ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
·
2023
·Vol. 238
·期 3
·541-543
·
IF 0.3
Chuanguo Cui,Jinxiao Zhang,Zhiyin Xiao
C 61 H 50 Cl 2 Fe 2 I 12 N 12 , orthorhombic, Pbcn (no. 60), a = 13.0247(4) Å, b = 17.0204(5) Å, c = 34.1475(9) Å, β = 90, V = 7570.0(4) Å 3 , Z = 4, R gt
( F ) = 0.0694, wR ref
( F
2 ) = 0.1605, T = 293(2) K.
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MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Xiya Wang,Zhaoguo Zhang,Zhengfeng Huang,Peimei Dong,Xiaoxiao Nie,Zhi Jin,Xiwen Zhang
The photoreduction of CO 2 by using Ho and N co-doped TiO 2 was explored. The doping elements can further improve the separation efficiency of photogenerated electron-hole pairs via refining grains, causing lattice distortion and adsorbing more hydroxyl radicals(·OH). We found that there exists product selectivity such that the photoreduction products of Ho/N-TiO 2 mainly consist of CO and methanol, while the counterparts of pristine TiO 2 are CO and methane. The possible mechanism of CO 2 reduction is depicted involving the generation and combination of specific radicals. Thus, the amount of ·OH adsorbed on the surface of the catalyst makes a significant difference in the selectivity in the reduction products. Ho/N-TiO 2 catalyst with the synergic effect of Ho and N showed the best photoreductive performance for CO 2 with H 2 O to CO and CH 4 , and its formation rate of CH 4 was 29 μmol/gcatal./hour.
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ChemCatChem
·
2018
·Vol. 10
·期 18
·4090-4099
·
IF 4.674
Hang Li,Botao Wu,Fumin Wang,Xubin Zhang
Graphical No DMPUing ground : Efforts are made to design mercury-free catalysts from both technical and economic aspects. Here, a Ru-based catalyst with a low Ru content is prepared by adding DMPU as an efficient stabilizer. The catalyst shows high activity and stability. A new Ru-based catalyst system based on N,N′-Dimethylpropyleneurea (DMPU) was developed for the acetylene hydrochlorination reaction in this study. The optimal 1 % Ru-10 %DMPU/AC catalyst exhibits the best activity with the acetylene conversion of 87.6 % under 170 °C and the GHSV (C 2 H 2 ) of 900 h −1 . Additionally, the Ru-10 %DMPU/AC with lower Ru content (0.2 wt%) displayed excellent activity and stability with acetylene conversion of 81.3 % after 200 h under the conditions of 170 °C and C 2 H 2 GHSV of 180 h −1 . The characterization results indicate that the presence of DMPU could improve the dispersion of the catalytic species and provide full protection to prevent the sintering of the ruthenium particles and to inhibit the reduction of active ruthenium oxide component. Moreover, the catalytic property, characterizations and theoretical calculation results reveal that the ability to adsorb and activate HCl reactant with the addition of DMPU via its strong hydrogen bonding plays a significant role on the high stability of the Ru-DMPU/AC catalyst system.
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JOURNAL OF FLUORESCENCE
·
2015
·Vol. 25
·期 5
·1183-1189
·
IF 1.927
Wu Fuyong,Xu Guangjun,Zeng Xi,Mu Lan,Redshaw Carl,Wei Gang
N , N ′-bis(4-methoxysalicylide)benzene-1,4-diamine ( S1 ) was synthesized from 4-methoxysalicylaldehyde and p -phenylenediamine and it was found to exhibit interesting aggregation-induced emission enhancement (AIEE) characteristics. In aprotic solvent, S1 displayed very weak fluorescence, whilst strong emission was observed when in protic solvent. The morphology characteristics and luminescent properties of S1 were determined from the fluorescence and UV absorption spectra, SEM, fluorescence microscope and grading analysis. Analysis of the single crystal diffraction data infers that the intramolecular hydrogen bonding constitutes to a coplanar structure and orderly packing in aggregated state, which in turn hinders intramolecular C-N single bond rotation. Given that the three benzene rings formed a large plane conjugated structure, the fluorescence emission was significantly enhanced. The absolute fluorescence quantum yield and fluorescence lifetime also showed that radiation transition was effectively enhanced in the aggregated state. Moreover, the AIEE behavior of S1 suggests there is a potential application in the fluorescence sensing of some volatile organic solvents.
