Synthesis, Structure, Physical Properties Thiapyrazinophane And Complexation

Since the fifties of last century, the phane compounds, particularly those heteroatom-bridged cyclophane compounds have attracted much attention and been investigated some chemists because of their unusual geometry and intriguing features. As increasing the selectivity and specificity of guest molecules for complexation is the replacement of carbon donor atoms by heteroatiom atoms. For this reason,In supramolecular chemistry field which also got great development and expanded to a different level.To further enrich the structure and spectroscopy of the pyrazinephane in cyclophane, this paper show the title compounds have been synthesized by the reaction of 2,6-bis(chloromethyl)pyrazine with sodium sulfide under high-dilution conditions and increased yield by joining 1,4-butanediamine dichloride, changed elution agents ratio. The same time we reports first successful synthesis of compound 2,11,20,29,38-pentathia[3.3.3.3.3](2,6)pyrazinophane, its molecular struture by the 1H-NMR and 13C-NMR, mass spectra, and X-ray crystal analysis. We used 2,11-dithia[3.3](2,6)pyrazinophane as ligand to synthesize coordination compounds with Mn(II) through liquid diffusion and characterized by X-ray crystallography. Results show that part conformation of complexes was the same with ligand [syn(boat-chair)]. Mn(II) participate in the coordination with two nitrate ions and two water molecules and one nitrogen atoms of a pyrazinophane molecule formed a five slots double taper the triangle of ligand field. two pyrazine interplanar separation is 13.8o. Intermolecular formed the three-dimensional space layer structure through hydrogen bond,π…πstacking interactions, weak interaction by S…S bonds. To the best of our knowledge, these metal complexes are the first examples. In addition, the thermogravimetric analysis of complexe 45 was studied. Results show that its decomposition was three stages. The variable temperature magnetic susceptibility of complex 45 indicates the existence of intermolecular weak antiferromagnetic interaction at low temperature. UV/vis and Flurorescence spectra were also studied at target pyrazinophane compounds in this paper. Strong bathochromic shifts and hyperchromic effects were observed as the pyrazine unit compared with 2,6-dimethylpyrazine, whereas the magnitude increases with an increase in the number of rings. Broader excimer bands were seem at 450nm-650nm in flurorescence spectra.