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Methods for automatic structure determination [Pavel~fk (1988). Acta Cryst. A44, 724-729] have been extended by routines utilizing Patterson peaks and a new version of the XFPS computer program [Pavel-~fk, Rizzoli & Andreetti (1990). Univ. of Parma, Italy, and Komensky Univ., Bratislava, Czechoslovakia] has been developed. The results of test calculations were compared with those of SHELXS86 [Sheldrick (1986). Univ. of GSttingen, Germany]. About 80% of heavy-atom structures can be solved automatically.

Cu(C4HI6N4)][Ni(CN)4], Mr = 346'5, triclinic, Pi, a=6.460(9), b= 7.230(10), c= 7.864 (15)A, a = 106.81 (13), /3 =91"51 (14), y= 106.94 (12) °, V= 333"9 (9) A 3, Z= 1, O m = 1"71 (1), Dx=1"723Mgm -3, A(MoKa)=0-71069A, /x= Abstract. [V¢(C12H10N6)(CO)4], Mr---534.14, monoclinic, P2Jc, a=15.327(2), b=13.993(2), c= * To whom correspondence should be addressed. 0108-2701/91 / 112448-04503.00 18.526 (2)/~, fl = 114.00 (1) °, V = 3629.7 (9)/~3, Z= 8, Dx = 1.95 Mg m -3, ,~(Mo Ka) = 0.71073/~, /z = 6.535 mm-1, F(000) = 2032, T = 298 K, R (wR) = 0.023 (0.030) for 5538 unique observed reflections [I

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