JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2020
·
IF 3.306
Muhammad Amir Masood,Yuncong Chen,Shankun Yao,Shumeng Li,Weijiang He,Zijian Guo
A new BODIPY based Pd (II) complex, Pd-BDPA has been developed as a dual fluorometric and colorimetric probe for the detection of sulfide anion. The sensing ability is based on the interaction affinity of the Pd (II) towards the sulfide anion which is highly selective and immediate with a detection limit of 240 nM. The interaction between Pd (II) and sulfide is not only highly selective over the other common anions but also not interfered by their coexisting. This selective interaction between them leads to the regeneration of free ligand resulting in the dramatic changes in both fluorescence and absorption spectra. The fluorescent changes lead to quenching the emission spectra which is linear with the concentration of sulfide in the range of 1-10 μM. In addition to fluorescence quenching, the interaction also resulted in the significant color switching from purple to blue which was easily distinguished by the naked eye. Another important advantage is that the Pd-BDPA coated paper-based strips show the sulfide selectivity and sensitivity by the color changes as is in the solution form, revealing its practical utility more conveniently. In addition, the Pd-BDPA probe can also successfully be utilized for the determination of sulfide in real water samples with satisfactory recovery results indicating its feasibility for environmental samples.
研究领域:
分析化学
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环境科学
·
生物化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 6
·2609-2616
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IF 0
Qingshan Zhao,Yuanzhi Zhu,Zhen Sun,Yang Li,Guoliang Zhang,Fengbao Zhang,Xiaobin Fan
In this study, we develop a facile strategy to combine an organic amine with a palladium complex on graphene oxide (GO) as a cooperative catalyst for Tsuji–Trost allylation. A tertiary amine and palladium–diamine complex are simultaneously immobilized on a GO support through silylation and further in situ coordination processes. PdCl2 is employed as the palladium precursor, with no necessity for extra coordination ligands. Various characterizations confirm the successful preparation of the cooperative supported catalyst (GO–NEt2–2N–Pd). Systematic investigation reveals the immobilized palladium–diamine complex (GO–2N–Pd) with very low Pd loading is effective for Tsuji–Trost allylation, and incorporation of the tertiary amine shows a significant promoting effect towards the catalytic activity. GO–NEt2–2N–Pd can be readily recovered and recycled several times without reduction of its efficiency. Its excellent performance should be ascribed to synergistic catalysis effect, excellent support properties, and robust immobilization interaction.
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Lina Guo,Ligang Yan,Ruijun Xie,Limin Han,Ning Zhu
In this work, we investigate a palladium complex exhibiting aggregation-induced emission enhancement (AIEE) properties and remarkable solvatochromism behavior driven by structural changes arising from solvent-solute interactions. Specifically, in polar aprotic solvents, the color of the Pd complex changes from blue to purple as solvent polarity increases, accompanied by a blue shift in the UV–Vis spectrum. Notably, this blue shift is even more pronounced in polar protic solvents, which also show a significant increase in fluorescence emission. These effects are likely driven by hydrogen-bond interaction between the protic solvents and the Pd complex. Density Functional Theory (DFT) calculations show that increased solvent polarity significantly alters the electronic distribution of the Pd complex. Higher solvent polarity leads to a higher orbital transition energy, resulting in a blue shift in the UV–Vis absorption spectrum. X-ray single-crystal structure analysis further reveals that hydrogen-bonding interactions between the Pd complex and methanol stabilize its planar structure. When water is introduced, the Pd complex undergoes aggregation through non-covalent interactions, which modify the stacking arrangement. This change weakens the π-π interactions between adjacent molecules, thereby minimizing energy loss in the system. Consequently, the Pd complex effectively utilizes the AIEE mechanism to detect water content in methanol.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Haibin Yuan,Hui Liu,Fen You,Xiaochao Shi
Palladium complexes bearing new tridentate quinolino-based [N − NN ox ] ligands were synthesized and tested for the polymerization of norbornene. Upon activation of MAO, all the palladium complexes showed high catalytic activities for the vinyl-addition polymerization of norbornene up to 11.5 × 10 6 g of PNB (mol of Pd) −1 h −1 . The structure–activity relationships in the polymerization of norbornene, namely steric and electric effects of the ligands, were carefully investigated.
