Title

Cobalt(III) Complexes with the Disubstituted Tetraamine Ligand I, 1 O-Diamino-2,9-dimethyl-4,7-diazadecane

Document Type

Article

Publication Date

5-1983

Publication Source

Inorganic Chemistry

Abstract

As part of our continuing studies of the stereochemistry of transition-metal complexes, cobalt(II1) complexes with the tetraamine ligand 1 ,lO-diamino-2,9-dimethyl-4,7-diazadecane were prepared. The two asymmetric carbon centers and two asymmetric nitrogen centers admit the possibility of six unique trans isomers. Two trans-dichloro complexes were isolated and characterized by IH and I3C NMR and by vibrational and electronic spectroscopy. Strain energy minimization calculations indicate the steric requirement for axial methyl substitution exceeds the induced ring strain leading to a high degree of stereoselectivity. Significant distortions in the chelate ring conformations are reflected in increased C-C-C and N-C-C angles of one of the six-membered chelate rings of one isomer. These conformational differences are apparent in both the 13C and proton NMR spectra.

Inclusive pages

1422–1426

ISBN/ISSN

0020-1669

Publisher

American Chemical Society

Volume

22

Issue

10

Peer Reviewed

yes