-ray diffraction study of 1 shows that in the solid state the gauche rotamer is maintained for the unbridged Mo2O2N4 skeleton. Crystal data at -160°C were a = 13.532 (4) A?, b = 16.634 (6) A?, c = 14.696 (10) A?, Z = 4, and dcalcd = 1.369 g cm-3 for space group P212121. The metal-metal distance of 2.2198 (14) A? is consistent with the retention of a Mo-Mo triple bond while the Mo-NMe2 distances of 1.925-1.97 A? indicate the presence of considerable nitrogen p to metal d π bonding.
