Ethylenediamine as a bridging ligand: structure solution of two cadmium(Ⅱ)-based coordination polymers from powder diffraction data

摘要

Structures of [Cd(C_2H_8N_2)Cl_2]n (1) and [Cd(C_2H_8N_2)Br_2]n (2) were solved from powder diffraction data. Compound (1) crystallizes in the space group Pbam (No. 55), a = 9.9021(7) A, b = 7.8186(6) A, c = 4.0705(3) A, V= 315.13(3) A~3, Z = 2. (2) is isostructural: space group Pbam (No. 55), a = 10.405 (2) A, b = 7.8634(8) A, c = 4.2079(5) A, V= 344.28(6) A~3, Z=2. The investigated compounds are examples of two-dimensional hybrid coordination polymers, in which neighboring metal centers are bridged via both organic and inorganic moieties: ethylenediamine molecules and halide anions. Both crystal structures were solved ab initio from powder data using direct methods.