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- W2079676818 abstract "The cation and solvent induced dimerization of free base tetra-crowned phthalocyanine (H2tCRPc) and its metal derivatives (Ag2+ and VO2+) have been studied by optical and ESR methods. Dimerization induces a blue shift of Q and Soret bands in the optical spectrum with a reduction in intensity. The exciton formalism accounts for the spectral blue shift upon dimerization. ESR studies reveal the formation of a cofacial dimer with axial symmetry upon the addition of cations. The measured zero-field splitting values in parallel and perpendicular regions suggest that the two paramagnetic centres are separated by 4.9 Å in VOtCRPc and 4.8 Å in AgtCRPc. In the micellar medium, the dimerization effects are observed only in 0.1 M SDS, while the tetra-crowned phthalocyanines remain aggregated in 0.1 M CTAB and in 5% TX-100." @default.
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- W2079676818 date "1993-03-01" @default.
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- W2079676818 title "Optical and ESR studies on dimerization of metallotetra-crowned phthalocyanines" @default.
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- W2079676818 doi "https://doi.org/10.1016/s0277-5387(00)84979-7" @default.
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