Copper(II) complexes derived from bidentate N,O-ligands for catalytic aerobic oxidation
摘要:
Two Cu-II complexes based on bidentate N,O-ligands have been synthesized and structurally characterized. X-ray structural analysis revealed that in complex 1 the Cu-II center adopts an unusual near tetrahedral coordination geometry, while the Cu-II core in 2 is traditionally square planar, albeit both of them have a N2O2 coordination environment and two compounds are mononuclear bis-ligand neutral complexes. A two-dimensional sheet-like network was observed in 2, resulting from the weak Cu center dot center dot center dot O contacts between the nitrato groups and axial Cu-II sites. Both complexes were tested for catalytic aerobic oxidation of benzylic alcohol and the results indicated that 2 was a better catalyst than 1. High yield of benzaldehyde was observed when using 2 as a catalyst in combination with TEMPO in an aqueous potassium carbonate solution at 60 degrees C. (C) 2014 Elsevier B.V. All rights reserved.
Theoretical and experimental studies on the fluorescence properties of aluminum(III), cadmium(II), zinc(II), and copper(II) complexes of substituted 8-hydroxyquinoline
Fifty-five 8-hydroxyquinoline (8-HQ) derivatives are synthesized and the corresponding aluminum(III), cadmium(II), copper(II), and zinc(II) metal complexes are prepared and their fluorescent activi...