CRYSTAL-STRUCTURE AND VIBRATIONAL-SPECTRA OF POLYAMINE-COPPER(II) COMPLEXES

The structures of [Cu(en)(H2O)(2)]SO4 (I), [Cu(en)(2)](NO3)(2) (II) an d [Cu(trien)I]I (III) have been determined by single crystal X-ray dif fraction. Complex I is monoclinic, space group C2/c, with unit cell pa rameters a = 7.232(1), b = 11.725(2), c = 9.768(1), beta = 105.50(1)de grees, and Z = 4. Complex II is also monoclinic, space group P2(1)/a, with a = 7.978(2), b = 9.982(4), 8.218(3), beta = 111.11(2)degrees, an d Z = 2. Complex III is orthorhombic, space group P2(1)2(1)2(1), with a = 8.098(1), b = 11.902(1), c = 13.682(2), and Z = 4. The structures were solved by direct methods and refined by full-matrix least-squares to final R values of 0.031, 0.043 and 0.036 for complexes I, II, and III, respectively. Complexes I and II show an octahedral coordination geometry. Complex III shows a square pyramidal coordination geometry. Complex I forms infinite monodimensional chains where the SO42- ions a cts as a bridge between two neighboring en molecules. The vibrational spectra of these complexes agree well with their crystal structures. S tructure and stability of seven other related Cu(II) complexes of (tri en), (dien)(2), (en)(2) and (en) are inferred in this study.