S. Menzer, E. C. Hillgeris, B. Lippert
Sep 15, 1993
Citations
0
Influential Citations
14
Citations
Journal
Inorganica Chimica Acta
Abstract
Abstract The coordination of HgCl2 to 9-ethylguanine, 1,9-dimethylguanine and 2-amino-6-methoxy-9-methylpurine (6,9- dimethylguanine) has been studied. The X-ray structures of the complexes HgCl2 (2-amino-6-methoxy-9-methyl- purine-N7) (1) (monoclinic, P21/m, a=10.160(3), b=6.222(1), c=11.060(3) A, β=116.11(2)°, Z=2) and {[HgCl2·(1,9- dimethyl-guanine-N7)]2HgCl2}n (2) (orthorhombic, Pbca, a=6.955(2), b=17.176(6), c=21.829(9) A, Z=4) are reported. Binding of HgCl2 is through N7 of the purine bases. In 1 discrete molecules are formed, while 2 is a linear polymer with (HgCl)n chains to which the guanine bases and chloro ligands are coordinated. The solution behavior is characterized by a rapid ligand exchange and low complex formation constants, log β1=0.4 (1), 1.3 (1:1 adduct of 2) and 1.0 [HgCl2·9-EtGH] (3).