The crystal structure of the title compounds [Cu(bipy)(C204)]-2H20 (1) and [Cu(bipy)(C204) (OH2)].2H20 (2) have been determined by X-ray analysis. Compound (1) crystallises in the triclinic space group P i with a = 9.673(3), b = 8.940(3), c = 9.103(3) A, a = 105.718(3), p = 110.347(3), y = 97.539(3)', and2 = 2. The six-co-ordinate C U N ~O ~O ' ~ chromophore of (1 ) involvesan elongated rhombic octahedralstereochemistryinvolving a symmetrically co-ordinated bipy ligand (mean CU-N 2.007 A) and unsymmetrically co-ordinated bridging oxalate groups (mean Cu-0 1.988 and 2.320 A). Compound (2) crystallises in the triclinic space group Pi with a = 10.565(3), b = 7.246(3), c = 10.806(3) A, a = 102.467(3), p = 62.119(3), y = 98.134(3)", and 2 = 2. TheCuN2020' chromophore of (2) is basically square pyramidal with a symmetrically co-ordinated bipy ligand (mean CU-N 1.989 A), and a symmetrically co-ordinated oxalate group (mean Cu-0 1.953 A) in the plane of the square pyramid, and a water molecule at 2.341 A out of the plane. The electronic reflectance spectrum of (1) involves a main band at 14 500 cm-' with a resolved broad band at 9 300 cm-l, while that of (2) involves a single broad band at 15 600 cm-I, a difference that is consistent with the structures and suggests an ' electronic criterion of stereochemistry ' to distinguish these two structures.
Die als Dihydrate isolierten Titelkomplexe (I) und (II) werden aus Cu‐nitrattrihydrat und Bipyridyl in Gegenwart von K‐oxalat in wäßriger Lösung bzw. aus Cu‐oxalatsemihydrat und Bipyridyl in Acetonitril/HzO synthetisiert (keine Ausb.‐Angaben).
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