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RSC Advances
·
2016
·Vol. 6
·期 30
·25302-25310
·
IF 3.289
Nafeesa Mushtaq,Guofei Chen,Lala Rukh Sidra,Xingzhong Fang
To investigate the asymmetric effect of the naphthalimide moiety on the thermal, mechanical, optical properties and water uptake of polyimides (PIs), two novel asymmetric diamines, 4-(4-aminophenoxy)-N-amino-1,8-naphthalimide 3 and 4-(4-aminophenoxy)-N-(4-aminophenyl)-1,8-naphthalimide 4 were synthesized. Two series of PIs 5b–e and 6a–e were prepared from diamines 3 and 4 by solution polymerization method, respectively. The resulting polyimides demonstrated good solubility, high glass transition temperature (Tg) of 311–421 °C and good thermal stability based on the 5% weight loss temperature (T5%) of 435–563 °C in nitrogen. These PIs also exhibited good mechanical properties with tensile strengths of 107.3–172.2 MPa, tensile moduli of 2.8–4.9 GPa, and elongations at break of 2.9–9.1%. The water uptake of PIs was in the range of 0.33–1.96%. The polyimides displayed UV-vis absorption maxima and an intense fluorescent intensity in the range of 361–371 and 480–700 nm, respectively.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Qingsong Li,Midong Shi,Liping Wang,Gaoyin He,Fan Gan
The liquid–liquid equilibrium (LLE) experiments for n-butanol + n-hexane + ethylene glycol were carried out and LLE data were measured at 298.15, 303.15, 308.15, 313.15, and 323.15 K under atmospheric pressure. The analysis results of the effects of n-butanol content and temperature on extraction showed that high n-butanol content was not favorable for extraction, and temperature had little effect on extraction. Moreover, the NRTL and UNIQUAC models were applied to correlate the LLE data, and the correlated data indicated that the UNIQUAC model showed a better correlation performance.
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DYES AND PIGMENTS
·
2012
·
IF 3.126
Weihua Dong,Hui Wen,Xiao-Feng Yang,Hua Li
A highly selective fluorescent probe for the effective discrimination of N-acetylcysteine (NAC) from cysteine (Cys) is proposed. Probe 1 contains an N,N-diethylrhodol ( DER ) dye and a dinitrophenyl ether moiety. Upon mixing with NAC in aqueous cetyltrimethylammonium bromide (CTAB) micellar solution , 1 was thiolyzed by NAC to release DER , thus affording a significant increase in fluorescence emission . Whereas for Cys, it gives only a dim response at the same reaction conditions. The significant difference in reaction rates can be explained via the fact that NAC shows more hydrophobicity than Cys, therefore the Meisenheimer complex intermediate ( 2a ) of its nucleophilic aromatic substitution with 1 can embed in CTAB micelles effectively, which will facilitate the formation of 2a and hence affords an acceleration of reaction rates. The proposed method shows an excellent selectivity for NAC over Cys, homocysteine (Hcy) and other amino acids.
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FLUID PHASE EQUILIBRIA
·
2014
·
IF 2.241
Chunlin Li,Qinbo Wang,Binwei Shen,Zhenhua Xiong,Chuxiong Chen
The solubility of 5,10,15,20-tetrakis(4-chlorophenyl) porphyrin manganese(III) chloride (abbreviated in p -ClTPPMnCl) in N , N -dimethylformamide (abbreviated in DMF) + water solvent mixtures at 293.2–353.2 K were measured. The effects of mass fraction of DMF in the solvent mixtures at 1.00–0.80 on the solubility were studied. The results show that the solubility decreases with the decreasing mass fraction of DMF at constant temperature, and increase with the increasing temperature at constant solvent composition. The experimental data were correlated with Apelblat equation, and the solubilities calculated by the model were in good agreement with experimental observations.
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INORGANIC CHEMISTRY
·
2015
·
IF 4.762
Fangfang Zhong,Ahmet Karatay,Liang Zhao,Jianzhang Zhao,Cheng He,Caishun Zhang,Halime Gul Yaglioglu,Ayhan Elmali,Betül Küçüköz,Mustafa Hayvali
Pt(II) dbbpy bisacetylide (dbbpy = 4,4′-di(tert-butyl)-2,2′-bipyridine) complex (Pt-1) with two different Bodipy ligands was prepared with the goal to attain broad-band visible light absorbing, efficient funneling of the photoexcitation energy (via resonance energy transfer, RET) to the energy acceptor and high triplet formation quantum yields. Construction of the above-mentioned molecular structural motif is challenging because two different arylacetylide ligands are incorporated in the complex; normally two homoleptic acetylide ligands were used for this kind of N∧N Pt(II) complexes. A reference complex with trans bis(tributylphosphine) Pt(II) bisacetylide protocol (Pt-4) was prepared for comparison of the photophysical properties. The two different Bodipy ligands in Pt-1 and Pt-4 constitute singlet/triplet energy donor/acceptor, as a result the harvested photoexcitation energy can be funneled to the triplet state confined on one of the two Bodipy ligands. The