Abstract
A new blue photoluminescent 2D metal–organic framework, 1, with formula {[Zn2(μ2-BDC)2(iQ)2]}∞ has been synthesized in a high yield under solvothermal conditions by reacting Zn(II) ions with 1,4-benzenedicarboxylic acid (H2BDC) and isoquinoline (iQ) in DMF. Compound 1 was thoroughly characterized by single-crystal X-ray diffraction, solid-state cross-polarization magic-angle spinning 13C NMR, X-ray powder diffraction, scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS), and thermoanalysis. The crystal structure of 1 showed interpenetrated 2D frameworks consisting of dinuclear paddle-wheel cores Zn2; moreover, this material possessed thermostability up to 310 °C. The CPMAS 13C-NMR spectrum of 1 is consistent with the symmetry of the crystal structure. Luminescence studies showed that 1 strongly enhances its fluorescence emission in the presence of xylene isomers with a pronounced selectivity to p-xylene.
Highlights
In the area of optical sensing, metal–organic materials (MOMs) with polynuclear d10 metal cores containing coordinated fluorescent ligands are very attractive because they exhibit striking crystal structures and outstanding photoluminescence properties mainly caused by charge transfer mechanisms [1,2,17,18,26]
X-ray crystal structures, thermogravimetry, CPMAS 13 C-NMR spectroscopy, morphological studies with scanning electron microscopy (SEM)-energy dispersive X-ray spectroscopy (EDS), and fluorescent sensing properties obtained for a novel blue luminescent 2D MOF based on Zn-terephthalate with an isoquinoline core are discussed
This fluorescent enhancement may be related to the different interactions between compound 1 and xylene isomers, which have different shapes and volumes; p-xylene is linear and can present π–π interactions with the isoquinoline fragments groups
Summary
There is a growing interest in the development of photoluminescent metal–organic materials (MOMs) [1,2,3,4], where the color emission upon excitation is a significant feature of these materials that has been recently used in several applications such as emitting devices/materials [5,6], optical sensing of vapor phase analytes [3,7], detection of ions [8,9], bioanalytes [10], explosives [11,12], and detection of volatile organic solvents (VOCs) [8,13,14]. Methyl-substituted aromatic VOCs such as the xylene isomers and toluene are usually used as organic solvents in the industrial production of adhesives, rubber products, dyes, and paints [27]. The usage of luminescent MOMs to sense VOCs is promising due to their high stability and ease of preparation, in addition to advantages inherent of the fluorescence technique such as high sensitivity [3,32,36] Taking this into account, this work is based on the idea that a new metal–organic compound with photoluminescence can be achieved in a single step and in high yield by the straightforward combination of Zn(II) ions with 1,4-benzenedicarboxylic acid and a commercial benzopyridine ligand, which can act as a luminescent unit when coordinated to the metal center. X-ray crystal structures, thermogravimetry, CPMAS 13 C-NMR spectroscopy, morphological studies with SEM-EDS, and fluorescent sensing properties obtained for a novel blue luminescent 2D MOF based on Zn-terephthalate with an isoquinoline core are discussed
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