2D polymeric copper(I) complexes. Synthesis and characterizations of [Cu(pyza)(2)X](n) (X = CN, NCS and N-3, and pyza = pyrazinecarboxamide) and X-ray crystal structures of the cyano and thiocyanato complexes

Three new copper(I) complexes of the type Cu(pyza)(2)X, (X = CN(1)- NCS(2) and N-3: pyza = pyrazinecarboxamide) have been prepared and characterized b y spectroscopic and single crystal analyses showing 2D polymeric structures . The electronic, IR and Raman spectra of the cyano and thiocyanato complex es are measured and discussed. The structures of 1 and 2 are very similar f eaturing end-to-end bridging CN or NCS groups. forming chains connected via hydrogen bonds between the monodentate pyza of these complexes. Complex 2 displays solid state visible emission spectra when irradiated in the UV reg ion at room temperature.