Zeolitic imidazolate framework-8(ZIF-8),a metal-organic framework(MOF)with a non-centrosymmetric crystal structure,exhibits nonlinear optics(NLO)properties and can act as the nanoporous matrix of guest molecules.Amorp...Zeolitic imidazolate framework-8(ZIF-8),a metal-organic framework(MOF)with a non-centrosymmetric crystal structure,exhibits nonlinear optics(NLO)properties and can act as the nanoporous matrix of guest molecules.Amorphization of ZIF-8 can be achieved by pressure or high temperature.Both crystalline and amorphous states have their inherent features for optical applications.The effects of the crystalline-amorphous transition on the structural and optical properties under pressure were investigated in detail.Amorphization leads to the destruction of the ZIF-8 lattice structure,collapse of pores,and the change of spatial symmetry,which in turn alters the NLO properties of ZIF-8 and the luminescence properties of the guest Eu cations.Our results establish the structure–optical properties relationship in the amorphization process and provide new clues in designing novel MOFs optical materials.展开更多
基金financially supported by the National Key Research&Development Program of China(No.2017YFB0310503)National Natural Science Foundation of China(Nos.U1830125,11535010,and 52002384)the support of Pujiang Talent Plan(No.2020PJD079)。
文摘Zeolitic imidazolate framework-8(ZIF-8),a metal-organic framework(MOF)with a non-centrosymmetric crystal structure,exhibits nonlinear optics(NLO)properties and can act as the nanoporous matrix of guest molecules.Amorphization of ZIF-8 can be achieved by pressure or high temperature.Both crystalline and amorphous states have their inherent features for optical applications.The effects of the crystalline-amorphous transition on the structural and optical properties under pressure were investigated in detail.Amorphization leads to the destruction of the ZIF-8 lattice structure,collapse of pores,and the change of spatial symmetry,which in turn alters the NLO properties of ZIF-8 and the luminescence properties of the guest Eu cations.Our results establish the structure–optical properties relationship in the amorphization process and provide new clues in designing novel MOFs optical materials.
