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Cobalt(II) and copper(II) complexes of (2-thiophene)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone.
In: Journal of Coordination Chemistry, Jg. 57 (2004-05-10), Heft 7, S. 605-614
Online
academicJournal
Zugriff:
New complexes having the formulae [L 2 CoX 2 ] and [LCuCl 2 ], [LCuCl] and [LCu](ClO 4 ) 2 where L = (2-thiophene)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone TDPTH; X = Cl, OAc or ClO 4 have been synthesized and characterized on the basis of elemental analyses, conductance, magnetic moments and infrared, electronic and ESR spectral data. The IR spectra indicate that TDPTH is a neutral bidentate ligand, coordinating via a triazine-N and azomethine-N in [L 2 CoX 2 ] and [LCuCl 2 ] with the thiophene-S not coordinated but is tridentate in [LCuCl] and [LCu](ClO 4 ) 2 through the same two nitrogen atoms and thiophene-S. The magnetic moment and electronic spectral data suggest a distorted octahedral structure for Co(II) complexes, a dimeric square pyramidal geometry for [LCuCl 2 ] through chloride bridges and a dimeric diamagnetic, four-coordinate copper in [LCu](ClO 4 ) 2 through thiophene-S bridges. The X-band ESR spectra of Co(II) complexes, in the solid state, are rhombic with three g values consistent with a high-spin distorted octahedral structure. The X-band ESR spectrum of the powdered sample of both [LCuCl 2 ]·2H 2 O and [LCu](ClO 4 ) 2 at room temperature and at 77 K showed only one broad signal due to Δ M s = ± 1 transition and a weak signal due to the forbidden Δ M s = ± 2 transition, indicating an antiferromagnetic interaction between copper(II) centers whereas [LCuCl] is ESR silent, indicating a monovalent copper ion in this complex. [ABSTRACT FROM AUTHOR]
Titel: |
Cobalt(II) and copper(II) complexes of (2-thiophene)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone.
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Autor/in / Beteiligte Person: | El-Dissouky, Ali ; Al-Fulijman ; Kandil, Samir S. |
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Zeitschrift: | Journal of Coordination Chemistry, Jg. 57 (2004-05-10), Heft 7, S. 605-614 |
Veröffentlichung: | 2004 |
Medientyp: | academicJournal |
ISSN: | 0095-8972 (print) |
DOI: | 10.1080/00958970410001701026 |
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