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Herein, lead-free layered iodide double perovskites (C6H16N2)2MBiI8 (M = Ag/Cu) were synthesized, which showed typical semiconducting properties and obvious photocurrent response.

Structural dimensions, energy band gaps and thin film orientations are revealed to be amine-dependent in seven newly prepared cuprous–bismuth iodide double perovskites.

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Herein a strategy is reported for capturing and sensing iodine by strong I ⋅⋅⋅I ⋅⋅⋅I interaction, confined in a metal-organic framework, [Tb(Cu I )(ina) (DMF)] (1) (ina=isonicotinate). As revealed by single-crystal X-ray crystallography, the uptaken I molecules directly contact the {Cu I } chains, virtually forming an electronically polarizable tetraiodide anion (I ) through strong I ⋅⋅⋅I ⋅⋅⋅I interaction. As such, a quasi-copper-iodide layer of {Cu I } with semiconducting characteristics results, leading to a significant enhancement (Δ =10 times) in electrical conductivity over the I -free 1. The effect observed is several orders of magnitude higher than those reported due to iodine⋅⋅⋅aromatic interactions (Δ =10 times) and by interactions between I and a redox-active metal centre (Δ =10 times). The drastic enhancement in electrical conductivity was used to switch on/off an LED bulb, suggesting the possibility of electrically sensing I .

An efficient, wide-scope synthesis of thiol-equipped MOF solids offers ever stronger binding for mercury pollutants and broader horizons for functionalization of porous materials.

Covalent triazine frameworks (CTFs) are promising electrodes for rechargeable batteries due to their adjustable structures, rich redox sites, and tunable porosity. However, the CTFs usually exhibit inferior electrochemical stability because of the inactivation of the unstable radical intermediates. Here, a methylene-linked CTF has been synthesized and evaluated as a cathode for rechargeable lithium-ion batteries. Electron paramagnetic resonance (EPR) and in situ Raman characterizations demonstrated that the redox activity and reversibility of α-C and triazine radical intermediates are essentially important for the charging/discharging process, which have been efficiently stabilized by the synergetic π conjugation and hindrance effect caused by the adjacent rigid triazine rings and benzene rings in the unique CTF-p framework. Additionally, the methylene groups provided extra redox-active sites. As a result, high capacity and cycling stability were achieved. This work inspires the rational modulation of the radical intermediates to enhance the electrochemical performance of organic electrode materials for the next-generation energy storage devices.

Covalent organic frameworks are promising electrode materials for energy storage due to their uniform active sites, abundant pores, and high stability. However, the reported COF electrodes often display low discharge...