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Author Jones, L. A. ♦ Sharpe, P. C.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CHEMISTRY ♦ MATERIALS SCIENCE ♦ COBALT COMPLEXES ♦ NMR SPECTRA ♦ ELECTRON TRANSFER ♦ SYNTHESIS ♦ MOLECULAR STRUCTURE ♦ CRYSTAL STRUCTURE ♦ STRUCTURAL CHEMICAL ANALYSIS ♦ ISOMERIZATION ♦ COMPARATIVE EVALUATIONS ♦ TENSILE PROPERTIES ♦ VARIATIONS ♦ CHEMICAL BONDS ♦ BOND LENGTHS ♦ BOND ANGLE ♦ LIGANDS ♦ AMINES ♦ ELECTROCHEMISTRY ♦ X-RAY DIFFRACTION
Abstract The synthesis and characterization of the new macrocyclic hexaamine trans-(5(S),12(R), 14(R)-tetramethyl)-1,4,8,11-tetraazacyclotetradecane-6,13-diamine (L{sup 6}) and its Co{sup III} complex are reported. The X-ray crystal structural analyses of [CoL{sup 6}]Cl{sub 2}(ClO{sub 4}) and the closely related cis-diamino-substituted macrocyclic complex [CoL{sup 2}](ClO{sub 4}){sub 3}{center_dot} 2H{sub 2}O reveal significant variations in the observed Co-N bond lengths and coordination geometries, which may be attributed to the trans or cis disposition of the pendent primary amines. The Co{sup III/II} self-exchange electron transfer rate constants for these and other closely related hexaamines have been determined, and variations of some 2 orders of magnitude are found between pairs of trans and cis isomeric Co{sup III} complexes. 30 refs., 5 figs., 3 tabs.
ISSN 00201669
Educational Use Research
Learning Resource Type Article
Publisher Date 1997-05-21
Publisher Place United States
Journal Inorganic Chemistry
Volume Number 36
Issue Number 11


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