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- W2028509642 abstract "We have tried to prepare the metallophthalocyanine sheet polymer (poly-MPPc) by applying high pressure and temperature. The poly-CuPc and poly-NiPc compounds synthesized under 5 GPa at 400–780°C are systematically studied here with the use of X- and Q-band ESR spectroscopy. In addition to the broad ESR signal derived from the local spins on Cu2+, new paramagnetic species appear which exhibit an anisotropic spectrum with an axial symmetry having linewidth ΔH = 1–1.2 G. The principal values of the g tensor of this new signal are 2.0024 in the parallel component and 2.0030 in the perpendicular one. Spin concentration of these new species is estimated to be (7–9) × 1019 spins g−1 which is approximately two orders of magnitude greater than that of the CuPc sheet oligomer which was synthesized under ambient pressure. The substitution of the central metal does not strongly influence the ESR properties of the narrow signal. We suppose that the new signal comes from the delocalized π-electrons of the sheet polymer. On the other hand, in the samples synthesized at temperatures higher than 650°C, the broad and narrow signals merge into a single symmetric signal. We explain the ESR properties of these compounds from the viewpoint of the sheet polymer model." @default.
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- W2028509642 date "1994-06-01" @default.
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- W2028509642 title "X- and Q-band ESR study of new poly-CuPc compounds synthesized under high pressure: the possibility of two-dimensional sheet polymers" @default.
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- W2028509642 doi "https://doi.org/10.1016/0379-6779(94)90115-5" @default.
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