AIE-active tetraphenylethene functionalized metal–organic framework for selective detection of nitroaromatic explosives and organic photocatalysis
作者:Qiu-Yan Li、Zheng Ma、Wen-Qiang Zhang、Jia-Long Xu、Wei Wei、Han Lu、Xinsheng Zhao、Xiao-Jun Wang
DOI:10.1039/c6cc04997d
日期:——
A luminescent MOF containing an AIE-active TPE moiety works as a selective sensor for detecting nitroaromatic explosives, as well as an efficient heterogeneous photocatalyst for CDC reactions mediated by visible light.
An elegant cascade cross‐coupling and in situ hydrogenation reaction has been established by visiblelightcatalysis. Combining cheap and earth‐abundant eosin Y as a photosensitizer and the cobalt chloride complex, Co(dmgH)2Cl2 (dmgH=dimethylglyoximate), as a catalyst, the desired oxidative cross‐coupling products and reductive hydrogenation products could be achieved in good to excellent yields without
paramagnetic resonance) experiment provides direct evidence on the generation of superoxide radical anion (O2−.) rather than singlet oxygen (1O2) under irradiation of the reaction system, in contrast to that reported in the literature. Combined, the photoinduced electron‐transfer and subsequent formation of superoxide radical anion (O2−.) results in a clean and facile transformation.
By using catalytic amount of CoCl2 with dmgH (dimethylglyoxime) as ligand to form a photosensitizer in situ, a highly selective, efficient, and environmentally benign visible light mediated cross-dehydrogenative coupling (CDC) reaction has been developed in aqueous medium. The desired cross-coupling C-C bonds that involve C-sp3 with C-sp, C-sp2, and C-sp3, respectively, were achieved exclusively in high yields without formation of any other byproduct.
Cross-Coupling Hydrogen Evolution Reaction in Homogeneous Solution without Noble Metals
A highly efficient noble-metal-free homogeneous system for a cross-coupling hydrogen evolution (CCHE) reaction is developed. With cheap, earth-abundant eosin Y and molecular catalyst Co(dmgH)(2)Cl-2, good to excellent yields for coupling reactions with a variety of isoquinolines and indole substrates and H-2 have been achieved without any sacrificial oxidants. Mechanistic insights provide rich information on the effective, dean, and economic CCHE reaction.