Two photoluminescent metal–organic frameworks with highly-connected topological nets

Abstract

Presented here are two three-dimensional metal–organic frameworks [H₂N(CH₃)₂]₂[Cd₅(bdt)₃(btc)₂(H₂O)₂]·3(H₂O) (1) (H₂bdt = 1,4-benzeneditetrazol-5-yl; H₃btc = 1,3,5-benzenetricarboxylic acid) and [Cd₅(Hbdt)₂(bdt)(btc)₂(H₂O)₂]·4H₂O (2) with integrated topological nets, where the trinuclear cadmium units act as 10-connected nodes. Since both compounds are built from a dual-ligand assembly approach, the topological analyses on the networks of compounds 1 and 2 are also considered as the integration of two nets. For compound 1, its net is integrating an xbe net of Cd–bdt connectivity and kgd net of Cd–btc connectivity, while the net of compound 2 is integrating a fry net of Cd–bdt connectivity and kgd net of Cd–btc connectivity. Furthermore, the luminescence properties of the two compounds are investigated in the solid state at room temperature.