Cobalt(II) and Copper(II) Complexes of (2-Acetylpyridine)-(5,6-Diphenyl-[1,2,4]Triazin-3-YL) Hydrazone.
In: Journal of Coordination Chemistry, Jg. 57 (2004-01-20), Heft 2, S. 105-113
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Zugriff:
A series of cobalt(II) and copper(II) complexes of (2-acetylpyridine)-(5,6-diphenyl-[1,2,4]triazin-3-yl) hydrazone, APyTHy, L, having the formulae [LMCl 2 ]· n H 2 O, [L 2 Cu(H 2 O) 2 ](ClO 4 ) 2 and [L 2 M]X 2 · n H 2 O (X = ClO 4 or OAc; M = Co or Cu and n = 0, 2 or 4) were isolated and characterized by elemental analysis, molar conductance, magnetic moment and IR, electronic and ESR spectral measurements. The IR spectra indicate that APyTHy behaves as a neutral tridentate ligand, coordinating via a triazine-N, azomethine-N and pyridine-N, except for [LCuCl 2 ] and [L 2 Cu]X 2 · n H 2 O (X = OAc or ClO 4 ), where it acts as a bidentate, not using the triazine-N in complexation. The magnetic moment and electronic spectral data suggest a distorted octahedral structure for 1 : 2 Co(II) complexes, a tetrahedral geometry for 1 : 2 Cu(II) complexes and a trigonal bipyramidal structure for [LCu(H 2 O) 2 ](ClO 4 ) 2 and [LMCl 2 ]· n H 2 O (M = Co II or Cu II ; n = 0 or 2) complexes. Upon heating the green [LCuCl 2 ]·2H 2 O, brown square planar [LCuCl 2 ] was produced. The mixing coefficients and covalency factors for the copper(II) complexes estimated from the combined X-band ESR g -values and electronic d-d transitions using Reinen's method imply that the CuN 3 X 2 chromophore is considerably distorted towards square pyramidal. [ABSTRACT FROM AUTHOR]
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Titel: |
Cobalt(II) and Copper(II) Complexes of (2-Acetylpyridine)-(5,6-Diphenyl-[1,2,4]Triazin-3-YL) Hydrazone.
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Autor/in / Beteiligte Person: | Kandil, Samir S. ; El-Dissouky, Ali ; Ali, Gamila Y. |
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Zeitschrift: | Journal of Coordination Chemistry, Jg. 57 (2004-01-20), Heft 2, S. 105-113 |
Veröffentlichung: | 2004 |
Medientyp: | academicJournal |
ISSN: | 0095-8972 (print) |
DOI: | 10.1080/00958970410001664956 |
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