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    題名: Structure of benzo- and dibenzocrown ethers and their H-bonded adducts. 4. Structural motifs in the 2,4-dithiouracil complexes with 4-bromo- and 4-nitrobenzo-18-crown-6, [2.4]dibenzo- and thia[1.5]dibenzo-18-crown-6
    作者: Fonari, Marina S.;Simonov, Yurii A.;Bocelli, Gabriele;Ganin, Eduard V.;王文竹;Wang, Wen-jwu;Pluzhnik-Gladyr, Sergei M.;Tkachyuk, Vyacheslav V.;Kotlyar, Sergei A.;Kamalov, Gerbert L.
    貢獻者: 淡江大學化學學系
    關鍵詞: benzo- and dibenzocrown ethers;complexes;2, 4-dithiouracil;hydrogen bonding;synthesis;crystal structure
    日期: 2008-08
    上傳時間: 2010-08-09 16:21:20 (UTC+8)
    出版者: Dordrecht: Springer Netherlands
    摘要: Four novel complexes of 2,4-dithiouracil (pyrimidine-2,4(1H,3H)-dithione, DTU) with 18-membered benzo- and dibenzo-crown ethers were synthesized in approximately the same conditions and studied by single crystal diffraction. Hydrogen bonding was observed to be the most important for the complexation in the solid state but pi-pi interactions also contribute to it. The crystalline monohydrates of the 1:1:1 stoichiometry are recorded for 4-bromo- and 4-nitrobenzo-18-crown-6 (complexes 1 and 2), while complexes with [2.4]dibenzo- and thia[1.5]dibenzo-18-crown-6 (complexes 3 and 4) represent anhydrous adducts of the 2:2 ratio. The crystal structures reveal three supramolecular structural motifs: the alternative chain for the ternary complex 1 and two types of capsules for complexes 2-4 where the DTU dimers are encapsulated inside the space restricted by two crown molecules.
    關聯: Journal of Inclusion Phenomena and Macrocyclic Chemistry 61(3-4), pp.367-375
    DOI: 10.1007/s10847-008-9431-7
    顯示於類別:[化學學系暨研究所] 期刊論文

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