Amino group decorated coordination polymers for enhanced detection of folic acid.

A series of fluorescent coordination polymers (CPs) {[Cd(CH-bpeb)(BDC)] CP1, (BDC)/(NH-BDC)-CP1, (BDC)/(NH-BDC)-CP1, (BDC)/(NH-BDC)-CP1, (BDC)/(NH-BDC)-CP1, (NH-BDC)-CP1} were prepared from conjugated ligand 4,4'-((2-methyl-1,4-phenylene)bis(ethene-2,1-diyl))bipyridine (CH-bpeb), terephthalic acid (BDC), aminoterephthalic acid (NH-BDC) and CdSO under solvothermal conditions. The fluorescence of aqueous suspensions of these CPs was quenched by folic acid (FA) in a concentration dependent manner. The efficiency of quenching increasing with an increased proportion of NH-BDC ligand in the CP with (NH-BDC)-CP1 exhibiting a low detection limit of 1.

Dual-response detection of Ni and Cu ions by a pyrazolopyrimidine-based fluorescent sensor and the application of this sensor in bioimaging.

Herein, a dual-response fluorescent sensor, L, based on pyrazolopyrimidine was designed and developed for the simultaneous detection of Ni and Cu ions in the presence of other metal ions; the structural characterization of L was carried out by FTIR spectroscopy, NMR spectroscopy, HRMS and X-ray diffraction analysis. The sensor L effectively displayed fluorescence quenching towards the Ni and Cu ions with high sensitivity without interference from other metal ions. The results reveal that L binds to Ni and Cu in a 2 : 1 pattern, which matches well with the result of the Job's plot.