Publications (2)4.09 Total impact
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Article: Synthesis, crystal structure and magnetic studies of cis-configuration copper(II)—M(II) (M = Ba, Ca) complexes of novel Schiff bases derived from salicylaldehyde and dipeptides
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ABSTRACT: The novel heteronuclear complexes [M(CuL)2]2 nH2O [M = Ba (1), Ca (2); H2L = N-salicylideneglycylglycine] were synthesized and characterized, and the crystal structure of complex (1) was determined by X-ray diffraction. The entire structure is held together by an extensive network of H-bonds and – interactions. Variable-temperature magnetic susceptibility measurements (75–300 K) revealed the occurrence of an intramolecular antiferromagnetic interaction in (1) and (2).Transition Metal Chemistry 03/2003; 28(3):350-355. · 1.02 Impact Factor -
Article: Study on self-assembled monolayers of functionalized azobenzene thiols on gold: XPS, electrochemical properties, and surface-enhanced Raman spectroscopy.
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ABSTRACT: Self-assembled monolayers (SAMs) of 4-acetamino-4'-(4-mercaptobutoxy)azobenzene (CH3)CONH-ph-N=N-ph-O(CH2)(4)SH, abbr. aaAzoC4SH) and 4-mercaptobutoxy azobenzene (ph-N=N-ph-O(CH2)(4)SH, abbr. AzoC4SH) on a gold surface have been studied by X-ray photoelectron spectroscopy (XPS), FT Raman spectroscopy, and electrochemistry. A surface-enhanced Raman scattering (SERS)-active system with a "sandwiched" structure of Ag/R-Azo-C4S-/Au was conveniently obtained by the method of Tollen's test. The relationship between the SERS effect and the structural nature of the system indicates that the enhancement correlates to both the silver islands above and the gold substrate underneath. The redox behaviors of the self-assembly on gold electrodes showed that the SAMs of the two compounds exhibit well-behaved voltammetric responses in a Britton-Robinson buffer corresponding to the irreversible two-electron, two-proton reduction-oxidation of azobenzene. The apparent electron-transfer rate kinetics is very sluggish, and the rate constant k(app) of aaAzoC4SH/Au (1.34 x 10(-6) s(-1)) is lower than that of AzoC4SH/Au (1.63 x 10(-4) s(-1)), which may be attributed to the different spatial restriction of close-packing structures on the conformational change accompanied by electron and proton transfer in the SAMs.Journal of Colloid and Interface Science 12/2002; 255(1):150-7. · 3.07 Impact Factor
