Preparation and characterization of the first series of molybdenum(III) ammine complexes, fac-[MoX3 (NH3)3] (X = Cl, Br, I). Spectrochemical parameters for molybdenum(III)
التفاصيل البيبلوغرافية
العنوان:
Preparation and characterization of the first series of molybdenum(III) ammine complexes, fac-[MoX3 (NH3)3] (X = Cl, Br, I). Spectrochemical parameters for molybdenum(III)
A new series of molybdenum(III) triammines fac -[MoX 3 (NH 3 ) 3 ] (X = Cl, Br, I) has conveniently been prepared by reaction of fac -[Mo(CF 3 SO 3 ) 3 (NH 3 ) 3 ] with LiX dissolved in tetrahydrofuran or ethanol. By an entirely analogous method fac -[CrBr 3 (NH 3 ) 3 ] and the already known fac -[CrCl 3 (NH3) 3 ] were prepared as well. All compounds have been characterized by UV-Vi s diffuse reflectance spectroscopy, IR spectroscopy and chemical analysis. In agreement with the mononuclear formulation, room temperature magnetic moments for members of the fac -[MoX 3 (NH 3 ) 3 ] series were near the d3 spin-only value. The combined analysis of the diffuse reflectance spectra of the fac -[MoX 3 (NH 3 ) 3 ] complexes and the solution spectra of the [MoX 6 ] 3− ions yielded the following spectrochemical parameters for molybdenum(III): Δ(NH 3 ) = 3.0 μm −1 , Δ(Cl) = 1.9 μm −1 , Δ(Br) = 1.8 μm −1 and Δ (I) = 1.4 μm −1