Structure characterization of 1:1 adducts of metal(II) halides and piperazine

From the simple hydro/solvothermal reactions, two 1:1 adducts of MX2 and piperazine (pip) [CdI2(pip)] 1 and [CoCl2(pip)] 2 were prepared. Both were characterized by elemental analyses, IR spectra, ultra-violet visible spectra, thermogravimetric analyses and X-ray single-crystal diffraction. With pip as the bridges, the 1-D linear CdI2 chains are extended into a 2-D layered compound 1, while the mononuclear CoCl2 units are linked into a 1-D zigzag-type chain compound 2. The fluorescence emission spectrum indicates that compound 1 possesses fluorescence property with the peaks at 373 nm (image) and 410 nm (image).