Charge transfer complexes of indole: Catechol type II
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| Abstract: | Charge transfer complexes between tryptamine: epinephrine, tryptamine: isoproterenol, tryptamine: catechol, and indole: catechol were demonstrated spectrophotometrically in aqueous solutions containing 0.1 M HCI. It was possible to make precise measurements and to calculate thermodynamic parameters and molar absorptivities. In general, the equilibrium constant was found to be quite low and ranged from 4.00 ± 0.04 to 0.30 ± 0.02 M−1. These interactions are exothermic and have relatively large standard enthalpy and entropy changes (ΔH° values ranged from −7.4 ± 0.3 to −5.2 ± 0.4 kcal mol 1; ΔS° ranged from −25 ± 5.0 to −16 ± 1.3 cal K−1 mol−1). The similarity in ΔH° and ΔS° values for all the combinations indicates a similar interacting system. This result has led us to propose the involvement of the charge transfer effect, induced in the indole: catechol system, in the mechanism occurring in nerve conductions. |
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| Year: | 2006 |
| Source: | Journal of Pharmaceutical Sciences |
| Volume-OnPage: | Volume 77 Issue 6544-547 |
| Publication Date:
| June 1988 |
| Keyword: | |
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