A soft template-assisted self-assembly (STAS) strategy was developed to grow large-area high-quality 2D molecular crystals on a water surface irrespective of the surface tension of the solvents.
Two-dimensional molecular crystals with a defined number of molecular layers were produced by a layer-defining strategy of crystal growth on a liquid substrate, reported by R. Li, W. Hu, et. al in their Communication on page 16082 ff. By controlling the spreading of the solution on the liquid surface, large-area quasi-freestanding two-dimensional molecular crystals can be obtained ranging from bulk size down to the monolayer limit. This method allows the layer-dependent optoelectronic properties of organic semiconductors to be probed.
Low-voltage OFETs with excellent mobility, steep subthreshold swing, and low operating voltage were achieved simultaneously based on a novel solution-processable high- k dielectric.
A method for the determination of nine biogenic amines (BAs) in wine was established using ion chromatography-tandem mass spectrometry (IC-MS/MS) without derivatization. BAs were separated by a cation exchange column (IonPac CG17, 50 mm × 4 mm, 7 µm) with a gradient aqueous formic acid elution. Good linearity was obtained for nine BAs with coefficients of determination (R2) > 0.9972 within the range of 0.01-50 mg/L. The limits of detection and quantification were within the ranges of 0.6-40 µg/L and 2.0-135 µg/L, respectively, with the exception of spermine (SPM). The recoveries were demonstrated within the range of 82.6-103.0%, with relative standard deviations (RSDs) of less than 4.2%. This simple method featuring excellent sensitivity and selectivity was suitable for the quantification of BAs in wines. The occurrence of BAs in 236 wine samples that are commercially available in China was determined. The BA levels in wines of different geographical origins varied significantly. The acute dietary exposure assessment of BAs was carried out by calculating the estimated short-term intake (ESTI) and comparing the acute reference dose (ARfD) specified by the European Food Safety Authority (EFSA). Results showed that the exposure to histamine (HIS) and tyramine (TYR) via the consumption of wines was much lower than the recommended ARfD level for healthy individuals. However, exposure could lead to symptoms in susceptible individuals. These results provided basic data regarding the occurrence and risk of BAs in wines for wine production, health guidance and consumer safety.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
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