5 results for Paul, P

  • Spin states of C-60(3-) and C120On- (n=2, 3, 4) anions using electron spin transient nutation spectroscopy

    Drew, SC; Boas, JF; Pilbrow, JR; Boyd, Peter; Paul, P; Reed, CA (2003)

    Journal article
    The University of Auckland Library

    Electron spin transient nutation (ESTN) experiments show that the spin multiplicity of the ground state of C-60(3-) in frozen solution is a doublet with S = 1/2. In purified samples, there is no evidence for excited states or other species with highe

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  • Ordered structure of a distorted C fulleride ion

    Paul, P; Xie, Z; Bau, R; Boyd, Peter; Reed, CA (1994-05-04)

    Journal article
    The University of Auckland Library

    The discovery of superconductivity??? and ferromagnetism2 in salts of Cw bas focused attention on the electronic and structural properties of fulleride ions, CwF. ...

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  • Ubiquitous C120O impurity in C-60: The EPR evidence for thermally accessible excited states in C-60(2-) and C-60(3-) fullerides is artifactual.

    Reed, CA; Paul, P; Boyd, Peter (2001)

    Journal article
    The University of Auckland Library

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  • The C602- Fulleride Ion

    Boyd, Peter; Bhyrappa, P; Paul, P; Stinchcombe, J; Bolskar, RD; Sun, Y; Reed, CA (1995-03-15)

    Journal article
    The University of Auckland Library

    Synthetic, structural, and magnetic aspects of discrete C salts have been investigated to bring coherence to conflicting descriptions of the electronic structure of the Buckminsterfulleride(2-) ion. The C NMR chemical shift in DMSO solution appears as a broad signal at 184 ppm indicative of a ???40 ppm downfield paramagnetic shift relative to C. Variable-temperature magnetic susceptibility studies are consistent with essentially equi-energy singlet (S = 0) and triplet (S = 1) spin states. The EPR spectrum of C at 4 K consists of two signals. One signal is a typical axial triplet with 2D ??? 25 G. The second is a narrower, doublet-like signal proposed to arise from a triplet with 2D too small to be resolved. A further axial triplet signal is observed at higher temperatures and is ascribed to thermal occupation of a low-lying excited state. The presence of three triplet states is a natural consequence of the reduction of the symmetry of C from I to C as required by the Jahn-Teller theorem and observed in the X-ray crystal structure of [PPN][C ] (PPN = bis(triphenylphosphine)iminium). Collectively, the NMR, magnetic susceptibility, and EPR data show that, contrary to indications from recent EPR studies, C is paramagnetic.

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  • Artifacts in the electron paramagnetic resonance spectra of C-60 fullerene ions: Inevitable C120O impurity

    Paul, P; Kim, KC; Sun, D; Boyd, Peter; Reed, CA (2002)

    Journal article
    The University of Auckland Library

    Aspects of the electron paramagnetic resonance (EPR) spectra Of C-60(n) fulleride ions (n = 2, 3) and the EPR signal observed in solid C-60 are reinterpreted, Insufficient levels of reduction and the unrecognized presence Of C120O, a ubiquitous and u

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