作者:Nikolaos C. Papandreou、Stella Makedonopoulou、Ekaterini A. Antoniadou-Vyza、Irene M. Mavridis、Stavros J. Hamodrakas
DOI:10.1107/s0108270102019108
日期:2002.12.15
The title salt, C18H22N5+.Cl-, is a member of a new series of lipophilic 4,6-diamino spiro-s-triazines which are potent inhibitors of dihydrofolate reductase. The protonated triazine ring deviates from planarity, whereas the cyclohexane ring adopts a chair conformation. A rather unusual hydrogen-bonding scheme exists in the crystal. There is a centrosymmetric arrangement involving two amino groups and two triazine ring N atoms, with graph-set R-2(2) (8) and an N...N distance of 3.098 (3) Angstrom, flanked by two additional R-3(2) (8) systems, involving two amino groups, a triazine ring N atom and a Cl- anion, with N...Cl distances in the range 3.179 (2)- 3.278 (2) Angstrom. Furthermore, the Cl- anion, the protonated triazine ring N atom and an amino group form a hydrogen-bonding system with graph-set R-2(1) (6).