Preliminary Study on the Synthesis of Co(II)-tartrate-nicotinamide Coordination Polymer as Functional Porous Materials
Yuniar Ponco Prananto[1]*, Tutik Setianingsih[1], Sasti Gona Fadhilah[1], Dea Amini Khaujakiya[1], Rafi Dwiasis Wibisono[1]

[1] Department of Chemistry, Brawijaya University, Malang (prananto[at]ub.ac.id).

Abstract

Incorporation of nicotinamide and tartrate mixed ligand into Co(II) coordination polymer as functional porous materials is being studied. Initial attempt by a layered solution technique in water-methanol solvent system with excess amount of nicotinamide resulting in Co(II)-tartrate complex only. Hence, to obtain the targeted complex of Co(II)-tartrate-nicotinamide or Co(II)TN, a direct mix technique using dimethylformamide as solvent was proposed in this work. The reactions were performed at 80C 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 characterised by infrared spectroscopy and melting point test. Experimental data shows that the proposed reaction recipes did not successfully produced 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 (red purple) and the nitrate (dark brown) salts. Analysis of melting point test suggest that the Co(II)-tartrate obtained from the acetate salt is different to that of the nitrate salts. This tartrate vs nicotinamide ligand preference due to the use of different Co(II) salt are unexpected and still being investigated.

Keywords: metal complex, coordination polymers, ligand preference, niacinamide, anion effect.

Topic: Materials Sciences: Synthetic and Characterization