Canadian Journal of Chemistry
·
2020
·Vol. 98
·期 10
·
IF 1.171
Cheng Cao,Xingmei You,Lei Feng,Guanghong Luo,Guoren Yue,Xiangdong Ji
Two new chromogenic sensors 1-(2-hydroxyphenyl)-3-(4-nitrophenyl)thiourea 1 and 1-(3-hydroxypyridin-2-yl)-3-(4-nitrophenyl)thiourea 2 bearing nitrophenyl and thiourea groups were designed and synthesized by one-step procedure and characterized through 1H NMR, 13C NMR, FTIR, and MS. The anion recognition property of the receptors was studied via naked-eye detection, UV–vis, and 1H NMR. Based on the existence of amino gen and hydroxyl moieties in receptors, receptors 1 and 2 exhibit obvious selectivity by the redshift of UV–vis signals, colour changes through naked-eye detection, and binding effects for F–, H2PO4–, and Ac–. Surprisingly, the detection limits of receptor 1 for F– and Ac– were calculated to be 5.45 × 10−7 and 2.11 × 10−7 (mol/L)−1, respectively, which indicated that F– and Ac– can be identified with high sensitivity by receptor 1. Besides, simple “test strips” were developed and were used as sensors for recognition of F–, H2PO4–, or Ac– in DMSO solution. Lastly, the mechanisms of the recognition process were studied through DFT calculation and 1H NMR titration.
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Journal of the American Chemical Society
·
2021
·
IF 15.419
Jing Lu,Xin Liu,Min Zhao,Xue-Bin Deng,Ke-Xin Shi,Qian-Ru Wu,Ling Chen,Li-Ming Wu
We herein report a novel semiorganic NLO material, (C5H6ON)+(H2PO4)−, 4HPP, showing promising excellent properties in the important solar-blind UV region where LAP and its deuterated form DLAP are the only commercialized semiorganic materials. For the first time, the 4-hydroxypyridine (4HP+, (C5H6ON)+) cation is identified as NLO active and how to eliminate the dipole–dipole interaction to avoid the unwanted center-symmetry-trap caused by the polar-induced susceptibility is well demonstrated. Remarkably, 4HPP exhibits competitive and even better properties compared with LAP that include better thermal stability (decomposition at 166 vs 112 °C of LAP); wider transparency range (0.26–1.50 μm); very strong SHG response (3 × KDP); a suitable large birefringence (Δncal = 0.25 vs 0.075 of LAP); and a high laser-induced damage threshold (2.2 × KDP). First-principles calculations show that the π-conjugated organic (4HP)+ cation governs the optical anisotropy, whereas the synergy of the organic and inorganic moieties dominates the SHG process. Our discovery points out a new path for the rational design of high performance semiorganic materials that require an acentric structure.
研究领域:
材料科学
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非线性光学
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无机化学
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理论化学
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光子学
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高影响因子
TETRAHEDRON
·
2013
·Vol. 70
·期 4
·1011-1015
·
IF 2.803
Mengyu Zhang,Wei Lu,Jinting Zhou,Ganhong Du,Liming Jiang,Jun Ling,Zhiquan Shen
The chiral Schiff base N -(2-hydroxy-1-naphthyl)methylidene-( S )-α-phenylethylamine ( 1 ) was designed and synthesized as a fluorescent chemosensor based on the photoinduced electron transfer (PET) and C N isomerization mechanisms. The receptor exhibited a highly selective switch-on fluorescence response toward Zn 2+ and especially avoided the interference of Cd 2+ when the detection was conducted in unbuffered methanol solution. Furthermore, the in situ generated 1 ·Zn II -complex could be employed for the specific recognition of H 2 PO 4 − by fluorescence turn-off signaling through a ligand displacement process.
