Abstract

Trans-[Mo 2(μ-O 2CCH 3) 2Cl 2(μ-dppma) 2] ( 2) can be synthesized from Mo 2(μ-O 2CCH 3) 4 ( 1), trimethylchlorosilane and bis(diphenylphosphino)methylamine (dppma) ( 3) at room temperature. In contrast to the related compounds containing dppa (bis(diphenylphosphino)amine) this molecule displays significant torsion angles in both the acetato and the diphosphine ligands and significantly shorter MoCl bond distances. These differences are also reflected in the spectroscopic data. Crystallographic data for 2 are as follows: I2 ( No. 5), a = 13.056(3), b = 14.814(4), c = 14.954(4) A ̊ , β = 100.76(1)°, V = 2841(1) A ̊ 3 , Z = 2.d( MoMo) = 2.172(1) A ̊ . For comparison with compound 2 the free ligand, dppma ( 3), was also examined by X-ray crystallography. Crystallographic data are as follows: Pna2 1 (No. 33), a = 13.5061(2), b = 14.3943(2), c = 11.231(3) A ̊ , V = 2183.5(5) A ̊ 3, Z = 4 .

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