The known mixed halide-phosphine (or -arsine) TBP complexes of nickel(II) are blue, green, or purple. The corresponding SPY complexes are red, brown, or purple, and if the number and kind of ligands are the same in the two geometries, as in those discussed here, the lowest energy ligand-field band occurs at lower energy in the case of the TBP. When we go to the mixed cyanidearsine, however, the result is that the lowest energy absorption maximum is found in the SPY spectrum.The lowest energy band in the SPY complex is of relatively low intensity (for [Ni(diars)2CN]+, e is 420 in 2-methyl-TBP-methanol at 300°K). If we compare the most intense ligand-field bands for the two compounds, we find that for both cyanides and halides, the intense absorption at lower energy is found in the TBP.(2) This paper is based in part on a dissertation submitted by L. B. Handy to the Graduate School of the University of Wisconsin in partial fulfillment of the requirements for the Ph.D. degree, Aug 1968.

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The crystal and molecular structure of 10-phenoxarsine chloride, CisHgOAsCl, has been determined by single-crystal X-ray diffraction methods. The unit cell is monoclinic: a = 5.7596 (6) A, b ~14,641 (2) A,c -13.788 (1) A, ß = 109.80 (1)°, ámeasd = 1.71 (1) g cm-3, and

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