Department of Chemistry, Jadavpur University, Kolkata 700 032, India.
Department of Physics, National Institute of Technology Durgapur, Durgapur 713209, India.
Dalton Trans. 2022 Sep 20;51(36):13749-13761. doi: 10.1039/d2dt01790c.
In the age of sustainable development, the exploration of multifunctional materials is of high priority due to their economic benefits and environmental suitability. A stable luminescent coordination polymer, [Zn(tdc)(pdiq)] (1), (pdiq = pyridyl-imidazoquinazoline; Htdc = 2,5-thiophenedicarboxylic acid) has been prepared and structurally confirmed by single-crystal X-ray diffraction analysis. The 3D framework consists of a distorted octahedral geometry with a ZnON coordination sphere where four carboxylato-O donations come from two tdc as bridging ligands and two pyridyl-Ns come from two pdiq. The π⋯π interactions between the imidazolium and phenyl groups bestow robustness on the architecture. The compound is chemically stable to water, shows tolerance to acid/base aqueous solutions (pH = 2-12), and is stable to the impact of organic solvents. The high dispersibility of Zn-MOF (1) in acetonitrile may enhance the fluorescence intensity compared to that in water, which prompted fluorescence measurements in the former solvent and it is used for the efficient and selective turn-off ratiometric sensing of Al ions (LOD, 1.39 × 10 M). In addition, the fluorescence emission of 1 is instantly quenched by trinitrophenol (TNP) and the LOD is 1.54 × 10 M. The Tauc's plot is used to measure the semiconducting band gap (3.33 eV) and the electrical conductivity is significantly increased upon illumination (: 1.14 × 10 S m (dark), 5.35 × 10 S m (light)) and the energy barrier declines marginally (FB: 0.57 (dark), 0.49 (light)). Transit time () and diffusion length () at the quasi-Fermi level were analyzed to offer information on the charge transport mechanism of the compound. The better performance on photo-irradiation signifies the enhanced charge transfer kinetics of a Zn-MOF coated thin-film device (TFD 1), which encourages its application in semiconductor devices.
在可持续发展的时代，由于多功能材料具有经济效益和环境适用性，因此对其进行探索具有很高的优先级。通过单晶 X 射线衍射分析，我们合成并结构确证了一种稳定的发光配位聚合物[Zn(tdc)(pdiq)]（1）（pdiq=吡啶-咪唑并喹唑啉；Htdc=2,5-噻吩二羧酸）。该 3D 骨架由扭曲的八面体几何形状组成，ZnON 配位球中四个羧基-O 供体来自两个 tdc 作为桥联配体，两个吡啶-Ns 来自两个 pdiq。咪唑鎓和苯基之间的π⋯π相互作用赋予了该结构的稳定性。该化合物对水化学稳定，能耐受酸碱水溶液（pH=2-12），对有机溶剂的影响稳定。Zn-MOF（1）在乙腈中的高分散性可能会提高其荧光强度，与在水中相比，这促使我们在前者溶剂中进行荧光测量，并将其用于高效和选择性的关闭比比率法 Al 离子（LOD，1.39×10 M）传感。此外，1 的荧光发射被三硝基苯酚（TNP）瞬间猝灭，LOD 为 1.54×10 M。Tauc 图用于测量半导体带隙（3.33 eV），并且在光照下电导率显著增加（：1.14×10 S m（黑暗），5.35×10 S m（光照）），能量势垒略有下降（FB：0.57（黑暗），0.49（光照））。在准费米能级下分析渡越时间（）和扩散长度（），以提供有关化合物电荷输运机制的信息。Zn-MOF 涂覆的薄膜器件（TFD 1）在光辐照下的更好性能表明了其电荷转移动力学的增强，这鼓励了其在半导体器件中的应用。
