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Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

Synthesis, Structure and Redox Properties of Nickel Complexes of Cage Amine Ligands

IJ Clark, II Creaser, LM Engelhardt, JM Harrowfield, ER Krausz, GM Moran, AM Sargeson and AH White

Australian Journal of Chemistry 46(1) 111 - 126
Published: 1993

Abstract

The syntheses of complexes containing the [Ni( sar )]2+/3+ and [Ni((NH3)2sar)]4+ ions are described along with an X-ray crystal structure analysis of the salt [Ni((NH3)2sar)] (NO3)4.H2O ( sar is 3,6,10,13,16,19-hexaazabicyclo[6.6.6] icosane ; (NH3)2sar2+ is its 1,8-diammonio derivative). The NiIII ion is a powerful oxidant, with E′ = 0.90 V (v. n.h.e. at 298 K, I = 0.2, aqueous trifluoromethanesulfonate medium), but is relatively stable in dilute aqueous acid. Both the NiII and NiIII complexes of sar have been resolved into their enantiomeric forms, and their absorption, optical rotatory dispersion and circular dichroism spectra recorded and partly analysed. The electron self-exchange rate between enantiomeric forms in the different oxidation states has been measured by a stopped-flow circular dichroism method, and ket = (5.3±0.3)×103 dm3 mol-1 s-1 at 298 K, I = 0.2 (NaCF3SO3). The activation parameters, ΔH‡ 22±4 kJ mol-1 and ΔS‡ -100±12 J K-1 mol-1, and the rate constants are consistent with the comparatively small rearrangements required in the structures of the two ions relative to the optimal cavity radius for the cage of 2.05(1) Ǻ.

https://doi.org/10.1071/CH9930111

© CSIRO 1993

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