The crystal structure of [Co(NH3)5C1]CI2 has been redetermined from three-dimensional counter data at room temperature. The crystals are orthorhombic (Pnma) with lattice constants a = 13.26, b = 10.34, both + 0.01, and c= 6-72_+ 0.005 ,~. The structure is made up of molecular ions, Co(NH3)sCI2+ and C1-ions, separated by ordinary van der Waals distances. There is no evidence for a trans distortion of the Co-N bond by the Co-Cl bond. The four independent Co-N distances were found to be: 1"962_ 0.004, 1.964 + 0.006, 1.978 _ 0.006 and 1"998_+ 0.006/~. The nitrogen associated with the longest Co-N distance appears to be involved in a N-CI intermolecular hydrogen bond.

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The crystal structure of bis(triphenylphosphine)copper(I) nitrate has been determined by a three-dimensional X-ray diffraction study. The copper(I) atom is bonded to the two phosphines and two oxygen atoms of the nitrate group. However, the molecule is distorted from that of an ideal tetrahedron, with the P—Cu—P angle being 131.1°.