CRYSTAL-STRUCTURES OF NICKEL(II) AND COPPER(II) SCHIFF-BASES COMPLEXES WITH TETRAMIC AND TETRONIC ACID SUBUNITS

ne-bis-(tetronic-acid-3-formiminato)-copper(II)/K1 crystallizes in spa ce group P2(1)/n: C12H10CuN2O(6) x H2O; a = 8.439(5) Angstrom; b = 12. 762(1) Angstrom; c = 12.582(1) Angstrom; beta = 99.02(3)degrees; V = 1 338.3 Angstrom(3); Z = 4; D-x = 1.783 gcm(-3); MoKalpha = 0.71069 Angs trom; mu = 16.71 cm(-1); F(000) = 732; T = 293 K; Conventional R = 0.0 37; R(w) = 0.040 for 1633 observed reflections. e-bis-(tetronic-acid-3 -formiminato)-nikkel(II))/K2 crystallizes in space group C2/c: C12H10N 2O6Ni x 4 H2O; a = 20.232(5) Angstrom; b = 12.983(5) Angstrom; c = 14. 038(10) Angstrom; beta = 120.01(3)degrees; V = 3193.0 Angstrom(3); Z = 8; D-x = 1.702 gcm(-3); MoKalpha = 0.71069 Angstrom; mu = 12.74 cm(-1 ); F(000) = 1696; T = 293 K; Conventional R = 0.087; R(w) = 0.090 for 2877 observed reflections. N,N'-ethylene-bis- rimethyltetramic-acid-3- formiminato)-copper(II)/K3 crystallizes in space group P2(1)/n: C18H24 N4O4Cu x 1 H2O; a = 15.981(9)Angstrom; b = 7.293(8) Angstrom; c = 18.7 42(4) Angstrom; beta = 114.06(4)degrees; V = 1994 Angstrom(3); Z = 4; D-x = 1.472 gcm(-3); MoKalpha = 0.71069 Angstrom; mu = 11.31 cm(-1); F (000) = 924; T = 293 K; Conventional R = 0.129; R(w) = 0.142 for 2900 observed reflections. In K1 and K3 copper is coordinated by two nitrog en and two oxygen atoms of the ligand molecule as well as by one water molecule on top of a tetragonal pyramid. In K2 two water molecules ar e included in the complex formation. These and two nitrogen as well as two oxygen ligand atoms form a nearly regular octahedron.