The molybdenum-molybdenum triple bond. 1. Hexakis(dimethylamido)dimolybdenum and some homologs: preparation, structure, and properties

Chemistry of compounds containing metal-to-metal triple bonds between molybdenum and tungsten

“…); only a trace of Mo (NR 3 ) 4 is formed in these reactions. 15 Some similar reactions involving tungsten halides and organolithium reagents are simsn~r ized in 1 through Z below. …”

Facile Access to Homo‐ and Heteroleptic, Triply Bonded Dimolybdenum Hexaalkoxides with Unsaturated Alkoxide Ligands

“…[2,21,22] In general, the protons that are closer to the axis of the MoMo triple bond are more shielded, and the protons that are equatorial to it are more deshielded. This effect, which was originally proposed in 1972 by San Filippo, [23] was first observed by means of low-temperature NMR measurements for Mo 2 (NMe 2 ) 6 [5] and resulted in a splitting of the singlet signal observed at room temperature into two different resonances for the magnetically nonequivalent methyl groups. In the present case we assume that the different resonances are a result of a change in the spatial position of the attached ligands relative to the Mo-Mo triple bond on going from the homoleptic to the heteroleptic complexes, which is due to the change in the geometric environment caused by the different adjacent ligands.…”

“…[2] Among these systems, the dinuclear, triply bonded Mo III compounds of the type Mo 2 R 6 (R = organyl) represent a fascinating group. [3] The synthesis of the first example, Mo 2 (CH 2 SiMe 3 ) 6 , as described by Wilkinson et al, [4] was extended by the seminal studies of Chisholm et al on various systems with alkyl, dialkylamino [5] and alkoxido ligands at the molybdenum atoms. [6] The latter type of complexes, i.e.…”

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

“…Mo 2 i'NMe j6 1 a..ts iL1 jydrocarbon solvents with 1,13-di-pt lyltra in 9 ,C9N)1C 7 I, to give the title comupound, MO(NMe ) 4 (C'94N 3 ._H 8 ), as a red, crystalline solid. An X-a 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 mo~onum-to-molybdenum triple .bond with a Mo-Mo distance of 2 Figure 1 and the atomic numbering scheme is shown in Figure 2.…”