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Novel subphthalocyanines with long thioalkyl chains exhibit hexagonal columnar mesophases at room temperature; their inherent first hyperpolarizability values (β) measured by hyper-Rayleigh scattering (HRS) with fluorescence suppression are (189 ± 30) × 10–30 esu at 1300 nm.
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Kim et al. (1999) studied this question.
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