Cobalt(II), nickel(II) and copper(II) complexes of 5-(2-carboxyphenylazo)-2-thiohydantoin.
In: Transition Metal Chemistry, Jg. 28 (2003-03-01), Heft 2, S. 168-175
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Zugriff:
A new series of hexacoordinate cobalt(II), nickel(II) and copper(II) complexes of 5-(2-carboxyphenylazo)-2-thiohydantoin HL having formulae [LM(OAc)(H 2 O) 2 ] · nH 2 O (M = Co II , Cu II and Ni II ), [LM′Cl(H 2 O) 2 ] · nH 2 O (M′ = Co II and Ni II ), [LCuCl(H 2 O)] 2 · 2H 2 O, [LCu(H 2 O) 3 ](ClO 4 ) and [LCu(HSO 4 )(H 2 O) 2 ] were isolated and characterized by elemental analyses, molar conductivities and magnetic susceptibilities, and by i.r., electronic and e.s.r. spectral measurements, as well as by thermal (t.g. and d.t.g.) analyses. The i.r. spectra indicate that the ligand HL behaves as a monobasic tridentate towards the three divalent metal ions via an azo-N, carboxylate-O and thiohydantoin-O atom. The magnetic moments and electronic spectral data suggest an octahedral geometry for Co II complexes, distorted octahedral geometry for both Ni II and Cu II complexes with a dimeric structure for [LCuCl(H 2 O)] 2 · 2H 2 O through bridged chloro ligands. The X-band e.s.r. spectra reveal an axial symmetry for the copper(II) complexes with unsymmetrical ΔM s = ± 1 signal and G-parameter less than four for the dimeric [LCuCl(H 2 O)] 2 · 2H 2 O. The thermogravimetry (t.g. and d.t.g.) of some complexes were studied; the order and kinetic parameters of their thermal degradation were determined by applying Coats–Redfern method and discussed. [ABSTRACT FROM AUTHOR]
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Titel: |
Cobalt(II), nickel(II) and copper(II) complexes of 5-(2-carboxyphenylazo)-2-thiohydantoin.
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Autor/in / Beteiligte Person: | Kandil, Samir ; El-Hefnawy, Gad ; Bakr, Eman ; Abou El-Ezz, Amro |
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Zeitschrift: | Transition Metal Chemistry, Jg. 28 (2003-03-01), Heft 2, S. 168-175 |
Veröffentlichung: | 2003 |
Medientyp: | academicJournal |
ISSN: | 0340-4285 (print) |
DOI: | 10.1023/A:1022968604281 |
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