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

The coordination polymers CuCl-pyrazine and Cu2Cl2-pyrazine were synthesise d by the reaction of CuCl with pyrazine in aqueous solution under hydrother mal conditions. Using an excess of pyrazine, phase pure CuCl-pyrazine can b e prepared in high yield. On lowering the pyrazine excess only a small amou nt of Cu2Cl2-pyrazine can be obtained as a phase mixture with CuCl-pyrazine . Phase pure Cu2Cl2-pyrazine can only be synthesised via thermal decomposit ion of CuCl-pyrazine. This reaction was investigated using simultaneously d ifference thermal analysis and thermogravimetry measurements (DTA-TG). mass spectrometry. thermomicroscopy and temperature resolved X-ray powder diffr action. (C) 2001 Elsevier Science Ltd. All rights reserved.