Synthesis, characterization and crystal structure of a novel thiazoline/thiazolidine azine ligand and its nickel, copper and zinc complexes

Synthesis, characterization and molecular structures of Ni(II) complexes derived from Schiff base pyridylimine ligands

“…The NiL1 (15) Å] is close to those observed in other aqua nickel complexes [17,18,[25][26][27][28][29][30][31], lengths for Ni-N imine and Ni-N pyridyl bonds are in accordance with other structurally similar complexes [15,[17][18][19]32,33].…”

Effects of a derivative thiazoline/thiazolidine azine ligand and its cadmium complexes on phagocytic activity by human neutrophils

“…The analysis of bond lengths N(3)-C(6) and C(6)-N(4) in complexes 1 and 2 shows that the organic ligand presents an amino-2-thiazoline form instead of the iminothiazolidine one observed in ATHTd in the free state [24]. This fact does not allow the coordination of two azine nitrogen atoms from ATHTd, differently to what it happens in other azine complexes [50] where azine ligand bridges two metal ions.…”

“…Thus, in the IR spectra of the complexes 1 and 2 relevant bands appear at 1597 (thiazoline rings [24]. It can be observed that in both complexes the aforementioned bands suffer a positive shift when compared with those for the uncoordinated ligand.…”

“…N-(2-acetyl-2-thiazoline)-N 0 -(2-thiazolidin-2-one) azine (ATHTd) was synthesized according to the method reported elsewhere [24]. Chemical analyses of carbon, hydrogen, nitrogen and sulfur were performed by microanalytical methods using a Leco CHNS-932 microanalyser.…”

“…Another difference in complexes with respect to the structure of free ligand ATHTd is due to the different degree of rotation of the thiazoline rings around the C(1)-C(4) bond, which permits the coordination through thiazoline nitrogen atom N(1) [torsion angle S(1)-C(1)-C(4)-N(2) = À179.7°in 1, 172.4°in 2, À2.2°in ATHTd]. In the same way, as a result of the thiazoline form present in the coordinated ligand a rotation around C(6)-N(3) bond is now possible to permit the coordination through nitrogen atom N(4) [torsion angle S(2)-C(6)-N(3)-N(2) = 177.5°in 1, À175.0°in 2, 0.2°in ATHTd] [24].…”