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- W1969116396 abstract "Mixed-ligand N-(2-pyridylethyl)picolinamidocopper(II) complexes, Cu(pepa)(L)(H2O)n(ClO4) [pepa = N-(2-pyridylethyl)picolinamide anion; L = imidazole (n = 0), N-methylimidazole (n = 1), 2-methylimidazole (n = 1), 4-methylimidazole (4MImH, n = 2), 3-methylpyridine (3Mpy, n= 1 and 2), and 4-methylpyridine (4Mpy, n = 1 and 2)], have been synthesized and characterized by elemental analyses, and electronic, vibrational and EPR spectroscopic measurements. Molecular structures of [Cu(pepa)(3Mpy)(H2O)](ClO4) (1), [Cu(pepa)(4Mpy)(H2O)](ClO4) (2) and [Cu(pepa)(4MImH)(H2O)(ClO4) (3) have been determined by X-ray diffraction methods. The structures of these complexes are square pyramidal with the pepa and a heterocyclic unidentate ligand forming the basal plane and an H2O molecule on the apical position. The dihedral angles of the heterocyclic unidentate nucleus and the CuN4 basal plane are 74.3° for 1, 66.8° for 2 and 77.7° for 3. The structures of other pepa complexes are suggested to be square pyramidal based on their spectroscopic data. The sequence of d orbitals was assigned as dx2−y2 ⪢ dz2 > dyz > dxy > dxz for the square pyramidal complexes. The significant rise in energy of the dyz orbital suggests that the central amido of the pepa ligand is a strong π-donor." @default.
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- W1969116396 date "1997-01-01" @default.
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- W1969116396 title "Electronic and bonding properties of mixed-ligand copper(II) complexes of N-(2-pyridylethyl)picolinamide (pepa). Molecular structures of [Cu(pepa)(3-methyl-pyridine) (H2O)](ClO4), [Cu(pepa)(4-methylpyridine) (H2O)](ClO4) and [Cu(pepa)(4-methylimidazole) (H2O)](H2O)(ClO4)" @default.
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- W1969116396 doi "https://doi.org/10.1016/s0277-5387(96)00569-4" @default.
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