16230-63-0Relevant articles and documents
Environmentally friendly synthesis of flexible MOFs M(NA)2 (M = Zn, Co, Cu, Cd) with large and regenerable ammonia capacity
Chen, Yang,Shan, Bohan,Yang, Chengyin,Yang, Jiangfeng,Li, Jinping,Mu, Bin
, p. 9922 - 9929 (2018)
Two environmentally friendly and efficient synthesis methods, NH3-assisted synthesis and solvent-evaporated conversion, have been developed for the synthesis of a series of M(NA)2 (M = Zn, Co, Cu, Cd; NA = nicotinate) flexible MOFs. The two-dimensional M(NA)2 (M = Zn, Co) and three-dimensional M(NA)2 (M = Cu, Cd) materials exhibit peculiar structural transformation. These frameworks can be obtained from dehydration of M(NA)2(H2O)4 (M = Zn, Co, Cu, Cd) which are zero-dimensional supramolecular structures. Interestingly, the structural transformation of M(NA)2 (M = Zn, Co, Cd) is reversible after liquid water adsorption. Due to the flexible structure of these MOFs, they exhibit abnormal NH3 adsorption properties. The two-dimensional Zn(NA)2 shows a gate-opening behavior for NH3 adsorption. Its layers opened at a pressure of 0.22 bar in the first cycle, resulting in a two-step NH3 uptake with a capacity of 10.2 mmol g-1 at 1 bar. The gate-opening pressure shifted to a lower value with cycles. Co(NA)2 has a huge NH3 uptake of 17.5 mmol g-1, which is top-ranking among the reported values. For the NH3 adsorption over Cu(NA)2 and Cd(NA)2, the adsorption rates increase and adsorption equilibrium is achieved faster after three cycles. Their maximum capacity at 1 bar is 13.4 and 6 mmol g-1, respectively. More importantly, all MOFs can be regenerated under vacuum and heating conditions of 150 °C for 70 min, and they all retained the capacity. The advantages of environmentally friendly synthesis, large adsorption capacity, and regenerable properties indicate that M(NA)2 (M = Zn, Co, Cu) are promising candidates for NH3 adsorption.
Raman spectra of copper, cobalt, and nickel complexes of nicotinic acid: Equilibrium studies
Fazary, Ahmed E.,Bani-Fwaz, Mutasem Z.,Fawy, Khaled F.,Sahlabji, Taher,Awwad, Nasser S.,Abd-Rabboh, Hisham S.M.
, p. 459 - 467 (2018)
This article summarizes the protonation and complexation equilibrium constants of nicotinic acid (NA) using different analytical techniques and software’s. Additionally, Raman, IR, and NMR spectra were done for nicotinic acid ligand and for its solid complexes with copper(II), cobalt(II) and nickel(II) metal ions.
Electrochemical Synthesis and Characterization of Copper(II) and Zinc(II) Coordination Compounds with Nicotinic and Picolinic Acids
Andriychenko, E. O.,Bespalov, A. V.,Bovyka, V. E.,Bukov, N. N.,Zelenov, V. I.
, p. 1697 - 1705 (2021/11/01)
Abstract: New methods for the electrochemical synthesis of copper(II) and zinc(II) coordination compounds with pyridinecarboxylic acids (nicotinic and picolinic) have been developed. The resulting compounds were characterized by quantitative analysis and IR spectroscopy. The vibrational frequencies of the synthesized compounds were calculated by a DFT quantum-chemical method, and the experimental IR spectra were interpreted on this basis. It was found that pyridinecarboxylate ions in all cases are coordinated both at the nitrogen atom and at the carboxylate group, however, in the case of nicotinic acid, this leads to the formation of coordination polymers, whereas for picolinic acid, the formation of mononuclear complexes is typical.
