Copper(I) thiocyanate coordination polymers with dimethylpyrazine: synthesis, crystal structures, thermal and luminescence properties

Add time:08/04/2019    Source:sciencedirect.com

The new copper(I) coordination polymers poly[(di-μ2-thiocyanato-N,S)-(μ2-2,5-dimethylpyrazine-N,N)] dicopper(I) (I) and poly[di-μ2-thiocyanato-N,S)-(μ2-2,3-dimethyl-pyrazine-N,N)] dicopper(I) (II) were prepared by the reaction of COPPER(I) THIOCYANATE (cas 18223-42-2) with 2,3- and 2,5-dimethylpyrazine in acetonitrile. In all compounds different CuSCN sub-structures are found which are connected by the dimethylpyrazine ligands to multi-dimensional coordination networks. The thermal properties of all compounds were investigated using simultaneous differential thermoanalysis (DTA), thermogravimetry (TG) and mass spectrometry (MS) as well as temperature resolved X-ray powder diffraction. On heating, compound I and II loose all of the dimethylpyrazine ligands in an endothermic reaction and transform directly into copper(I) thiocyanate. Optical investigations show two excited states for both compounds in absorption and in luminescence measurements which are both, MC and LMCT in character.

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