Synthesis and Characterization of Macrocyclic Complexes and Their Possible Applications

Abstract

Fifteen new copper(II) and nickel(II) complexes with the composition = [CuL'(ClO4)2] (1), [CuL2(ClO4)2] (2), [CuL3(ClO4)2] (3), [NiL3](ClO4)2 (4), [CUL1- (ClO4)2] (5), [CuL (ClO4)2] (6), [NiL3](CIO4)2 (7), [CuL (ClO4)2] (8), [CuL (ClO4)2] (9), [NiL'](CIO4)2 (10), [CuL (ClO4)2] (11), [CuL3]3[Fe(CN)6]3*5H2O (12), [NiL3⁄4(4- nba)2]·H2O (13), [NiL3(4-nba)2] (14), and [NiL3(sal)2] (15), (1,3,5,7 = 3,10-dialkyl- 1,3,5,8,10,12-hexaazacyclotetradecane, L2,4,6,8 3,10-dialkyl-6,13-dimethyl-1,3,5,- 8,10,12-hexaazacyclotetradecane, 4-nba = p-nitrobenzoate, and sal = salicylate) have been synthesized and structurally studied by a combination of elemental analysis, spectroscopic techniques. The crystal structures of (5), (7), (8), (12) - (15) were determined by single crystal X-ray diffraction measurements. Complexes (5), (8), (13) - (15) displayed a distorted octahedral coordination geometry environment for the copper(II) ions (or nickel(II) ions), while the complex (7) showed square-planar geometry. Complex (12) existed as cyano-bridged bimetallic of pentanuclear CuFe2 with two different coordination modes of [Fe(CN)6]3 through the Fe-C=N-Cu linkages. In addition to, the degradation of methyl orange by potassium persulfate (KPS) in the presence of complex (13) ((14) or (15)) oxidation system was studied and found that it occurred to near completion in 60 min compared to only 55 % with KPS alone under UV light irradiation. Thus, this study showed that KPS and the complexes oxidation system could be an attractive choice for degradation of organic pollutants for environmental remediation. The complexes (3) - (10) were tested against different bacteria in vitro and were found to be potentially active in the concentration 1 mg mL1.