Dimension-dependent fluorescence emission and photoelectric performances of a 3D pyrene-based metal−organic framework

A pyrene-based metal-organic framework [Ca2 (TBAPy) (μ2-OH2)2] (1, H4TBAPy ​= ​1,3,6,8-tetrakis (p-benzoic acid)pyrene), directed by ionic liquids, has been synthesized. 1 has non-interpenetrated open 3D framework constructed by infinite rod-shaped Ca-carboxylate secondary building units (SBUs) and rectangle TBAPy ligands. The temperature-dependent fluorescence emission clearly shows that 1 can maintain the excimer fluorescence emission in a broad temperature range (20–450 ​K). Photoelectronic measurements reveal that the average light photocurrent density (Ilight) of 1 is apparently higher than that of other 2D TBAPy-based MOFs. The dimension-dependent fluorescence emission and photoelectric performances of several TBAPy-based MOFs were well investigated based on the steric configuration and the interplanar distance of the coupled TBAPy ligands, as well as the photocurrent conduction path.