2 results for PENICAUD, A

  • BUCKMINSTERFULLERIDE(1-) SALTS - SYNTHESIS, EPR, AND THE JAHN-TELLER DISTORTION OF C-60-

    STINCHCOMBE, J; PENICAUD, A; BHYRAPPA, P; Boyd, Peter; REED, CA (1993-06-16)

    Journal article
    The University of Auckland Library

    Synthetic methods are reported for the isolation of a number of buckminsterfulleride(1-) salts. Counterions include cobaltocenium ion, Na(dibenzo-18-crown-6)+, and bis(N-methylimidazole)(tetraphenylporphinato)tin(IV)2+. The EPR spectrum of C60- in frozen solution shows two unusual features. First, there is a counterion-dependent anisotropy observed at low temperatures. This is ascribed to an ellipsoidal distortion induced by ion pairing. It is consistent with, but not directly ascribable to, a static Jahn-Teller distortion. Second, there are two components to the high-temperature spectrum: the broad essentially Isotropic, major signal and a narrower "spike". The narrower signal is ascribed to thermal population of a low-lying excited state, a natural consequence of the distortion that splits the 2T1u state into closely spaced 2E and 2A states. In contrast to intuition and to ab initio calculations, the 2E state is lowest in most systems studied to date.

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  • NOVEL FORMATION OF A LINEAR TRINUCLEAR FERRIC COMPLEX CONTAINING A MU-OXO BIS(MU-ACETATO) AND A MU-HYDROXO BIS(MU-ACETATO) BRIDGE

    KITAJIMA, N; AMAGAI, H; TAMURA, N; ITO, M; MOROOKA, Y; HEERWEGH, K; PENICAUD, A; MATHUR, R; REED, CA; Boyd, Peter (1993-08-18)

    Journal article
    The University of Auckland Library

    The reaction of monomeric five-coordinate iron(I1) complexes such as Fe(OBz)(HB(3,5-iPr~pz)~) (1) withdioxygen was recently shown to give p-peroxo iron(II1) dimers that are reasonably stable and characterizable.'...

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