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Thiocyanato Bridged Bimetallic Complexes (M-SCN-Co): Synthesis, Characterization and Biological Studies
Mohammad Nasir Uddin,
Tania Sultana Rupa
Issue:
Volume 3, Issue 1-1, January 2015
Pages:
1-6
Received:
18 December 2014
Accepted:
25 December 2014
Published:
27 January 2015
Abstract: A number of bimetallic thiocyanato-bridged complexes of cations [M(NH2X)6]2+ and [M(en)3]2+ with anions [Co(NCS)4]2– are prepared. Their structure has been investigated in terms of FT-IR, 13C NMR and UV-vis spectroscopy, metal analysis, magnetic and conductance studies. The complexes are proposed to have the following compositions, [M(NH2X)5][Co(NCS)4] and [{M(en)2}{Co(NCS)4}]n (where M=Cu, Ni, Zn, Cd; X=H, Ph; en=ethylenediamine). The general feature results from i. a combination of the bridging thiocyanate ligand, ii. the distorted environments of cobalt(II) and iii. regular octahedral geometry of cations. The antibacterial activity of the prepared complexes against the gram positive, Bacillus cereus and gram negative Salmonella typhi, Pseudomonas alruginosa, Escherichia coli pathogens has also been investigated.
Abstract: A number of bimetallic thiocyanato-bridged complexes of cations [M(NH2X)6]2+ and [M(en)3]2+ with anions [Co(NCS)4]2– are prepared. Their structure has been investigated in terms of FT-IR, 13C NMR and UV-vis spectroscopy, metal analysis, magnetic and conductance studies. The complexes are proposed to have the following compositions, [M(NH2X)5][Co(NC...
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Pb(II) Complexes of Schiff Bases Derived from Benzoylhydrazine as the Antibacterial Agents
Mohammad Nasir Uddin,
Md. Abdus Salam,
Jannat Sultana
Issue:
Volume 3, Issue 1-1, January 2015
Pages:
7-14
Received:
20 December 2014
Accepted:
23 December 2014
Published:
27 January 2015
Abstract: Some Pb(II) complexes of dibasic tridentate Schiff base ligands derived from aldehydes/ketones and benzoylhydrazine have been synthesized and characterized by some physico-chemical studies; elemental, spectral (IR, UV, NMR, Mass), magnetic, and conductance analyses. The CHN elemental analysis data showed the formation of 1:1 [M:L] complexes. The obtained molar conductance values revealed non-electrolytic nature. The results of magnetic moment measurements supported diamagnetic phenomenon for the complexes. The infrared spectral data displayed the main coordination sites of ligands towards Pb2+ ions. The electronic spectral results of the complexes showed π→π* (phenyl ring), n→π* (HC=N), CT transition. Based on analytical data trigonal pyramidal geometry for the prepared complexes has been proposed. The antibacterial activity of the prepared complexes was also studied against some gram positive and gram negative bacteria. It is found that some of the complexes are quite effective against tested bacteria.
Abstract: Some Pb(II) complexes of dibasic tridentate Schiff base ligands derived from aldehydes/ketones and benzoylhydrazine have been synthesized and characterized by some physico-chemical studies; elemental, spectral (IR, UV, NMR, Mass), magnetic, and conductance analyses. The CHN elemental analysis data showed the formation of 1:1 [M:L] complexes. The ob...
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Synthesis and Characterization of Metal Complexes of Schiff's Base Ligands Derived from 4-Carboxy Hydrazide-5, 6-Diphenyl-3[2-H]Pyridazone
Faten Z. Mahmoud,
Atef A. T. Ramadan,
Mohamed M. Mahmoud,
Fouz M. Omar
Issue:
Volume 3, Issue 1-1, January 2015
Pages:
15-26
Received:
11 October 2014
Accepted:
13 February 2015
Published:
27 February 2015
Abstract: A new ligand, 4-[carboxy-α-(2-hydroxyphenyl) ethylidene hydrazide-5,6-diphenyl-3(2H) pyridazinone (CHDP), were synthesized and characterized by 1H-NMR, IR spectra and elemental analysis. The dissociation equilibrium constant of CHEDP as well as the equilibrium constant for different M+n-CHEDP complexes were reported at different temperatures in 75% (v/v) dioxane-water media and constant ionic strength. The stability constants of CHDP complexes with transition and non-transition ions were evaluated. The thermodynamic parameters were also calculated and discussed. A series of mono nuclear protic M(HL), M(HL)2, ML(HL) and non-protic ML2 complex species were formed in solutions. The structure of the solid complexes formed between CHEDP and cobalt (II), copper (II) and iron (III) are substantiated by elemental analysis, mass spectra, thermal studies (TG and DSC) and IR spectra.
Abstract: A new ligand, 4-[carboxy-α-(2-hydroxyphenyl) ethylidene hydrazide-5,6-diphenyl-3(2H) pyridazinone (CHDP), were synthesized and characterized by 1H-NMR, IR spectra and elemental analysis. The dissociation equilibrium constant of CHEDP as well as the equilibrium constant for different M+n-CHEDP complexes were reported at different temperatures in 75...
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