Hydrothermal synthesis, structure and photoluminescent property of a novel sodium-pyrazinyltetrazole framework compound

A novel coordination polymer of sodium [Na2(Pzta)2(H2O)2]n (1) has been synthesized hydrothermally by reacting pyrazine carbonitrile and sodium azide in the presence of aluminum(III) chloride as Lewis acid catalyst. Complex 1 was characterized by elemental analysis, thermal gravimetric analysis and IR spectroscopy. Single crystal X-ray diffraction revealed that complex 1 has both distorted trigonal bipyramidal and square pyramidal coordination geometries around sodium atoms. Complex 1 represents the first hydrothermally synthesized 1D sodium monotetrazole coordination polymer. Strong hydrogen bonds are formed between water molecules and nitrogen atoms of both pyrazine and tetrazole rings which result in the formation of a 2D metallosupramolecular network. The luminescence properties of 1 were also investigated at room temperature in the solid state.

A novel coordination polymer of sodium [Na2(Pzta)2(H2O)2]n (1) has been synthesized hydrothermally by reacting pyrazine carbonitrile and sodium azide in the presence of aluminum(III) chloride as Lewis acid catalyst. Single crystal X-ray diffraction revealed that complex 1 has both distorted trigonal bipyramidal and square pyramidal coordination geometries around sodium atoms. Complex 1 represents the first hydrothermally synthesized 1D sodium monotetrazole coordination polymer. Strong hydrogen bonds are formed between water molecules and nitrogen atoms of both pyrazine and tetrazole rings which result in the formation of a 2D metallosupramolecular network. The luminescence properties of 1 were also investigated at room temperature in the solid state.Figure optionsDownload as PowerPoint slideResearch highlights
► Complex 1 has high thermal stability and is virtually insoluble in most common solvents such as acetone, methanol, chloroform, benzene, water etc. along with the impressive emission properties making it a potential photoactive material.
► In the polymeric structure of 1, hydrogen bonds working in cooperativity with covalent interactions are capable of ‘maneuvering’ complex ions into desirable motifs.
► This is the first report in the family of sodium tetrazolate MOFs where the metal has both square pyramidal and trigonal bipyramidal geometries.