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- W2013187439 abstract "Powder and single-crystal X- and Q-band EPR spectra show evidence for both intra- and inter-dimer exchange in [Cu2(chp)4](chp = 6-chloro-2-pyridonate). The antiferromagnetic intradimer exchange gives rise to a singlet ground state and a thermally accessible S= 1 excited state which is described by the spin-Hamiltonian parameters (from single-crystal measurements at 120 K)gzz= 2.30, gxx= 2.07, gyy= 2.05, |D|= 0.275 cm–1 and |λ|(=|E/D|)= 0.01. Dzz and gzz are colinear with the Cu—Cu vector. Interdimer exchange between neighbouring triplet state molecules is apparent by both a highly temperature dependent linewidth and an ‘extra’ feature at geff≈ 2.1, the intensity of which rapidly falls with decrease in temperature. Analysis of the linewidth variation with temperature from single-crystal measurements at X-band leads to an interdimer exchange parameter of J′≈ 0.15 cm–1. The extra feature arises from averaging of the S= 1 signals of individual dimers under the action of interdimer exchange and occurs over only a narrow range of orientations in the single crystal." @default.
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- W2013187439 date "1996-01-01" @default.
- W2013187439 modified "2023-09-26" @default.
- W2013187439 title "Multi-frequency single-crystal and powder electron paramagnetic resonance spectroscopy of [Cu2(chp)4](chp = 6-chloro-2-pyridonate)" @default.
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- W2013187439 doi "https://doi.org/10.1039/ft9969204251" @default.
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