作者:Neelam Bharti、Shailendra、Simon J. Coles、Michael B. Hursthouse、Thomas A. Mayer、M. T. Gonzalez Garza、Delia E. Cruz-Vega、Benito D. Mata-Cardenas、Fehmida Naqvi、Mannar R. Maurya、Amir Azam
DOI:10.1002/1522-2675(200209)85:9<2704::aid-hlca2704>3.0.co;2-x
日期:2002.9
Reaction of trans-[PdCl2(DMSO)(2)]. cis-[PtCl2(DMSO)(2)]. and [Cu(OAc)(2)](H2O)-H-. with metronidazole (mnz) leads to the formation of new complexes, i.e., trans-[PdCl2(mnz)(2)] (1), trans-[PtCl2(mnz)(2)] (2). and trans-[Cu-2(OAc)(4)(mnz)(2)] (3), respectively. Complexes 1-3 crystallize all in the centrosymmetric monoclinic space group P2(1)/c with Z = 8. Unit-cell parameters for these complexes are: 1, a = 7.1328(14) Angstrom, b = 20.699(4) Angstrom, c = 7.1455(14) Angstrom, and beta = 116.17(3)degrees; 2, a = 9.9169(14) Angstrom, b = 21.853(4) Angstrom, c = 6.7218(13) Angstrom, and beta = 110.79(3)degrees: 3. a = 9.1663(18) Angstrom, b = 19.129(4) Angstrom, c = 8.9446(18) Angstrom, and beta = 116.44(3)degrees. The complexes 1 and 2 maintain an ideal square-planar geometry. In complex 3, the H2O molecules of the starting complex are replaced by metronidazole while maintaining a dimeric structure of [Cu(OAc)(2)]. Each Cu ion has an ideal octahedral structure, though distortion occurs in the equatorial position where the acetato ligands are attached. The Cu-Cu separation of 2.6343(8) Angstrom indicates considerable metal-metal interaction. The testing of the antiamoebic activity of these complexes against the protozoan parasite Entamoeba histolytica suggests that compound 1-3 might be endowed with important antiamoebic properties since they showed IC50 values in a muM range better than metronidazole (Table 2). Thus, compound 1 displayed more effective amoebicidal activity than metronidazole (IC50 values of 0.103 muM vs. 1.50 muM resp.).