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5‐(3′,4′‐Dicarboxylphenoxy)isophthalate/5‐(2′,3′‐Dicarboxylphenoxy)isophthalate‐Based 3D Cadmium(II) Coordination Polymers: Synthesis, Structure, and Sensing of Nitrobenzene
Author(s) -
Wang YanNing,
Yu JieHui,
Xu JiQing
Publication year - 2015
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201500308
Subject(s) - isophthalic acid , sbus , nitrobenzene , crystallography , molecule , propane , oligomer , chemistry , carboxylate , topology (electrical circuits) , stereochemistry , materials science , polymer chemistry , metal organic framework , terephthalic acid , polyester , organic chemistry , catalysis , mathematics , adsorption , combinatorics
5‐(3′,4′‐Dicarboxylphenoxy)isophthalic acid (H 4 L1) and 5‐(2′,3′‐dicarboxylphenoxy)isophthalic acid (H 4 L2) were reacted with Cd 2+ salt with/without the assistance of N‐donor ligands, creating five 3D Cd II coordination polymers [Cd 2 (L1)(H 2 O) 5 ] ⋅ H 2 O ( 1 ), [Cd 2 (L1)(bpe)(H 2 O)] (bpe=1,2‐bis(4‐pyridyl)ethene; 2 ), [Cd 2 (L1)(bpa)(H 2 O)] (bpa=1,2‐bis(4‐pyridyl)ethane; 3 ), [Cd 2 (L1)(bpp)] (bpp=1,3‐bis(4‐pyridyl)propane; 4 ), and [Cd 2 (L2)(bpp) 2 (H 2 O) 2 ] ⋅ H 2 O ( 5 ). Crystal‐structure analysis reveals 1) in 1 , phthalate moieties for L1 link Cd1 centers into a 1D slightly helical chain; Cd2 centers act as bridges, linking 1D helical chains into a 3D network with a (3,5)‐connected topology; 2) in 2 – 4 , although Cd 2+ centers were further modified by the introduction of organic bases, L1 molecules still link Cd 2+ centers into 3D networks, which can all be simplified as pcu topology; 3) in 2 – 4 , phthalate moieties first link Cd 2+ centers into an oligomer, in which carboxylate‐bridged discrete or rod‐shaped secondary building units (SBUs) are found (tetranuclear SBU in 2 and 3 , rod‐shaped SBU in 4 ); and 4) in 5 , L2 molecules link Cd 2+ centers into a 2D (4,4) net; introduced bpp molecules serve as pillar linkers, extending Cd 2+ –L2 layers into a 3D network of 5 . The sensing abilities of 2 – 5 for nitrobenzene (NB) were investigated. Results revealed that they could all serve as fluorescence probes to sense NB at ppm concentrations.