Yu-Zhou Wang

Novel Fluorescent Molecular Clips: Selective Recognition Towards Fe3+ in Aqueous Solution

In this paper, we report the synthesis, characterization and Fe3+-sensing properties of a series of new artificial fluorescent molecular clips, and structure of clip 1 is confirmed by X-ray crystallography. All these molecular clips had the ability to bind and sense Fe3+ selectively through decrease fluorescence responses in THF-MeOH-Water. Fluorimetric titration experiment indicated that the quenching of these compounds’ fluorescence upon Fe3+ probably arises from the electron/energy transfer between Fe3+ and the excited chemosensors. The limit of detection, linear concentration range and selectivity of the fluorescent molecular clips were evaluated in this study as well.

13b,13c-Di-2-pyridyl-5,7,12,13b,13c,14-hexa­hydro-6H,13H-5a,6a,12a,13a-tetra­azabenz[5,6]azuleno[2,1,8-ija]benz[f]azulene-6,13-dione methanol hemisolvate

The title compound, C30H24N6O2·0.5CH3OH, a glycoluril derivative with two pyridine substituents on the convex face of the glycoluril system, is an important intermediate for the synthesis of more complex glycoluril derivatives. The compound crystallizes with two independent molecules in the asymmetric unit, one of which exhibits disorder of one benzene ring over two orientations with refined site occupancy factors 0.65 (4):0.35 (4). The crystal structure contains several short C—H⋯O contacts, and the methanol molecule forms an O—H⋯O hydrogen bond to one of the glycoluril molecules.

3α,6α-Bis(ethoxy-carbon-yl)glycoluril (diethyl 2,5-dioxoperhydro-imidazo[4,5-d]imidazole-3a,6a-dicarboxyl-ate).

The title compound, C10H14N4O6, crystallizes with two independent molecules in the asymmetric unit. An extensive network of N—H⋯O and C—H⋯O intermolecular hydrogen bonds stabilizes the crystal packing. One ethyl group is disordered over two positions; the site occupancy factors are 0.68 and 0.32.

(Z)-2-Methyl­sulfanyl-1,4-di-p-tolyl­but-2-ene-1,4-dione

The title compound, C19H18O2S, displays a trans configuration with respect to the central C=C double bond. The dihedral angle between the two aromatic rings is 67.91 (5)°.