Abstract
ΔH 0 and ΔS 0 values of the complex formation in water of benzo-18-crown-6 (B18C6) with K+, Tl+, and Pb2+ were determined and compared with those of 18-crown-6. The ΔH0 values of B18C6 are negative. The stability in water of the B18C6-metal ion complex at 25°C is governed largely by the magnitude of the ΔH 0 value. The B18C6-metal ion complex is less stable in water than the corresponding 18C6-metal ion complex. This is due largely to a less favorable enthalpic contribution of the B18C6-metal ion complex compared with the corresponding 18C6-metal ion complex. The two aromatic ether oxygen atoms of B18C6 are responsible for the larger ΔH 0 value of the B18C6-metal ion complex compared with the corresponding 18C6-metal ion complex.
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Takeda, Y. Thermodynamic study of complex formation of benzo-18-crown-6 with K+, Tl+, and Pb2+ in water. J Incl Phenom Macrocycl Chem 9, 309–313 (1990). https://doi.org/10.1007/BF01033310
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DOI: https://doi.org/10.1007/BF01033310