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The utilization of a stable 2D bilayer MOF for simultaneous study of luminescent and photocatalytic properties: experimental studies and theoretical analysis

Wu, Xiren, Shen, Xin, Fan, Shuran, Trivedi, Manoj, Li, Boahong, Kumar, Abhinav, Liu, Jianqiang
RSC advances 2018 v.8 no.42 pp. 23529-23538
2,4-dinitrophenol, carboxylic acids, dyes, ions, iron, lead, ligands, light intensity, nitroaromatic compounds, nitrophenols, photocatalysis, photoluminescence, photolysis, wastewater
A new Pb(ii)-based 2D MOF comprising π-conjugated ligand 4′-(1H-tetrazol-5-yl)-[1,1′-biphenyl]-3,5-dicarboxylic acid (TZBPDC) and having the formula {[PbNa(TZBPDC)](H₂O)(DMF)₂}ₙ (1) has been synthesized. Structural characterization of 1 indicates that the MOF has a 4-connected (4,4) motif. The photoluminescent investigation indicates that 1 can behave as potential luminescent sensor for the detection of nitroaromatic compounds (NACs), especially 2,4-dinitrophenol (2,4-DNP) and ferric ions, through the decrease in its luminescence intensity. Additionally, 1 also displays excellent capacity for the photodegradation of methylene orange (MO), which is a constituent of wastewater discharge. The most plausible mechanisms for the decrease in the luminescent intensity of 1 in the presence of different NACs have been explored though theoretical calculations, and the photocatalysis of 1 for organic dyes has been addressed using density of states (DOS) and partial DOS calculations.