Syntheses, structure and characterization of a fourfold interpenetrated 3D Cd(II) organic framework constructed with a zwitterionic ligand

Abstract

A 3-D cadmium(II) organic framework with a fourfold interpenetrated diamond topological structure, {[CdLBDC]·(H₂O)₂}_n (1), was synthesized through zwitterionic ligand H₃LBr₃ (1,1′,1″-(2,4,6-trimethylbenzene-1,3,5-triyl)-tris(methylene)tris(4-carboxypyridinium)tribromide), secondary ligand H₂BDC (1,4-benzenedicarboxylic acid) and Cd(NO₃)₂·4H₂O by solvothermal method. Compound 1 was characterized by elemental analyses, FT-IR spectroscopy, powder, and single-crystal X-ray diffraction and thermogravimetric analysis. The photophysical properties of 1 were investigated by solid-state diffuse reflectance spectrum. In 1, each L is linked by two separate Cd(II)-centered distorted tetrahedra, which are also linked by two L, thereby forming a head-to-tail connected 2-D layer structure and further building the 3-D framework through BDC²⁻-chelating-bridging between layers.

Keywords:

• Fourfold interpenetrated diamond topology
• cadmium(II) organic framework
• zwitterionic ligands

Disclosure statement

No potential conflict of interest was reported by the authors.

Funding

This work was supported by the National Natural Science Foundation of China [grant number 21201005], [grant number 21275006], [grant number 21271004], [grant number 51372003]; National Science Foundation of Anhui Province [grant number 1208085MB22], [grant number 1308085MB24], [grant number 1308085QB33]; China Postdoctoral Science Foundation funded project [grant number 2013M541810]; Doctor Foundation of Anhui Jianzhu University (2011).