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By means of the negative solvatochromic betaine dyes 1a, b , the UV/Vis‐spectroscopically derived empirical solvent polarity parameter E T ( 30 ) for supercritical carbon dioxide (sc‐CO 2 ) was determined in the temperature and pressure ranges 40–80°C and 150–550 bar, respectively.
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Eberhardt et al. (1997) studied this question.
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