Neutral pyridylmethylamide ligands and their mononuclear copper(II) complexes |
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| Authors: | Urmila Pal Chaudhuri Lei Yang Laura R Whiteaker Arunendu Mondal Matthew R Fultz Douglas R Powell Robert P Houser |
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| Institution: | aDepartment of Chemistry and Biochemistry, University of Oklahoma, 620 Parrington Oval, Norman, OK 73019, USA |
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| Abstract: | Mononuclear copper(II) complexes of a family of pyridylmethylamide ligands HL, HLMe, HLPh, HLMe3 and HLPh3, HL = N-(2-pyridylmethyl)acetamide; HLMe = N-(2-pyridylmethyl)propionamide; HLPh = 2-phenyl-N-(2-pyridylmethyl)acetamide; HLMe3 = 2,2-dimethyl-N-(2-pyridylmethyl)propionamide; HLPh3 = 2,2,2-triphenyl-N-(2-pyridylmethyl)acetamide], were synthesized and characterized. The reaction of copper(II) salts with the pyridylmethylamide ligands yields complexes Cu(HL)2(OTf)2] (1), Cu(HLMe)2](ClO4)2 (2), Cu(HL)2Cl]2CuCl4] (3), Cu(HLMe3)2(THF)](OTf)2 (4), Cu(HLMe3)2(H2O)](ClO4)2 (5a and 5b), Cu(HLPh3)2(H2O)](ClO4)2 (6), Cu(HL)(2,2′-bipy)(H2O)](ClO4)2 (7), and Cu(HLPh)(2,2′-bipy)(H2O)](ClO4)2 (8). All complexes were fully characterized, and the X-ray structures vary from four-coordinate square-planar, to five-coordinate square-pyramidal or trigonal-bipyramidal. The neutral ligands coordinate via the pyridyl N atom and carbonyl O atom in a bidentate fashion. The spectroscopic properties are typical of mononuclear copper(II) species with similar ligand sets, and are consistent their X-ray structures. |
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| Keywords: | Copper(II) complexes Amide ligands N O ligands Bipy Coordination modes |
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