Premium
A fourfold interpenetrating cadmium(II) metal–organic framework based on 2,4,6‐tris(pyridin‐4‐yl)‐1,3,5‐triazine with reversible photochromic properties
Author(s) -
Liu Jian-Jun,
Li Li-Zhi,
Chen Chun-Ping,
Wei Jin-Zhong,
Cheng Fei-Xiang
Publication year - 2019
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229619002663
Subject(s) - photochromism , chemistry , triazine , ligand (biochemistry) , thermogravimetric analysis , metal organic framework , molecule , photochemistry , polymer chemistry , organic chemistry , biochemistry , receptor , adsorption
2,4,6‐Tris(pyridin‐4‐yl)‐1,3,5‐triazine (tpt), as an organic molecule with an electron‐deficient nature, has attracted considerable interest because of its photoinduced electron transfer from neutral organic molecules to form stable anionic radicals. This makes it an excellent candidate as an organic linker in the construction of photochromic complexes. Such a photochromic three‐dimensional (3D) metal–organic framework (MOF) has been prepared using this ligand. Crystallization of tpt with Cd(NO 3 ) 2 ·4H 2 O in an N , N ‐dimethylacetamide–methanol mixed‐solvent system under solvothermal conditions afforded the 3D MOF poly[[bis(nitrato‐κ 2 O , O ′)cadmium(II)]‐μ 3 ‐2,4,6‐tris(pyridin‐4‐yl)‐1,3,5‐triazine‐κ 3 N 2 : N 4 : N 6 ], [Cd(NO 3 ) 2 (C 18 H 12 N 6 )] n , which was characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis and single‐crystal X‐ray diffraction. The X‐ray diffraction crystal structure analysis reveals that the asymmetric unit contains one independent Cd II cation, one tpt ligand and two coordinated NO 3 − anions. The Cd II cations are connected by tpt ligands to generate a 3D framework. The single framework leaves voids that are filled by mutual interpenetration of three independent equivalent frameworks in a fourfold interpenetrating architecture. The compound shows a good thermal stability and exhibits a reversible photochromic behaviour, which may originate from the photoinduced electron‐transfer generation of radicals in the tpt ligand.