Circular Dichroism Spectra of Tetraamminecobalt(III) Complexes of Amino Alcohols

Hawkins C.J., Lawrance G.A. and Palmer J.A. (1978) Circular Dichroism Spectra of Tetraamminecobalt(III) Complexes of Amino Alcohols. Australian Journal of Chemistry, 31 11: 2399-2408. doi:10.1071/CH9782399


Author Hawkins C.J.
Lawrance G.A.
Palmer J.A.
Title Circular Dichroism Spectra of Tetraamminecobalt(III) Complexes of Amino Alcohols
Journal name Australian Journal of Chemistry   Check publisher's open access policy
ISSN 1445-0038
Publication date 1978-01-01
Sub-type Article (original research)
DOI 10.1071/CH9782399
Volume 31
Issue 11
Start page 2399
End page 2408
Total pages 10
Subject 1600 Chemistry
Abstract The circular dichroism spectra are reported for tetraamminecobalt(III) complexes with the chiral amino alcohols 2-aminopropan-1-ol, 2-aminobutan-1-ol, l-aminopropan-2-ol, 2-amino-1-phenyl- ethanol, ψ-ephedrine and ephedrine with the alcohol groups protonated (OH) and deprotonated (O-). The solvent dependence of the chemical shifts of the NH protons was investigated to determine the effects of stereoselective solvation on the circular dichroism, but, in contrast to some other related systems, the chemical shift difference between the two NH2protons was relatively insensitive to solvent. Consistent with this, the circular dichroism spectra of the tetraphenylborate salts of the deprotonated complexes were found not to be markedly dependent on solvent. Tetraammine- ((-)-ψ-ephedrine)cobalt(III) and tetraammine((-)-ephedrine)cobalt(iii) were found to have the same signs of Cotton effects for the various d-d transitions, whereas bis((-)-ψ-ephedrine)copper(ii) and bis((-)-ephedrine)copper(ii) had opposite signs. This has been explained in terms of different conformer populations in the cobalt(iii) and copper(ii) systems.
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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Created: Tue, 04 Oct 2016, 12:30:47 EST by System User