2,4-dithiouracil: the reproducible H-bonded structural motifs in the complexes with 18-membered crown ethers.
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.
Wang
Wen-Jwu
WJ
Department of Chemistry, Tamkang University, 151 Ying-Chuan Road, Tamsui, Taipei, 25137, Taiwan, ROC.
Ganin
Eduard V
EV
Fonari
Marina S
MS
Simonov
Yurii A
YA
Bocelli
Gabriele
G
D043844:Crown Ethers / Q000737:chemistry*; D006860:Hydrogen Bonding; D013889:Thiouracil / Q000031:analogs & derivatives* / Q000737:chemistry
D043844:Crown Ethers; C056582:2,4-dithiouracil; D013889:Thiouracil