A coumarin TCF-based water-soluble near-infrared fluorescent probe was presented, which could be used for the rapid, colorimetric and ratiometric detection of SO2 derivatives with a detection limit of 0.27 nM. Moreover, this probe could successfully image the analyte in living cells.

A multifunctional fluorescent sensor based on a cyclen-appended BINOL derivative (R-1) was synthesized and characterized. It can display on-off-type fluorescence change with high selectivity toward Cu(II) among 19 metal ions in 100% aqueous solution. Furthermore, the in situ generated R-1-Cu(II) ensemble could recover the quenched fluorescence upon the addition of sulfide anion resulting in a off-on-type sensing with a detection limit of micromolar range in the same medium. No interference was observed from other biothiols and anions, including GSH, l-Cys, DTT, and sulfates, making it a highly sensitive and selective sulfide probe.

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Stable configurations, electronic structures, and magnetic behaviors for N, O, and F absorptions on graphene have been investigated by first-principles calculations. It is found that F atom is located just above the C atom, while both O and N atoms are located above the carbon-carbon bond. Strong interactions between absorbers and C atoms exist. N adatom has an unsaturated electron and its electrons are polarized, inducing 0.84 μB magnetic moment per N atom for graphene, while both F and O adatoms do not have polarized electrons, which results in no net magnetic moment. Possible mechanisms were discussed for different magnetic behaviors of graphene absorbed with N, O, and F atoms. We find that the p-type doping of graphene by N atom can result in strongly spin-polarized impurity states, which may lead to a possible pathway to high temperature magnetic order in graphene.

A reaction-based colorimetric and ratiometric fluorescent probe based on an ICT-strategy for selective detection of H(2)S that exploited the H(2)S-mediated reduction of nitrocompound to amines was explored. And it displayed high selectivity for H(2)S over other relevant reactive sulfur, oxygen, nitrogen species and other anions with more than 120 nm blue shift and the change of emission intensity ratio inducted by H(2)S was over 4750.