C. Saal

Darmstadt University of Applied Sciences, Darmstadt, Hesse, Germany

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Publications (2)2.66 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: The X-band EPR powder spectrum of bis(μ-benzoato-O,O′)-bis(benzoato-O)-bis[μ-(2-diethylamino)ethanolato-O,N]-bis(methanol) tricopper(II) (CuEtBz · McOH) at liquid-helium temperature is dominated by a resonance with g′ ≈ 4.3 (the prime indicates effective g-values). This signal shows a very unusual temperature dependent resonance shift with a variation of the effective g-value to g′ ≈ 2.6 at room temperature. Single-crystal EPR investigations on this compound at 4.2 K were carried out to determine the effective g-values of the quartet ground state: gz′ = 2.1(1), gx′ = 4.0(1) and gy′ = 4.7(1). In the temperature-dependent high-field EPR spectra recorded with a resonance frequency ν = 244.99 GHz, no resonance shifts were observed. Based on this observation and on simulations of the temperature dependence of the X-band signal, it was possible to show that the signal shift occurs because the signals of the three spin states of the molecule are not resolved in the X-band experiment. Therefore the observed signal embodies the contributions of each spin state, yielding a temperature-dependent resonance field due to the varying thermal populations of the different levels.
    Journal of Magnetism and Magnetic Materials 06/1996; 159(s 1–2):166–174. · 1.83 Impact Factor
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    ABSTRACT: The phosphorescence spectrum of [70]-fullerene in a glassy toluene matrix has been investigated at 77, 4.2 and 1.2 K. At 77 K, only one decay time (47.0 ms) has been observed while at 4.2 and 1.2 K two decay times (46.7, 5.6 ms and 46.6, 24.2 ms, respectively) were recorded. The zero field splitting parameters |D|=0.00489(25) cm−1 and |E|=0.00135(7) cm−1 were measured at 1.2 K using a pulsed ODMR technique.
    Applied Magnetic Resonance 01/1996; 11(2):335-350. · 0.83 Impact Factor