两例相同混合配体构筑的Pb(Ⅱ)/Ag(I)配位聚合物及其荧光性质

摘要/Abstract

摘要： 多齿配体2-咪唑乙酸(Hima)、4,4'-连吡啶分别与金属盐Pb(NO₃)₂和AgNO₃反应,得到[Pb₂(4,4'-bipy)(ima)(NO₃)₃]_n(1, 3D framework)和[Ag₄(4, 4'-bipy)₃(ima)₂(NO₃)₂(H₂O)₂]_n(2, 3D framework)两个配位聚合物。根据配位聚合物的结构特点,研究了这两个配位聚合物荧光性质等物理化学性能。配位聚合物1在最大激发波长(λ_ex=346 nm)激发下,荧光的最大发射波长为552 nm,配位聚合物2在最大激发波长(λ_ex=369 nm)激发下,荧光的最大发射波长为444 nm。这可能是由于金属和配体之间发生了电荷转移(LMCT)。

关键词: 配位聚合物, 光稳定, 荧光性质, 3D框架, 配体金属电荷转移

Abstract: The 2-(1H-imidazol-1-yl) acetic acid (Hima), 4,4'-bpy, reacts with metal ions Pb(NO₃)₂ and AgNO₃ respectively. Finally, [Pb₂(4,4'-bipy)(ima)(NO₃)₃]_n (1, 3D framework) and [Ag₄(4, 4'-bipy)₃(ima)₂(NO₃)₂(H₂O)₂]_n (2, 3D framework) coordination polymers were obtained. Based on the structural characterizations of the corresponding compounds, their chemical and physical properties, such as photoluminescence was investigated. The solid-state photoluminescence spectra of 1 and 2 at room temperature are observed to have their main emission at 552 nm and 444 nm (λ_ex=346 nm for 1, 369 nm for 2), respectively, which is mainly assigned to the ligand-metal charge transfer (LMCT).

Key words: coordination compound, photo-stability, fluorescence property, 3D framework, ligand-metal charge transfer

中图分类号:

O641.4

刘朋, 陈洪霞. 两例相同混合配体构筑的Pb(Ⅱ)/Ag(I)配位聚合物及其荧光性质[J]. 人工晶体学报, 2021, 50(8): 1444-1451.

LIU Peng, CHEN Hongxia. Two Pb(Ⅱ)/Ag(I) Coordination Polymers Constructed by the Same Mixed Ligand and Their Fluorescence Properties[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(8): 1444-1451.

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