Abstract
The semirigid tridentate 8-(2-pyridinylmethylthio)quinoline ligand (Q1) forms the structurally characterized transition metal complexes Cu(Q1)Cl2 (1), Co(Q1)(NO3)2 (2), Cd(Q1)(NO3)2 (3), Cd(Q1)I2 (4), Cu(Q1)2(BF4)2·(H2O)2 (5), Cu(Q1)2(ClO4)2·(CH3COCH3)2 (6), Zn(Q1)2(ClO4)2 (7), Cd2(Q1)2Br4 (8), Ag2(Q1)2(ClO4)2 (9), and Ag2(Q1)2(NO3)2 (10). Four types of structures were obsd.: ML-type in complexes 1-4, in which the anions Cl-, NO3- or I- also participate in the coordination; ML2- type in complexes 5-7 without direct coordination of the anions BF4- or ClO4- and with more (Cu2+) or less (Zn2+) distorted bis-fac coordinated Q1; M2L2-type in complex 8, in which two Br- ions act as bridges between two metal ions; and M2(m-L)2-type in complexes 9 and 10, in which the ligand bridges two anion binding and Ag-Ag bonded ions. Depending on electron configuration and size, different coordination patterns are obsd. with the bonds from the metal ions to Npyridyl longer or shorter than those to Nquinoline. Typically Q1 acts as a facially coordinating tridentate chelate ligand except for the compds. 9 and 10 with low-coordinate Ag(I). Except for 6 and 8, the complexes exhibit distinct constraining effects against both G(+) and G(-) bacteria. Complexes 1, 3, 4, 5, 7 have considerable antifungal activities and complexes 1, 5, 7, and 10 show selective effects to restrain certain botanic bacteria. Electrochem. studies show quasi-reversible redn. behavior for the Cu(II) complexes 1, 5 and 6. on SciFinder(R)
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