Preliminary study on the synthesis of Co(II)-tartrate-nicotinamide coordination polymer as functional porous materials.

Incorporation of nicotinamide and tartrate mixed ligand into Co(II) coordination polymer as functional porous materials is being studied. Initial attempt by layered solution technique in water-methanol solvent system with excess amount of nicotinamide resulting in Co(II)-tartrate complex only. Other method to obtain the targeted complex of Co(II)-tartrate-nicotinamide or CoTN by direct mix technique using dimethylformamide as solvent is proposed in this paper. The reactions were performed at 80 °C in Co(II):T:N molar ratios of 1:1:2 and 1:1:4 and using several Co(II) salts, namely chloride, acetate, and nitrate. All precipitated products were characterized by infrared spectroscopy and melting point test. Experimental data shows that the proposed reaction recipes did not successfully produce the targeted Co(II)TN complex, which presumably due to the reaction may needs higher temperature and/or pressure. Thus, solvothermal method is recommended for the next attempt. Interestingly, the use of different salt of Co(II) lead to different products, which is never been reported before. Pale purple complex of Co(II)-nicotinamide was yielded from the chloride salt, whereas complexes of Co(II)-tartrate was produced from the acetate and the nitrate salts. Melting point test suggests that the Co(II)-tartrate obtained from the acetate salt is different to that of the nitrate salts. This tartrate vs nicotinamide ligand preference within the same type of metal center, due to the use of different anion of the Co(II) salt, is unprecedented and still being investigated. [ABSTRACT FROM AUTHOR]