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Carbon dots (CDs) as a novel type of nanomaterials have attracted significant attention in various scientific communities because of their excellent fluorescence. Herein, green fluorescent CDs (G-CDs) were obtained using one-pot hydrothermal treatment of Lonicera maackii fruit and exhibited excellent fluorescence characteristic and good bio-compatibility. The assynthesized G-CDs displayed strong green fluorescence, which was specifically quenched by Fe3+. And we develop a method for excellent sensitive and selective detection of Fe3+ with a linear range of 0.1-10 μM and a limit of detection of 0.08 μM. The method was further extended to measure the concentration of Fe3+ in actual water samples which the result is satisfactory. The synthesized G-CDs were applied for drawing fluorescent patterns, which may be used for anti-counterfeit. Finally, the prepared G-CDs were used in cell imaging and detection of Fe3+ in live cells. [ABSTRACT FROM AUTHOR]

A two‐step, one‐flask synthesis of central seven‐membered borondifluoride‐3,3‐dimethyl‐2‐[2‐(2‐pyrrolyl)ethenyl] indole (BOPYIN) ligands has been developed by using the unexplored 3,3‐dimethyl‐2‐[2‐(2‐pyrrolyl)ethenyl] indole. The simple synthetic approach has enabled modification of the electronic structure by changing the substituents on the indole unit. X‐ray analysis indicated that conformations of the seven‐membered BF2 complex including BOPYIN and diazaborepin differ from that of the five‐ and six‐membered organoboron complexes. Interestingly, the bond angle of the N⋅⋅⋅B−N bond increases with the number of atoms in the core ring, based on Baeyer strain theory. These unsymmetric BOPYIN derivatives have excellent photophysical properties, including high fluorescence quantum yields, except for BOPYIN‐4 in the solution state, large Stokes shifts, and good molar absorptivity. The dipole moment of BOPYIN‐3 in the first excited singlet state and ground state was demonstrated by a linear Lippert–Mataga plot. The absorption and emission spectra were not mirror images for BOPYIN‐1–3 and 5, in contradiction to Kasha's rule, as determined by TDDFT. The synthesized BOPYINs have been shown to be biocompatible fluorophores in cell bioimaging. [ABSTRACT FROM AUTHOR]