Hydrothermal synthesis and structure of an unprecedented layered Cd-citrate complex containing helical chains

An exploration of the cadmium-citrate system under hydrothermal conditions, has led to the isolation of a novel framework [Cd3(H2O)2(C6H5O7)2]n1. This compound features a novel 2D undulated sheet containing infinite double-stranded helical chains, which is unique among metal-citrate system identified so far. Crystal data for compound 1: Monoclinic, Space group P21/c, a=6.0974(12)  Å, b=15.271(3) Å, c=9.781(2) Å, β=102.74(3)°, V=888.3(3) Å3, Z=2. Other characterizations by elemental analysis, IR and TG are also described.