With pyridinium zwitterionic ligand H 2 LCl 2 (1,1'- ((2,3,5,6-tetramethyl-1,4-phenylene)bis(methylene))bis(4carboxypyridin-1-ium)chloride) as the main connection point, a novel Cd ( ) coordination polymer namely) and a partially deprotonated HLClO 4 •H 2 O were obtained by room temperature volatilization method. X-ray diffraction studies reveal that HLClO 4 •H 2 O crystallizes in the monoclinic P2 1 /n space group, with a bowl shape partially deprotonated HL + cation as the main structure, and the ClO 4 anion which balances the charge just exists outside. When the ligand reacts with CdSO 4 8/3H 2 O, CP 1 crystallized in the triclinic P-1 space group with two distinct Cd ( ) centers was obtained. Abundant hydrogen bonds produce the 3D supramolecular structure of CP 1. Elemental analysis, powder X-ray diffraction, infrared spectrum, thermogravimetric analysis, solid-state uorescence properties and CIE analysis of CP 1 were studied. Results indicate that the CP 1 has good thermal stability and has potential applications in blue luminescent materials.
Dimetridazole (DTZ) is such a significant indicator in food safety assessment that a high priority should be given to it. In this work, a novel three-dimensional Metal-Organic Framework zwitterionic composite, {[CdL2]·Cl2·6H2O} (MOF 1), was synthesized by hydrothermal method and applied as a fluorescence probe for the detection of DTZ. Several crucial factors of the obtained MOF 1, such as structure stability, fluorescence properties, selectivity, sensitivity and reproducibility, were studied in detail. A series of sensing investigations demonstrate extremely specific and ultrafast detection of DTZ via a conspicuous fluorescence quenching (Ksv=8.1374 × 104 M− 1) from MOF 1 under the optimized conditions. The linear range for quantitative detection of DTZ was 0.0 µM ~ 40.0 µM with a low limit of detection of 0.012 µM. The fluorescence quenching mechanisms have been explained, being caused by a combination of both competitive absorption and photoinduced electron transfer. DTZ in milk, honey, tap and lake water were successfully determined by this fluorescence probe with quick response, and the recovery rates are 97.4%∼102.6%, which indicates MOF 1 having a tremendous application prospect in the detection of DTZ in food and environmental samples.
With pyridinium zwitterionic ligand H2LCl2 (1,1'-((2,3,5,6-tetramethyl-1,4-phenylene)bis(methylene))bis(4-carboxypyridin-1-ium)chloride) as the main connection point, a novel Cd (Ⅱ) coordination polymer namely [Cd(L)2(SO4)2(H2O)2][Cd(H2O)6]·4H2O (CP 1) and a partially deprotonated HLClO4·H2O were obtained by room temperature volatilization method. X-ray diffraction studies reveal that HLClO4·H2O crystallizes in the monoclinic P21/n space group, with a bowl shape partially deprotonated HL+ cation as the main structure, and the ClO4-anion which balances the charge just exists outside. When the ligand reacts with CdSO4‧8/3H2O, CP 1 crystallized in the triclinic P-1 space group with two distinct Cd (Ⅱ) centers was obtained. Abundant hydrogen bonds produce the 3D supramolecular structure of CP 1. Elemental analysis, powder X-ray diffraction, infrared spectrum, thermogravimetric analysis, solid-state fluorescence properties and CIE analysis of CP 1 were studied. Results indicate that the CP 1 has good thermal stability and has potential applications in blue luminescent materials.
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