Spectroscopic studies on bis(1-amidino-O-alkylurea) copper(II) sulfate complexes where alkyl = methyl,ethyl, n-propyl or n-butyl: EPR evidence for binuclear complexes |
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| Authors: | L Jaideva Singh N Shantibala Devi S Pramodini Devi W Bembee Devi RK Hemakumar Singh B Rajeswari RM Kadam |
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| Affiliation: | 1. Department of Chemistry, Manipur University, Imphal 795 003, India;2. Radiochemistry Division, BARC, Mumbai 400 085, India |
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| Abstract: | Four new Cu(II) Complexes viz. Cu(II)(1-amidino-O-methylurea)2]SO4·2H2O (1), Cu(II)(1-amidino-O-ethylurea)2](SO4)2·2H2O (2), Cu(II)(1-amidino-O-n-propylurea)2] SO4·2H2O (3), Cu(II)(1-amidino-O-n-butylurea)2]2(SO4)2·2H2O (4) have been synthesized and characterized. EPR spectrum of complex 4 at RT consisted of fine-structure transitions (ΔMs = ±1) with zero-field splitting (ZFS) of 0.0485 cm?1 and a half-field signal (ΔMs = ±2) at ca. 1600 G, revealed formation of binuclear complex (S = 1). Whereas EPR spectrum of complex 2 in DMSO showed a mixture of mononuclear and binuclear complex in the ratio 0.75:1.0 with ZFS of 0.0385 cm?1. From the temperature dependence of the EPR signal intensity, the isotropic exchange-interaction constant J was evaluated. |
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