研究领域:
有机化学
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高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
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2014
·
IF 2.212
Xiao-Li Tang,Ai-Qing Ma,Guo-Qiang Cai,Long-Guan Zhu
Three complexes with same components, PdII, 2-sulfobenzoate and 1,10-phenanthroline, [Pd(phen)2]⋅2(2-Hsb) (1), [Pd(phen)2](2-Hsb)⋅(2-Hsb)⋅2H2O (2), and [Pd(phen)2]⋅[Pd(phen)(2-sb)2]⋅6H2O (3), where 2-H2sb is 2-sulfobenzoic acid and phen is 1,10-phenanthroline, were synthesized and characterized by IR spectra, elemental analyses, thermogravimetric analyses, UV–vis absorption spectra and powder X-ray analysis. Single X-ray crystal structural analyses showed that 1 and 2 are ionic species, while 3 is a dimer through weak bonding interactions. In 1 and 2, 2-Hsb− ligands are partly deprotonated and it is fully deprotonated in 3. In 2 and 3 there are hydrogen bonds and π–π interactions. Extended hydrogen bonding structures for 2 and 3 are 1-D and 3-D architectures, respectively. The oxidation of methyl phenyl sulfide by 1-3 as homogeneous catalysts gave high conversion and selectivity in methanol. The addition of 2-sulfobenzoic acid in the catalytic reaction further promotes the conversion.
研究领域:
化学
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材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 19
·15017-15028
·
IF 4.6
Li Xie,Jingyi Shen,Qing Shu,Weihong Ge,Xiuhua Yang,Ahad Hussian,Xuejun Kang
Methotrexate (MTX) is a drug that has long been used in high doses as an anti-cancer drug and lately in low doses as a treatment for autoimmune diseases. It is necessary to be determined in various matrices because the drug has a narrow therapeutic range and a high persistence in the environment. Since MTX and its polyglutamate metabolites (MTXPGs) have strong polarity and the potential to be converted during sample processing, rapid and efficient extraction of these targets has provided technical challenges for development of analytical methods for them. A new Pd(II)/polyethyleneimine (PEI)/polystyrene (PS) nanofibre was prepared and characterized by X-ray diffraction, FTIR spectroscopy, thermal analysis, scanning electron microscopy and transmission electron microscopy, etc. The nanofibre was applied as a sorbent to extract MTX and MTXPGs in whole blood and MTX in urine and water. The extracted analytes were then desorbed by a water solution containing 10% methanol and 20% ammonium hydroxide (v/v) and eventually quantified by high performance liquid chromatography. The peak area of the target substances in the extraction solution and its concentration were linear in the range of 20.0 (∼37.8 to 1000 ng/mL); intraday and interday RSD were 4.6–6.4% and 5.7–14.6%, respectively. The detection limit of this method was 6.0–11.3 ng/mL. The results showed that the method can be used for the determination of MTX and MTXPGs in human whole blood and MTX in urine/water samples.
研究领域:
分析化学
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药物分析
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2017
·
IF 0
Weiqiang Zhang,Liangyi Peng,Chunyan Deng,Yingxue Zhang,Hao Qian
Polymers containing the structure of N-heterocyclic carbenes (NHCs) have attracted much interest due to their superior complexing ability to metal ions and good recyclability, which make them promising candidates as solid supporters. Herein, we developed an easy method to synthesize polyimidazolium chloride salt (PImCl) via one-step method in mild conditions. After PImCl was chelated with palladium chloride in 3-chloropyridine, this NHC-Pd polymer was employed as the solid catalyst for Suzuki reactions of aryl bromides and phenylboronic acid. The catalytic activity of the NHC-Pd polymer was high for many different substrates. Moreover, the Suzuki reaction of 4-bromoanisole with phenylboronic acid could be catalyzed by this NHC-Pd polymer in mild conditions. Furthermore, this solid catalyst could be easily isolated by centrifugal separation. After several recycling runs, the catalytic activity decreased little. Compared with the conventional methods, this method was much simpler and more efficient, which showed enormous potential in preparing new heterogeneous supporter of porous polyimidazolium chloride salt.
研究领域:
有机化学
·
催化化学
✓ 已验证
产品关联
DOI
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2016
·Vol. 217
·期 24
·2726-2735
·
IF 2.495
Huiliang Sun,Shuren Zhang,Yike Yang,Xiao Li,Hongmei Zhan,Yanxiang Cheng
Six aryl Pd(II) bromide complexes based on perylene diimide derivative (Ar) and phosphine mixed-ligands are successfully synthesized by directly oxidative addition of Ar–Br to the Pd(0) precursor. These complexes with the general formulas ArPdBr(PCy 3 ) 2 (PCy 3 = tricyclohexylphosphine; Pd1–Pd3 ) and [ArPdBr(TXP-2,4)] 2 (TXP-2,4 = tri-2,4-xylylphosphine; Pd4–Pd6 ) are stable and can be handled in air at room temperature. By employing the Pd(II) complexes as initiators, Suzuki catalyst transfer polymerization (SCTP) of AB-type fluorene monomer is investigated for preparing polyfluorenes (PFs) with the defined end group. Complexes Pd4–Pd6 with auxiliary TXP-2,4 ligand can initiate polymerization of AB-type fluorene monomer at room temperature, while higher polymerization temperature is required for Pd1–Pd3 with alkyl phosphine PCy 3 . The obtained polymers are analyzed by matrix-assisted laser desorption ionization-time-of-flight mass spectrometry, which confirms that the Ar group is appended to the terminus of the polymer chain. Moreover, PFs prepared by Pd4–Pd6 -catalyzed SCTP bear precisely the Ar group on one chain end and 4- tert -butylphenyl end-capping group on the opposite end, which indicates that Pd4–Pd6 with the bulky TXP-2,4 exhibit better catalytic performance in SCTP. Photoluminescence spectra of the obtained polymers show a dual or a blue emission resulting from the difference of the molecular weight.
