Searle, Graeme E., Lincoln, Stephen F., Keene, F. Richard, Teague, Stewart G., and Rowe, David G. (1977) Bis(tridentate)cobalt(III) complexes with diethylenetriamine and 4-Methyldiethylenetriamine [2,2'-Methyliminodi(ethylamine)]: assignment of geometric configurations by 1H and 13C N.M.R. spectroscopy. Australian Journal of Chemistry, 30 (6). pp. 1221-1228.

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Abstract

The new complexes symmetrical-facial-[Co(medien)₂]³⁺ and s-fac- [Co(dien)(medien)]³⁺ have been isolated. The ¹H NMR spectra of these complexes, the s-far, u-far and meridional isomers of [Co(dien)₂]³⁺, and u-fac-[Co(daes)₂]³⁺ show different splittings of the NH₂ proton resonances [dien = diethylenetriamine, medien = 4- methyldiethylenetriamine or 2,2'-methyliminodi(ethyl-amine), daes = di(2-aminoethyl) sulphide or 2,2'-thiodi(ethylamine)]. These splittings depend on the geometries of the complexes (different numbers of stereochemically distinct NH₂ groups), the particular chelated ligands (splittings due to coupling between the two protons on each NH₂ may vary with chelate ring conformational mobility), and the counter-anions (different extents of ion- association through hydrogen bonding). Thus NH₂ proton resonance signals may not always provide a reliable method for establishing molecular geometries. In contrast, the ¹³C NMR spectra of all these complexes are completely diagnostic of the detailed geometries, and most of the resonances observed have been assigned to particular carbon atoms.

Item ID:	22820
Item Type:	Article (Research - C1)
ISSN:	1445-0038
Date Deposited:	14 Sep 2012 03:06
FoR Codes:	03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030207 Transition Metal Chemistry @ 100%
SEO Codes:	97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
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