Novel Photo-induced Coupling Reactions of 9-Fluorenylidenemalononitrile or 1,1-Diphenyl-2,2-dicyanoethylene with 10-Methyl-9,10-dihydroacridine. A Study on the Photophysics of the Reaction

9-Fluorenylidenemalononitrile (FDCN) or 1,1 diphenyl 2,2 dicyanoethylene (DPCN) reacted with 10 methyl 9,10 dihydroacridine (AcrH 2) under irradiation ( λ >320 nm) to give couping products. In order to gain further insight into the mechanism of the photo induced reaction, the photophysics of the reactions of FDCN or DPCN with AcrH 2 have been investigated by using UV vis spectroscopy, fluorescence spectroscopy, excitation spectroscopy and time resolved fluorescence spectroscopy, respectively. The results show that FDCN or DPCN interacts with AcrH 2 in the ground states to form a charge transfer complex, which further reacts to give the coupling product upon irradiation.

2Dπ‐conjugated metal-organic frameworks for CO_(2) electroreduction

Electrochemically converting CO_(2) molecules into valuable chemicals and fuels opens up a promising route to utilize CO_(2) source.To overcome the low efficiency and durability that hinder its practical applications,tremendous research efforts have been devoted to nano‐level or atomic‐level catalyst design.The advent of metal-organic frameworks(MOFs)provides novel opportunities for CO_(2) reduction catalysts,which may integrate the respective advantages of traditional catalysts and single‐atom catalysts.In this review,we summarize the recent advances in two‐dimensional(2D)π‐conjugated MOF catalysts and discuss their practical applications in CO_(2) reduction reaction(CO_(2)RR).First,we systematically introduce the development of electrocatalysts for CO_(2)RR applications.Meanwhile,various types of 2D porphyrin/phthalocyanine‐based MOFs and corresponding electrocatalytic performances arising from activesite engineering,surface reconstruction,and thickness control are briefly overviewed.Finally,we highlight their major challenges and opportunities facing CO_(2)RR,and hope that this review can offer new insight into MOF catalyst design.