photophysical properties of the complexes were studied with steady state UV–vis absorption and luminescence spectroscopies, femto- and nanosecond transient absorption spectroscopies, cyclic voltammetry, as well as DFT/TDDFT calculations. Fluorescence/phosphorescence dual emission were observed for the complex. The ultrafast intramolecular singlet/triplet energy transfer in Pt-1 was confirmed by the transient absorption spectroscopy (kFRET = 2.6 × 1011 s–1, ΦFRET = 87.1%) followed by an intersystem crossing (kISC = 1.9 × 1010 s–1), and the triplet state lifetime (τT) is 54.1 μs. The reference complex Pt-4 shows drastically different kinetics with kFRET = 6.9 × 1010 s–1, ΦFRET = 81.0%, kISC = 5.83 × 109 s–1, and τT = 147.9 μs. Different singlet oxygen (1O2) quantum yields (ΦΔ = 75% and 70%) and triplet state quantum yields (ΦT = 91% and 69%, respectively) were observed for complexes Pt-1 and Pt-4.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Mei Ma,Jia-qi Bai,Huangfei Liu,Ben Liu,Zhangkai Qian,Suiqin Li,Jingshuai Chen,Mengdie Cai,Song Sun
The preparation of methyl-substituted amines by direct N-methylation of amines with CO2/H2 is an important reaction for CO2 utilization and organic synthesis. However, the design and construction of effective and stable non-noble-metal catalysts for this reaction remain challenging. Here, a cheap non-noble-Cu-based catalyst was prepared and applied in the direct N-methylation reaction of N-methylaniline with CO2 and H2. 5%Cu-ZnO(3.75%)/TiO2 showed 98.8% yield with an initial TOF of 7.7 h–1 after 24 h under 453 K, 1.5 MPa CO2, and 4.5 MPa H2, which was superior to 5%Cu/TiO2, 5%Cu/ZnO, and reported Cu-based catalysts. Furthermore, 5%Cu-ZnO(3.75%)/TiO2 can be reused at least four times and applied to the direct N-methylation of various amines with excellent selectivity. The various characterizations and experimental results showed that Cu0 was the active site, and 5%Cu-ZnO(3.75%)/TiO2 exhibited the largest surface Cu0 amount, thereby contributing to superior catalytic performance. The reaction mechanism of the direct N-methylation reaction of N-methylaniline with CO2 and H2 was proposed based on spectroscopic studies, kinetic studies, and control experiments. The reaction proceeded with the HCHO and N-methylformanilide intermediates, and the formation of HCHO from H2 and CO2 was the rate-determining step.
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ACS Nano
·
2024
·
IF 15.8
Jixi Zeng,Jing Wang,Jinzhao Wang,Jia Li,Jiwen Chen,Feng Wei,Jing Zhang,Weijie Song,Xi Fan
Flexible tin–lead (Sn–Pb) mixed perovskite solar cells (PSCs) are among the promising flexible photovoltaics, owing to the narrow bandgap (NBG) of Sn–Pb perovskites, flexible and wearable features, and their role as a critical component in all-perovskite tandem photovoltaics. However, the flexible Sn–Pb PSCs suffer from a low power conversion efficiency, no higher than 18.5%, along with limited stability. Herein, we reported an efficient and stable flexible NBG Sn–Pb PSC via an N,N′-carbonyldiimidazole (CDI) passivation strategy. CDI, with strong adsorption energy, preferentially binds to Sn2+ compared with oxygen (O2), thus effectively inhibiting the adsorption of O2 on perovskite surfaces. The transfer of electron density around Sn2+ dramatically decreased, thus suppressing Sn2+ oxidation. The CDI treatments endowed the Sn–Pb mixed films with fewer defects, improved crystallinity, better morphology, and matched energy-level alignment. The flexible Sn–Pb devices exhibited a high PCE of 21.02%. Besides, the devices showed enhanced stability and promoted flexibility. This work provides a pathway to visibly increase the efficiency and stability of the flexible Sn–Pb mixed photovoltaic cells.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xin Wang,Yubing Xu,Yuzhu Pan,Shunjie Chai,Jie Wu,Jingda Zhao,Yuwei Li,Zhiwei Zhao,Qing Li,Jun Wu,Jing Chen,Byung Seong Bae,Jianming Zhou,Ying Zhu,Wei Lei,Xiaobao Xu
Solution-processed lead halide perovskite single crystals (LHPSCs) are believed to have great potential in gamma-ray spectroscopy. However, obtaining low-defect LHPSCs from a solution at low temperatures is difficult compared to obtaining Bridgman single crystals such as CdTe and Si. Herein, noise from the intrinsic defects of LHPSCs is considered as the main problem hindering their gamma-ray detection performance. By isolating the defect-induced holes in LHPSCs via energy barriers, we show that NIN photodiodes based on three types of LHPSCs, i.e., MAPbBr3 (MA = CH3NH3), MAPbBr2.5Cl0.5, and cascade LHPSCs, have demonstrated good energy resolution in the range of 6.7–10.3% for 662 keV 137Cs gamma-ray photons. The noise for >10 mm3 devices is low, in the order of 340–860 electrons, and the electron collection efficiency reaches 23–43%. These results pave the way for obtaining low-cost, large, high energy-resolution gamma-ray detectors at room temperature (300 K).
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