Circular dichroism spectra of cobalt(III) and platinum(II) complexes of the tert-butyl-substituted diamine 3,3-dimethyl-1,2-butanediamine

Hawkins C.J. and Martin J. (1982) Circular dichroism spectra of cobalt(III) and platinum(II) complexes of the tert-butyl-substituted diamine 3,3-dimethyl-1,2-butanediamine. Inorganic Chemistry, 21 3: 1074-1081.

Author Hawkins C.J.
Martin J.
Title Circular dichroism spectra of cobalt(III) and platinum(II) complexes of the tert-butyl-substituted diamine 3,3-dimethyl-1,2-butanediamine
Journal name Inorganic Chemistry   Check publisher's open access policy
ISSN 0020-1669
Publication date 1982-01-01
Sub-type Article (original research)
Volume 21
Issue 3
Start page 1074
End page 1081
Total pages 8
Subject 1604 Human Geography
Abstract The tert-butyl-substituted diamine (S)-3,3-dimethyl-1,2-butanediamine (dmbn) forms five-membered chelate rings with metals that are effectively restricted to the δ conformation in which the tert-butyl group is equatorial. The absorption and circular dichroism spectra are reported for [Co(NH3)4((S)-dmbn)]3+, [Co(CN)4((S)-dmbn)]-, trans-[CoCl2((S)-dmbn)2]+, Λ-[Co((S)-dmbn)3]3+, and [Pt(NH3)2((S)-dmbn)]2+. The spectra are compared to those for other monosubstituted diamines 1,2-propanediamine (pn) and 1-phenyl-1,2-ethanediamine, and it is concluded that in [Pt(NH3)2((S)-pn)]2+ the δ conformation is 70% populated. The effect of solvation on the spectra is examined, and on the basis of the results of 1H NMR spectroscopy of the complexes, the changes in the circular dichroism with solvent are interpreted in terms of the creation of asymmetric nitrogen donors via the stereoselective solvation of the NH2 protons. The bulky tert-butyl group is found to limit solvation at the adjacent NH2 compared to the analogous methyl derivative. The 13C NMR spectra show no evidence that more than one geometrical isomer of trans-[CoCl2((S)-dmbn)2]+ and Λ-[Co((S)-dmbn)3]3+ is present, and the spectrum of the latter complex is consistent with the facial structure. The 59Co spectrum of the tris complex confirms the presence of only one isomer.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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