Synthesis and thermal properties of the inorganic-organic transition metal halogenides CuCl-pyrazine and Cu2Cl2-pyrazine

The coordination polymers CuCl-pyrazine and Cu2Cl2-pyrazine were synthesised by the reaction of CuCl with pyrazine in aqueous solution under hydrothermal conditions. Using an excess of pyrazine, phase pure CuCl-pyrazine can be prepared in high yield. On lowering the pyrazine excess only a small amount of Cu2Cl2-pyrazine can be obtained as a phase mixture with CuCl-pyrazine. Phase pure Cu2Cl2-pyrazine can only be synthesised via thermal decomposition of CuCl-pyrazine. This reaction was investigated using simultaneously difference thermal analysis and thermogravimetry measurements (DTA-TG). mass spectrometry. thermomicroscopy and temperature resolved X-ray powder diffraction. (C) 2001 Elsevier Science Ltd. All rights reserved.