Synthesis and thermal properties of the inorganic-organic transition metal halogenides CuCl-pyrazine and Cu_2Cl_2-pyrazine

摘要

The coordination polymer CuCl_pyrazine and CuCl_2-pyrazine were synthesised by the reaction of CuCl_2 with pyrazine in aqueous solution under hydrothermal conditions. Using an excess of pyrazine, phase CuCl-pyrazine can be prepared in high yield. On lowering the pyrazine excess only a small amount of Cuc_2Cl_2-pyrazine can be obtained as a phase mixture with CuCl-pyrazine. Phase pure Cu_2Cl_2-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 resoved X-ray powder diffraction.