The electronic properties and stereochemistry of the copper(II) ion—VIII

catena-Acetato(di-2-pyridylamine)-μ-perchlorato-copper(II) monohydrate

“…The chains of [Cu(dpyam)(CH3CO2)(ClO4)] are linked by the uncoordinated water molecule into an infinite threedimensional structure via some short non-bonded distances O(7)...N(3) 2.828(5) and O(7)...O(2 i) 2.847 (5) ,/~. The electronic reflectance spectrum of (1) involves a broad peak at 15 820 cm -~ with a weakly resolved shoulder at ca 10000 cm -~ (Procter, Hathaway & Hodgson, 1972), and the polycrystalline ESR spectrum is axial, g~ = 2.074 and g~ = 2.284. The single-crystal ESR spectrum of (1) yields three g factors 2.053, 2.065 and 2.274, but as the CuN20 2 plane is slightly misaligned by the monoclinic twofold axis, these crystal g factors cannot be unambiguously resolved into their local molecular g factors.…”

Complexation, Spectroscopic, Thermal, Magnetic And Conductimetric Studies On Some 8-(Arylazo)Coumarins With Divalent Transition Metal Ions

“…or interligand transitions within the ligands. The electronic absorption spectra of Mn(II), Ni(II) and Cu(II) metal ions with the investigated ligands (L1 and L2) (1:1) and (1:2) complexes exhibit two absorption bands at 220 nm (45454 cm -1 ), 330 nm (30303 cm -1 ) and a shoulder at 470 nm (21276 cm -1 ) may be attributed to charge transfer 2 A 2g  2 T 1g transitions and an octahedral configuration was suggested around the central metal ion [19,20]. For Co(II), these bands are typical for six-coordinate high-spin cobalt (II) complexes.…”

DNA interaction of some polymer–copper(II) complexes containing 2,2′-bipyridyl ligand and their antimicrobial activities

“…Milli-Q water was used to prepare the solutions. The complex, [Cu(bpy) 2 Cl 2 ], was prepared as reported earlier in the literature [20].…”