caa a22 4500 465775209 CHVBK 20180323111939.0 cr unu---uuuuu 170327e19900201xx s 000 0 eng 10.1007/BF01032222 doi (NATIONALLICENCE)springer-10.1007/BF01032222 Structural studies on cadmium(II), cobalt(II), copper(II), nickel(II) and zinc(II) complexes of 1-malonyl-bis(4-phenylthiosemicarbazide) [Elektronische Daten] [Ahmed El-Asmy, Taj Al-Ansi, Ragab Amin, F. El-Shahat] Summary: Several new complexes of the title ligand (H2MPTS) with CoII, NiII, CuII, and CdII have been prepared. Structural assignments of the complexes have been made based on elemental analysis, molar conductivity, magnetic moment and spectral (i.r.,1H n.m.r., reflectance) studies. The compounds are non-conductors in dimethylsulphoxide. The neutral molecule is coordinated to the metal(II) sulphate as a bidentate ligandvia the two carbonyl groups. The ligand reacts with the metal(II) chlorides with the liberation of two hydrogen ions, behaving as a bianionic quadridentate (NONO) donor. Enolization is confirmed by the pH-titration of H2 MPTS and its metal(II) complexes against NaOH. A distorted octahedral structure is proposed for the CuII complex, while a square planar structure is suggested for both CoII and NiII complexes. The stoichiometry of the complexes formed in EtOH and buffer solutions, their apparent formation constants and the ranges for obedience to Beer's law are reported for CoII, NiII and CuII ions. The ligand pK values are calculated. The antimicrobial activity of H2 MPTS and its CoII, NiII, CuII and MnII complexes is demonstrated. Chapman and Hall Ltd., 1990 El-Asmy Ahmed Chemistry Department, Faculty of Science, Sana'a University, P.O. Box 11503, Sana'a, Yemen AR aut Al-Ansi Taj Chemistry Department, Faculty of Science, Sana'a University, P.O. Box 11503, Sana'a, Yemen AR aut Amin Ragab Chemistry Department, Faculty of Science, Sana'a University, P.O. Box 11503, Sana'a, Yemen AR aut El-Shahat F. Chemistry Department, Faculty of Science, Sana'a University, P.O. Box 11503, Sana'a, Yemen AR aut Transition Metal Chemistry Kluwer Academic Publishers 15/1(1990-02-01), 12-15 0340-4285 15:1<12 1990 15 11243 https://doi.org/10.1007/BF01032222 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01032222 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- El-Asmy Ahmed Chemistry Department, Faculty of Science, Sana'a University, P.O. Box 11503, Sana'a, Yemen AR aut NATIONALLICENCE 700 1- Al-Ansi Taj Chemistry Department, Faculty of Science, Sana'a University, P.O. Box 11503, Sana'a, Yemen AR aut NATIONALLICENCE 700 1- Amin Ragab Chemistry Department, Faculty of Science, Sana'a University, P.O. Box 11503, Sana'a, Yemen AR aut NATIONALLICENCE 700 1- El-Shahat F. Chemistry Department, Faculty of Science, Sana'a University, P.O. Box 11503, Sana'a, Yemen AR aut NATIONALLICENCE 773 0- Transition Metal Chemistry Kluwer Academic Publishers 15/1(1990-02-01), 12-15 0340-4285 15:1<12 1990 15 11243 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer