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Bis(alkylamino)-3-cyclobuten-l,2-dithiones (cis-dithiosquaramides, LH2) react with divalent metal acetates to give neutral 2:1 complexes of the general formula M'^LH^xIUO (M11 = Ni, Cu, Pd). The ligands bind in a didentate S2 fashion forming a square planar MnS4 coordination sphere. Spectral data suggest that complexation localizes the ligand's electronic structure into a more dithiolene-ndiimine-like form, and the crystal structure of Pd(dcy-DTSQ)2'2H20 (dcy-DTSQ = 3,4-bis(cyclohexylamino)-3-cyclobuten-1,2-dithionato ligand) provides further evidence to support this suggestion. The compound Pd(dcy-DTSQ)2'2H20 crystallizes in the monoclinic space group P2\/a (No. 14) with cell dimensions a = 10.222 (3) Á, b = 16.015 (3) A, c = 11.664 (1) A, ß = 110.25 (1)°, and V= 1791.4 (7) A* 123. For Z = 2 and a formula weight = 757.42, the calculated density is 1.403 g/cm3. Diffraction data (Cu Ka) were collected with a Rigaku AFC5R diffractometer at 21 eC, and the structure was solved by direct methods. The agreement factors were R = 0.030 and Rv = 0.044 for the 2076 observed reflections.

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