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Two Comparable Isostructural Microporous Metal–Organic Frameworks: Better Luminescent Sensor and Higher Adsorption Selectivity for the Fluorine‐Decorated Framework
Author(s) -
Wang HaiHua,
Guo TaoTao,
Xie Dong,
Bai ZhiQin,
Hou Lei,
Wang YaoYu
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201500981
Subject(s) - chemistry , isostructural , dabco , metal organic framework , bifunctional , luminescence , inorganic chemistry , microporous material , acetonitrile , carboxylate , adsorption , photochemistry , crystallography , octane , organic chemistry , crystal structure , physics , optoelectronics , catalysis
Two isostructural 3D metal–organic frameworks (MOFs), {[Zn 3 (tzba) 3 (dabco)] · 5DMF · 3H 2 O} ( 1 ) and {[Zn 3 (F‐tzba) 3 (dabco)] · 5DMA · 3H 2 O} ( 2 ) [tzba = 4‐(1 H ‐tetrazol‐5‐yl) benzolate, F‐tzba = 2‐fluoro‐4‐(1 H ‐tetrazol‐5‐yl) benzolate, dabco = triethylenediamine], were solvothermally synthesized from a tetrazolate–carboxylate bifunctional linker and a diamine ligand. The framework contains an uncommon metal–tetrazolate–carboxylate linear trinuclear Zn 3 (ttaz) 3 (COO) 3 (ttaz = tetrazolyl) cluster, which serves as an eight‐connected node to afford a 3D porous network. Both 1 and 2 show strong photoluminescence and selective luminescent quenching for Cu 2+ ions and nitrobenzene relative to that shown by other metal ions (e.g., Na + , K + , Mg 2+ , Ca 2+ , Mn 2+ , Co 2+ , Ni 2+ , Cd 2+ , and Pb 2+ ) and organic solvents (e.g., methanol, ethanol, acetonitrile, n ‐propanol, 2‐propanol, ethyl acetate, toluene, dichloromethane, N , N′ ‐dimethylformamide, and N ‐methylpyrrolidone). It is interesting to find that relative to 1 , 2 decorated with F atoms exhibits more efficient luminescent sensing for these two guests. Furthermore, 2 also adsorbs more CO 2 and has higher CO 2 /CH 4 adsorption selectivities than 1 under the same conditions, which can be ascribed to the CO 2 ‐philic F sites in the pores of 2 . These advantages make 2 a promising material in both luminescent sensors and CO 2 separation from a CO 2 /CH 4 mixture.