TNP [LPS]

The development of an analytical probe to monitor highly mutagenic picric acid (PA) carries enormous significance for the environment and for health. A novel, simple and rapid fluorescence analytical assay using sulfur-doped graphene quantum dots (SGQDs) was designed for the highly sensitive and selective detection of PA. SGQDs were synthesized via simple pyrolysis of 3-mercaptopropionic acid and citric acid and characterized using advanced analytical techniques. Fluorescence intensity (FI) of SGQDs was markedly quenched by addition of PA, attributed to the inner filter effect and dominating static quenching mechanism between the two, in addition to a significant colour change. The calibration curve of the proposed assay exhibited a favourable linearity between quenched FI and PA concentration over the 0.1-100 mu M range with a lowest detection limit of 0.093 mu M and a correlation coefficient of 0.9967. The analytical assay was investigated for detection of trace amounts of PA in pond and rain water samples and showed great potential for practical applications with both acceptable recovery (98.0-100.8%) and relative standard deviation (1.24-4.67%). Analytical performance of the assay in terms of its detection limit, linearity range, and recovery exhibited reasonable superiority over previously reported methods, thereby holding enormous promise as a simple, sensitive, and selective method for detection of PA.

Two new metal-organic frameworks (MOFs), [Zn-2(mu(3)-OH)(dia)(btb)center dot 2H(2)O]center dot EtOH center dot 0.5DMF (1) and [Cd2Na(btb)(2)(dia)(2)]center dot 2DMF center dot H2O (2) (dia = 9,10-bis(1H-imidazol-1-yl)anthracene, btb = 1,3,5-tris(4-carboxyphenyl)benzene), have been synthesized under solvothermal conditions. Compound1exhibits a (3,10)-connected net based on {Zn-4} SBUs and compound2presents a (3,8)-connected network with a [Cd2Na] unit. The results show that both1and2have a microporous structure and selective adsorption capacity for CO2, and theQ(st)value is 36 kJ mol(-1)and 35 kJ mol(-1), respectively. Studies on luminescence sensing show that1and2are highly selective and recyclable in the detection of nitroaromatic explosives, especially for TNP. It is noteworthy that the quenching constantK(sv)of1and2for TNP (2.84 x 10(5)M(-1)and 2.50 x 10(5)M(-1)) is higher than that of most reported compounds.