Structures of tetrachlorometalates [Zn(II) and Hg(II)] of trimethylene-bisadeninium
摘要:
The X-ray structure of outer sphere complexes [(H-Ade)(2)(CH2)(3)]ZnCl4-H2O 1 and [(H-Ade)(2)(CH2)(3)]HgCl4. H2O 2 are reported (Ade = adenine). The conformation of the bis-adeninium dication depends on the characteristics of the anion partner. Thus, while in 1, an eclipsed and parallel (based on the direction of the two bis-adeninium moieties) conformation is present; 2 posses a gauche and antiparallel disposition. Although 1 and 2 present identical pattern of hydrogen bonds between the ligand and the tetrachlorometalate(II) anion, stacking interactions between purine rings are observed only in 1. Chelated hydrogen bonds (cis-MCl2... HN+) are not detected. (C) 1999 Elsevier Science Ltd. All rights reserved.