title: 2,4-dithiouracil: the reproducible H-bonded structural motifs in the complexes with 18-membered crown ethers.
abstract: 2,4-dithiouracil (DTU) forms in the crystals the H-bonded monohydrates of a 1:1:1 ratio with 18-crown-6 (18C6) 1, cis,syn,cis-isomer of dicyclohexano-18-crown-6 (DCH6A) 2, and benzo-18-crown-6 (B18C6) 3, while the anhydrous adduct with cis,anti,cis-isomer of dicyclohexano-18-crown-6 (DCH6B) 4 is of a 2:1 ratio. In 1-3 the components reproducibly alternate in the chains, while in 4 the chains are built of the alternative centrosymmetric dimers of 2,4-dithiouracil and the molecules of the cis,anti,cis-isomer of dicyclohexano-18-crown-6.
authors.affiliation: Department of Chemistry, Tamkang University, 151 Ying-Chuan Road, Tamsui, Taipei, 25137, Taiwan, ROC.
authors.forename: Wen-Jwu
authors.initials: WJ
authors.lastname: Wang
authors.forename: Eduard V
authors.initials: EV
authors.lastname: Ganin
authors.forename: Marina S
authors.initials: MS
authors.lastname: Fonari
authors.forename: Yurii A
authors.initials: YA
authors.lastname: Simonov
authors.forename: Gabriele
authors.initials: G
authors.lastname: Bocelli
mesh_terms: D043844:Crown Ethers / Q000737:chemistry*; D006860:Hydrogen Bonding; D013889:Thiouracil / Q000031:analogs & derivatives* / Q000737:chemistry
chemical_list: D043844:Crown Ethers; C056582:2,4-dithiouracil; D013889:Thiouracil