STRUCTURES OF (DIETHYL 2-[(8-HYDROXY-KAPPA-O-2-QUINOLYL-KAPPA-N)METHYL]MALONATO(2-)-KAPPA-C-2)(PYRIDINE)PALLADIUM(II) AND THE ANALOGOUS ETHYL COMPLEX

{Diethyl 2-[(8-hydroXy-kappaO-2-quinolyl-kappaN)-methyl]malonato(2-)-kappaC}(pyridine)palladium(II) dihydrate, [Pd(C17H17NO5)(C5H5N)].2H2O (1), M(r) 536.82, triclinic, P1BAR, a = 11.674 (1), b = 11.740 (3), c = 10.863 (3) angstrom, alpha = 128.34 (2), beta = 91.93 (1), gamma = 97.18 (2)-degrees, V = 1146.7(8)A-degrees, Z = 2, D(m) = 1.441, D(x) = 1.555 g cm-3, lambda(Mo Kalpha) = 0.7107 angstrom, mu = 8.4 cm-1, F(000) = 548, T = 295 K, final R = 0.033 for 4922 independent reflections having \F(o)\ > sigma(F(o)). {Diethyl 2-[(8-hydroXy-kappaO-2-quinolyl-kappaN)ethyl]malonato(2-)-kappaC}(pyridine)palladium(II), [Pd(Cl8H19NO5)(C5H5N)] (2), M(r) = 514.85, monoclinic, P2(1)/n, a = 19.349(2), b = 7.544(2), c = 14.826 (2) angstrom, beta = 94.11 (1)-degrees, V = 2158.6 (5) angstrom3, Z = 4, D(m) = 1.624, D(x) = 1.585 g cm-3, lambda(Mo Kalpha) = 0.7107 angstrom, mu = 8.8 cm-1, F(000) = 1048, T = 295 K, final R = 0.034 for 4459 independent reflections having \F(o)\ > sigma(F(o)). The structures of the two molecules are characterized by 5,5- and 5,6-bicyclic chelating systems originating from novel quinolinol ligands containing three donor sites (C, N and O atoms). Some distortions are observed in the square-planar coordination geometry and are assumed to be due to the bicyclic chelating systems. Pd-N(pyridine) bond lengths are practically identical [2.049 (3) and 2.053 (3) angstrom], whereas other Pd-N lengths are significantly different [1.938 (3) and 2.032 (3) angstrom]. It is confirmed that the radical C(15) atom in the 2-substituted group acts as a donor and constructs a stable Pd-C(sp3) sigma bond.