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Title: Magnetic and spectral properties of adducts of copper(II) chlorobenzoates with substituted piperazines
Authors: Manhas, B S
Kalia, S B
Sardana, A K
Lumba, K
Issue Date: Aug-2007
Publisher: CSIR
Abstract: Adducts of Cu(OOCR)2 (where R = 2-, 3- or 4-ClC₆H₄) with saturated substituted piperazines of the type Cu(OOCR) ₂(L-L)ո [where n = 0.5 or 1 and L-L = 1-methylpiperazine (1-MePipz), 1,4-dimethylpiperazine (1,4-Me₂Pipz), 2,6-dimethylpiperazine (2,6-Me2Pipz) and 1-phenylpiperazine (1-PhPipz)] have been prepared and characterized by elemental analysis, infrared, electronic reflectance, electron paramagnetic resonance spectral and magnetic moment studies. Three complexes which have room temperature magnetic moment values lower than the spin only values and have room temperature electron paramagnetic resonance spectra corresponding to S = 1, rather than S = 1/2, have been further subjected to magnetic susceptibility and electron paramagnetic resonance spectral measurements at different temperatures to evaluate spin-exchange parameter (-2J = 282-313 cm⁻¹). Based upon the above studies, axially symmetric binuclear structure for complexes of the type Cu(OOCR)2(L-L), polymeric structure containing binuclear units for the Cu(OOCR)₂(L-L)₀․₅ complexes and axially symmetric polymeric square pyramidal or trans-pseudo octahedral structure for complexes of the type Cu(OOCR)₂(2,6-Me₂Pipz) (R = 2-, 3- and 4-ClC6H4), have been proposed.
Page(s): 1226-1232
ISSN: 0376-4710
Appears in Collections:IJC-A Vol.46A(08) [August 2007]

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