Structures and Properties of Three Solvent-Dependent Chiral Compounds Based on N-Benzoyl-L-glutamic Acid

Three solvent-dependent chiral copper（II） compounds, {[Cu2（bzgluO）2（HzO）2]-4HzO}n （1）, {[Cu2（bzgluO）2-（DMSO）2].H2O}, （2） and [Cuz（bzgluO）2（DMF）2], （3） （H2bzgluO=N-benzoyl-L-glutamic acid） have been synthe-sized under ambient temperature conditions and characterized by elemental analysis, IR spectra, UV spectra, ther- mogravimetric analysis, powder X-ray diffraction （PXRD） and single-crystal X-ray diffraction. Compounds 1 and 2 both crystallize in the orthorhombic space group P212121. Compound 3 crystallizes in the tetragonal space group P43. Compound 1 exhibits a ladder-like 1D chain structure, which is extended by hydrogen-bonding interactions to form a 3D supramolecular network. Compounds 2 and 3 both give a diamond-like 3D structure. Besides, there are hydrogen-bonding interactions in 2. The structural difference indicates that the solvent system plays a crucial role in modulating structures of coordination compounds. Circular dichroism （CD） and the magnetic properties of the compounds have also been investigated.

Synthesis of carbon dots with a tunable photoluminescence and their applications for the detection of acetone and hydrogen peroxide

Carbon dots(CDs) with multi-color emissive properties and a high photoluminescent quantum yield(PLQY) have attracted great attention recently due to their potential applications in chemical,environmental,biological and photo-electronic fields.Solvent-dependent effect in photoluminescence provides a facial and effective approach to tune the emission of CDs.In this study,green emissive nitrogen-doped carbon dots(N-CDs) are synthesized from p-hydroquinone and ethylenediamine through a simple hydrothermal method.The as-prepared N-CDs possess a robust excitation-independent green luminescence and a high PLQY of up to 15.9%.Further spectroscopic characterization indicates that the high PLQY is achieved by the balance of nitrogen doping states and the surface passivation extent in CDs.The N-CDs also exhibit solvent-dependent multi-color emissive property and distinct PLQY in different solvents(the maximum can reach up to 25.3%).Furthermore,the as-prepared N-CDs are applied as fluorescence probes to detect acetone and H2O2 in water.This method has exhibited a low detection limit of acetone(less than 0.1 %) and a quick and linear response to the H_2O_2 with the concentration from 0 to 120 μmol/L.This work broadens the knowledge of applying CDs as probes in the bio and chemical sensing fields.