Cobalt(II) complexes with trimethylphosphine selenide

Abstract
Spectrochemical and magnetic data are presented for cobalt(II) complexes of trimethylphosphine selenide, CoL4(ClO4)2 and CoL2X2(X = Cl, Br, or I), and comparisons made with the trimethylphosphine oxide and sulphide analogues. The Δ value for the [CoL4] selenide is similar to that for the corresponding sulphide, but there is a slight decrease in β. Within each of the halide series, on the other hand Δ falls as L varies from phosphine oxide to phosphine selenide, while β shows lesser variation. The metal–selenium stretching frequency has been assigned. Some comparative results for nickel and zinc complexes are included.

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