A convenient and efficient approach for the formation of nitrogen heterocycle-fused imidazo[1,2-a]pyridine and benzo[b]selenophenes has been developed through copper-catalyzed direct selenylation of readily available 2-(2-bromophenyl)imidazo[1,2-a]pyridines via regioselective cleavage of C(sp)-Br and C(sp)-H bonds using readily available selenium powder as the selenylating reagents under ligand- and base-free conditions in air. Preliminary mechanistic investigations indicated that radical species were involved in the present transformation.

Metal‐organic framework (MOFs) nanofilm offer new perspectives as active layers in memristor devices due to their large surface area, high chemical and thermal stability, permanent porosity, and tunable structure. Though various methods are reported for the preparation of MOF nanofilms, the development of new methods to improve the quality is still essential toward their broader and large‐scale application. Herein, Cu3(HHTP)2 (HHTP = 2, 3, 6, 7, 10, 11‐hexahydroxytriphenylene) nanofilms with a large lateral dimension, high homogeneity, and controllable thickness (from 45 to 130 nm) are prepared at the air–liquid interface and further applied in memory devices. The device exhibits a forming‐free, superior retention (1.2 × 104 s) performance with low power consumption and reliability. Kelvin probe force microscopy (KPFM) is applied to gain an insight into the switching mechanism. Herein, a facile and effective method for the preparation of MOF nanofilms is provided and the potential application of MOFs in electronic devices is further proved.

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Despite the remarkable synthetic accomplishments in creating diverse polycyclic aromatic hydrocarbons with B−N bonds (BN‐PAHs), their optoelectronic applications have been less exploited. Herein, we report the achievement of high‐mobility organic semiconductors based on existing BN‐PAHs through a “periphery engineering” strategy. Tetraphenyl‐ and diphenyl‐substituted BN‐anthracenes (TPBNA and DPBNA, respectively) are designed and synthesized. DPBNA exhibits the highest hole mobility of 1.3 cm2 V−1 s−1 in organic field‐effect transistors, significantly outperforming TPBNA and all the reported BN‐PAHs. Remarkably, this is the first BN‐PAH with mobility over 1 cm2 V−1 s−1, which is a benchmark value for practical applications as compared with amorphous silicon. Furthermore, high‐performance phototransistors based on DPBNA are also demonstrated, implying the high potential of BN‐PAHs for optoelectronic applications when the “periphery engineering” strategy is implemented.

A simple approach was developed to fabricate large-area homogeneous GDY films at an air/water interface; the obtained GDY films exhibit steady nonvolatile resistance switching behavior with excellent data retention capability and high on/off ratio.

Here, two large-area microporous polymer (MP) films with different substituents were synthesized at the solution/air interface.

Despite the remarkable synthetic accomplishments in creating diverse polycyclic aromatic hydrocarbons with BÀ N bonds (BN-PAHs), their optoelectronic applications have been less exploited. Herein, we report the achievement of high-mobility organic semiconductors based on existing BN-PAHs through a "periphery engineering" strategy. Tetraphenyl-and diphenyl-substituted BN-anthracenes (TPBNA and DPBNA, respectively) are designed and synthesized. DPBNA exhibits the highest hole mobility of 1.3 cm 2 V À 1 s À 1 in organic field-effect transistors, significantly outperforming TPBNA and all the reported BN-PAHs. Remarkably, this is the first BN-PAH with mobility over 1 cm 2 V À 1 s À 1 , which is a benchmark value for practical applications as compared with amorphous silicon. Furthermore, high-performance phototransistors based on DPBNA are also demonstrated, implying the high potential of BN-PAHs for optoelectronic applications when the "periphery engineering" strategy is implemented.

No abstract