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高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 46
·6424-6433
·
IF 3.1
Ya-Ping Li,Jian-Hua Zhang,Xiao-Xia Zhang,Sui-Jun Liu
A new Zn(II) metal–organic framework (MOF) with the formula [Zn(BBIP)(2,6-NDC)]n (JXUST-44, BBIP = 3,5-bis(1H-benzo[d]imidazol-1-yl)pyridine and 2,6-H2NDC = 2,6-naphthalic acid) was synthesized under solvothermal conditions. The adjacent Zn(II) ions are connected by BBIP ligands to form one-dimensional (1D) chains, which are further linked by carboxylate groups of 2,6-NDC2− ligands to obtain a two-dimensional layer structure, resulting in a 2D → 3D polycatenated MOF. JXUST-44 can be simplified as a 4-connected sql topology and shows good chemical stability in a wide pH range from 2 to 12 at room temperature. The fluorescence experiments indicate that JXUST-44 presents sensitive and selective detection of salicylaldehyde (SA), acetylacetone (acac) and H2PO4− with the detection limits of 0.074, 10.311 and 0.011 ppm, respectively. It is worth noting that JXUST-44 shows turn-on fluorescence toward acac and H2PO4−, as well as good recyclability and stability for acac, SA and H2PO4−. Therefore, JXUST-44 can be considered as a good fluorescent sensor for acac, SA and H2PO4−. The sensing mechanism has also been studied in detail.
研究领域:
材料科学
·
化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL SCIENCES
·
2020
·Vol. 132
·期 1
·1-14
·
IF 1.406
Cheng Si Yuan,Yang Xi Nan,Tao Zhu,Wei Lian Tong,Zhao Wei Wei,Jiang Dao Fa,Jin Yan Mei,Gao Jie,Ma Pei Hua
Abstract The host–guest binding characteristics of cyclopentanocucurbit[6]uril (CyP 6 Q[6]) and cyanine dye trans -4-[4-(dimethylamino)styryl]-1-methylpyridinium iodide ( t -DSMI) have been studied. The results show that CyP 6 Q[6] and t -DSMI form a 1:1 inclusion system, generating strong fluorescence. On this basis, the fluorescent probe t -DSMI@CyP 6 Q[6] has been constructed, and its anion recognition ability has been investigated. In a neutral environment, BF 4 − , H 2 PO 4 − , and I − elicit obvious specific responses from the probe, since they have stronger binding forces. This probe shows greater sensitivity than the previously reported probe t -DSMI@HMeQ[6]. Graphic abstract Since the complex formed by CyP 6 Q[6] and t -DSMI can produce strong fluorescence at pH > 4.6, t -DSMI@CyP 6 Q[6] was constructed to recognize the anions at pH ≅ 5. The results show that in a near neutral environment, BF 4 − , H 2 PO 4 − , and I − elicit obvious specific responses from the probe.
研究领域:
分析化学
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材料科学
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化学传感器
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Bo Zhang,Shiyu Ma,Xin Mi,Wenjia Xiao,Xinai Xiao,Jinjue Wang,Hui Zeng,Yuan Chang,Jungang Hou
The sluggish kinetics of both proton dissociation and proton migration during OER is identified as the key bottleneck. • High-pKa H 2 PO 4 − groups are incorporated into NiFe LDH to upshift the d-band center and optimize electronic structure. • H 2 PO 4 − groups function as proton ferry to facilitate O H bond cleavage and reduce the energy barrier. • A proton highway is constructed via the Grotthuss mechanism by mediating a hydrogen-bond-rich microenvironment. • Synergistic promotion of proton dissociation and migration leads to outstanding OER activity and stability. Alkaline water electrolysis represents a promising strategy for sustainable hydrogen production. However, its energy efficiency is significantly constrained by the inherently sluggish kinetics of proton dissociation and proton migration during oxygen evolution reaction (OER). To address this limitation, the H 2 PO 4 − groups with high pKa value were reasonably incorporated into the lattice of NiFe-layered double hydroxide (P-NiFe LDH), thus optimizing the electronic structure by upshifting the d -band centre to improve the mass transfer. Additionally, the H 2 PO 4 − groups also functioned as proton ferry groups, which facilitated the cleavage of O H bonds in key intermediates to reduce the energy barrier. The in-situ Raman spectra and DFT calculations further confirmed that the H 2 PO 4 − groups mediated the microenvironment rich in hydrogen bond network, thus constructing a highway for proton transport via the Grotthuss mechanism. Ultimately, the P-NiFe LDH demonstrated exceptional activity toward water oxidation, requiring only an overpotential of 283 mV at the current density of 100 mA cm −2 , while maintaining remarkable stability for over 50 h at 10 mA cm −2 . This work not only highlights the importance of synergistically promoting the process of proton dissociation and proton migration in OER, but also provides valuable insights for the design of high-performance OER electrocatalysts.
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高影响因子
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