Synthesis and characterization of cobalt(III) complexes with sinambic amplector ligands

Sharrad, C. A. and Gahan, L. R. (2004) Synthesis and characterization of cobalt(III) complexes with sinambic amplector ligands. Polyhedron, 23 14: 2217-2226. doi:10.1016/j.poly.2004.06.033


Author Sharrad, C. A.
Gahan, L. R.
Title Synthesis and characterization of cobalt(III) complexes with sinambic amplector ligands
Journal name Polyhedron   Check publisher's open access policy
ISSN 0277-5387
Publication date 2004-01-01
Sub-type Article (original research)
DOI 10.1016/j.poly.2004.06.033
Volume 23
Issue 14
Start page 2217
End page 2226
Total pages 10
Place of publication Oxford
Publisher Pergamon-Elsevier
Language eng
Subject C1
250201 Transition Metal Chemistry
780102 Physical sciences
Abstract The synthesis of the hexadentate ligand 5,6-dimethyl-2,2,9,9-tetra(methyleneamine)-4,7-dithiadecane (1,2-Me(2)EtN(4)S(2)amp) is reported. The diastereiosomers were separated as cobalt(III) complexes using cation exchange chromatography. The rac and mesa isomers were characterized by NMR (C-13, H-1, Co-59), ESI-MS, UV-Vis spectroscopy and cyclic voltammetry. Single crystals of [Co(rac-1,2-Me(2)EtN(4)S(2)amp)] Cl-2(ClO4) (.) 2H(2)O were characterized by X-ray diffraction. The low-temperature (11 K) absorption spectra of the complexes have been measured in Nafion films and from the observed positions of both spin-allowed (1)A(1g) --> T-1(1g) and (1)A(1g) --> T-1(2g) and spin forbidden (1)A(1g) --> T-3(2g) bands, octahedral ligand-field parameters (10Dq, B and C) were determined. These results, in conjunction with the Co-59 NMR data, are used to further explore the relationship between the Co-59 magnetogyric ratio (gamma(Co)) and the product of the nephelauxetic ratio and the wavelength of the (1)A(1g) --> T-1(1g) transition (beta(DeltaE)(-1)) for complexes of mixed donor nitrogen-thioether ligands. (C) 2004 Elsevier Ltd. All rights reserved.
Keyword Chemistry, Inorganic & Nuclear
Crystallography
Multidentate Ligand
Cobalt(iii)
Sinambic
Co-59 Nmr
Crystal-structure
Resonance Spectra
Chemical-shifts
Tris(2,3-butanediamine)cobalt(iii)
2-methyl-1,3-propanediamine
Spectroscopy
Isomers
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 13:46:20 EST