Synthesis, crystal structures, and properties of the copper(I) halide coordination polymers (2)(infinity)[CuX(mu-2-chloropyrazine-N,N ')] (X = Cl, Br), (1)(infinity)[CuI(2-chloropyrazine-N)], and [Cu2I2(2-chloropyrazine)]

摘要

The new copper coordination polymers (2)(infinity)[CuX(mu-2-chloropyrazine-N,N')] (X = Cl (I), Br (II), (1)(infinity)[Cul(2-chloropyrazine-N)] (III) and [Cu2I2(2-chloropyrazine)] (IV) has been prepared by the reaction of the copper(I) halides with 2-chloropyrazine at room-temperature or under hydrothermal conditions. The crystal structures of the 1:1 compounds I and II consist of ,,zig-zag'' CuX single chains running parallel to the crystallographic a-axis which are linked by the 2-chloropyrazine spacer molecules to sheets parallel to (010). For the iodine compound III a one-dimensional structure is found which consists of CuX double chains running parallel to the crystallographic a-axis. The thermic, properties of all compounds were investigated in different gas atmospheres using simultaneously differential thermal analysis and thermogravimetry (DTA-TG) as well as temperature resolved X-ray powder diffraction. On heating, the 1:1 compounds I and II decompose directly to the corresponding copper(I) Halides, whereas the thermal decomposition of III occcur via IV as an intermediate. [References: 38]