The reactions between benzimidazole (L 1), 4-phenylmidazole (L 2), 4-methylimidazole (L 3), 2-phenylimidazole (L 4) and ZnX 2 (X = Cl, Br, l, NO 3, ClO 4, CH 3COO, CF 3COO, CF 3SO 3 or BF 4) have been investigated. 31 novel adducts were obtained and characterized by analytical (elemental analysis and conductivity measurements) and spectral (IR, far IR and 1H NMR) data. The ligands L 1, L 2, L 3 and L 4 behave always in the monodentate N-donor fashion yielding 2:1 (L 2ZnX 2, L = L 1 and L 4), 3:1 (L 3ZnX 2, L = L 2, L 3 and L 4), 4:1 (L 4ZnX 2, L = L 1, L 2, L 3 and L 4), 5:1 ([L 5Zn]X 2; L = L 1) and 6:1 derivatives ([L 6Zn]X 2, L = L 2). The behavior of the adducts in acetone and chlorinated solvents is also discussed. Comparison has been made with related complexes of imidazoles.
On the interaction between imidazoles and zinc salts. The role of counterions and of substituents
PELLEI, Maura;PETTINARI, Claudio;CINGOLANI, Augusto;
2000-01-01
Abstract
The reactions between benzimidazole (L 1), 4-phenylmidazole (L 2), 4-methylimidazole (L 3), 2-phenylimidazole (L 4) and ZnX 2 (X = Cl, Br, l, NO 3, ClO 4, CH 3COO, CF 3COO, CF 3SO 3 or BF 4) have been investigated. 31 novel adducts were obtained and characterized by analytical (elemental analysis and conductivity measurements) and spectral (IR, far IR and 1H NMR) data. The ligands L 1, L 2, L 3 and L 4 behave always in the monodentate N-donor fashion yielding 2:1 (L 2ZnX 2, L = L 1 and L 4), 3:1 (L 3ZnX 2, L = L 2, L 3 and L 4), 4:1 (L 4ZnX 2, L = L 1, L 2, L 3 and L 4), 5:1 ([L 5Zn]X 2; L = L 1) and 6:1 derivatives ([L 6Zn]X 2, L = L 2). The behavior of the adducts in acetone and chlorinated solvents is also discussed. Comparison has been made with related complexes of imidazoles.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
