Novel bis(acylpyrazolonato)cadmium(II) derivatives and their reactivity toward aromatic and aliphatic N-2-donor ligands

By reaction of 1-phenyl-3-methyl-4-R-C(=O)-pyrazol-5-one (HQ(T): R = CH2C(C H3)(3); HQ(C): R = C6H11) with Cd(O2CCH3)(2). 2H(2)O in EtOH the derivative s [Cd(Q(T))(2)(EtOH)(2)] 1 and [Cd(Q(C))(2)(EtOH)(2)] 2 have been synthesis ed. Complex 1 has a molecular structure with a slightly distorted octahedra l coordination of the cadmium atom with EtOH and Q(T) ligands trans to each other. When the reaction between HQ(T) or HQ(C) and Cd(O2CCH3)(2). 2H(2)O was carried out in the presence of bidentate N-donor ligands L (L = 1,10-ph enanthroline, 2,2'-bipyridyl, N,N',N'-trimethylethylenediamine or tetrameth ylethylenediamine), [Cd(Q(T))(2)(L)] and [Cd(Q(C))(2)(L)] were always obtai ned. In the six-coordinate derivatives [Cd(Q(C))(2)(1,10-phenanthroline)] a nd [Cd(Q(T))(2)(tetramethylethylenediamine)] the cadmium atom is in a stron gly distorted octahedral environment due to steric requirements of the bide ntate N-2-donor ligands. All complexes synthesized have been characterized spectroscopically by IR, H-1 and Cd-113 NMR. The behavior in solution is al so discussed.