首页|Photoluminescent nickel(Ⅱ)carbene complexes with ligand-to-ligand charge-transfer excited states
Photoluminescent nickel(Ⅱ)carbene complexes with ligand-to-ligand charge-transfer excited states
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While nickel(Ⅱ)complexes have been widely used as catalysts for carbon-carbon coupling reactions,the exploration of their photophysical and photochemical properties is still in the infancy.Here,a series of square-planar Ni(Ⅱ)complexes[(diNHC)NiX2]bearing chelating benzimidazole-based bis(N-heterocyclic carbene)ligands and varying anionic coligands(1,X=Cl;2,X=Br;3,X=I)are synthesized and struc-turally characterized.In solid state,both 1 and 2 exhibit orange-red photoluminescence under ambient conditions.The photophysical and electrochemical measurements along with density functional theory(DFT)calculations reveal that the low-energy emissions can be attributed to singlet excited states with ligand-to-ligand charge-transfer(LLCT)character.This work suggests that strong-field N-heterocyclic car-bene ligands play a crucial role to achieve the luminescence of Ni(Ⅱ)complexes.
Nickel(Ⅱ)complexesN-Heterocyclic carbeneLuminescenceLigand-to-ligand charge-transfer characterLow-lying d-d excited states
Key Laboratory of Photochemical Conversion and Optoelectronic Materials & CAS-HKU Joint Laboratory on New Materials,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China
University of Chinese Academy of Sciences,Beijing 100049,China
Department of Chemistry,Southern University of Science and Technology,Shenzhen 518055,China
国家自然科学基金CAS-Croucher Funding Scheme for Joint Laboratories北京市科委项目
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