研究领域:
高分子化学
·
有机合成
·
功能材料
·
聚合反应机理
·
光电子材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2020
·
IF 2.463
Ning Liu,NiNa Qiao,Feng-Shou Liu,ShaoHua Wang,Ying Liang
To explore high efficiency of the Suzuki-Miyaura reactions, an easily prepared heterogeous palladium precatalysts bearing sterically bulky α-diimine was covalently supported on graphene oxide (GO). The characterization of supported palladium complex was discussed in detail. A simple and efficient protocol for Pd-catalyzed cross coupling was described, which revealed that the bulky α-diimine ligand is crucial to promote the C Ar -C Ar transformation. This immobilized system provides a straightforward access to a wide range of aryl bromides with excellent functional groups tolerance.
研究领域:
化学
·
材料科学
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 12
·7355-7370
·
IF 3.917
Dong Yahao,Bi Jiajun,Zhu Dajian,Meng Di,Ming Shujun,Guo Wen,Chen Zhen,Liu Qian,Guo Lei,Li Tao
Due to their eco-friendly nature, polysaccharides are desirable supporting materials in organic transformations. Nevertheless, as is the case for other supports, polysaccharides have to face the issue of seeking more binding sites via multifunctional structures to capture metal species in the catalyst, which enhance stability and promote catalytic performance in aforementioned process. In this paper, an environmentally-friendly and multifunctional cellulose supported Pd(II)-Schiff base complex is fabricated and applied in the formation of different biaryls under mild ambient conditions. The results of thermal analysis reveal that the composite has high thermal stability. The as-prepared catalyst demonstrates to be a robust and efficient catalyst with more than 90% yields in H 2 O: EtOH (1:1) at 70 °C by using 0.30 mol% of catalyst under air towards the coupling of various substituted aryl halides and phenylboronic acids. Moreover, identified by ICP-OES analysis, the green Pd(II) catalyst displays higher metal content (1.93%) in comparison with the direct deposition of Pd particles on cellulose (0.93%), and prevents the metal leaching (< 1%) via the coordination interaction of multiple capturing sites (–OH, Schiff base and pyridyl moieties) with palladium. The resultant catalyst is characterized by FT-IR, TGA, XRD, SEM, TEM, XPS, CP/MAS 13 C-NMR, and ICP-OES examination. Also, this green catalyst is able to be retrieved in five cycles with simple centrifugation. Notably, we propose a plausible multifunctional catalyst complex. The present study offers a novel and effective supported catalyst, which broadens the contributions of polysaccharides in green catalysis. Graphic abstract
研究领域:
高分子化学
·
绿色化学
·
有机催化
·
材料化学
·
环境友好材料
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2011
·Vol. 13
·期 10
·2939-2947
·
IF 5.472
Guang Li,Hengquan Yang,Wei Li,Guoliang Zhang
An IPr-functionalized (IPr = N,N′-bis(2,6-diisopropylphenyl)imidazol-2-ylidene, a N-heterocyclic carbene ligand) mesoporous ethane-silica was synthesized through a co-condensation of IPr-bridged triethoxysilane and bis(triethoxysilyl)ethane. This functionalized mesoporous ethane-silica was characterized with N2 sorption, XRD, FT-IR, solid NMR and XPS. Owing to high surface area, large pore volume and organically functionalized surface, such a material can be used as a scaffold to design surface NHC-Pd [NHC = N-heterocyclic carbene] complexes. By variation of Pd precursors and/or ancillary ligands, a library of NHC-Pd complexes on the solid surface were tentatively created. It was found that the Pd precursor and ancillary ligands had significant impacts on the activities of the resultant heterogeneous catalysts in the Suzuki–Miyaura coupling of aryl chlorides. Surface NHC-Pd complexes with acetylacetonate (acac) and 3-chloropyridine as ancillary ligands are the most active. A wide range of aryl chlorides even with deactivated and sterically hindered groups were successfully coupled over this solid catalyst under the mild conditions at a relatively low loading of Pd (80 °C, 0.5 mol% Pd). This solid catalyst could be reused 10 times without a significant decrease in activity. This study not only provides the most efficient phosphine-free solid catalyst for the Suzuki–Miyaura couplings of less reactive substrates, but also demonstrates a noteworthy example that IPr-functionalized ethane-silica can be used as a versatile scaffold to create various active surface NHC-metal catalysts.
研究领域:
催化化学
·
有机合成
·
材料化学
·
绿色化学
·
均相与多相催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）