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A solubility of the individual receptor in the organic solvent of at least 0.0025 M is required.
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-1. Therefore, the complex formation is definitely enthalpy driven. However, the differences between the receptors will also have entropic contributions. These are a matter of detailed ongoing investigations and will be further discussed in due course.
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-1. Therefore, the complex formation is definitely enthalpy driven. However, the differences between the receptors will also have entropic contributions. These are a matter of detailed ongoing investigations and will be further discussed in due course.
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For the water-free binding of caffeine, the spiro ketals have to bend towards the triphenylene by approximately 10-15°
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For the water-free binding of caffeine, the spiro ketals have to bend towards the triphenylene by approximately 10-15°.
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For comparison: 7d: 45.9% caffeine extraction; 1b-1h: > 98% caffeine extraction ([receptor] =0.001 M in toluene; 0.0001 M caffeine in HEPES/NaOH buffer, pH 7.4).
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