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- W2103477572 abstract "Two new selenacrown ethers, i.e., N,N′-dimethyl-1,11-diaza-4,8,14,18,-tetraselenacycloicosane (1) and 7,11-diseleno-2,3,15,16,-dibenzo-1,4,14,17,20,23-hexaoxacyclopentacosane (2), have been synthesized and characterized by elemental analysis and UV, and 1H-NMR spectroscopy. An X-ray crystallographic structure was obtained for 1. UV-spectrophotometric titrations have been performed in CCl4 solution at 25–50 °C to obtain the complex stability constants (K s ) and the thermodynamic parameters (ΔH0 and TΔS0) for the stoichiometric 1:1 complexation of [60]-fullerene (C60) with the crown ethers 1–4. The obtained K s values together with that reported for dicyclohexano-24-crown-8 (5) reveal that, the more the heteroatom numbers in crown ether ring are, and the larger the cavity sizes of crown ethers are, the higher theK s values for complexation with C60 are. Thermodynamically, the complexation of C60 with 1–5 is absolutely enthalpy-driven in CCl4, while the complex stability is governed by the entropy term." @default.
- W2103477572 created "2016-06-24" @default.
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- W2103477572 date "2005-04-01" @default.
- W2103477572 modified "2023-09-27" @default.
- W2103477572 title "Synthesis of Some Selenacrown Ethers and the Thermodynamic Origin of Their Complexation with C60" @default.
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- W2103477572 doi "https://doi.org/10.1007/s10847-005-0662-6" @default.
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