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Flotation performance of anisic hydroxamic acid as new collector for tungsten and tin minerals

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Journal of Central South University 2022年第11期29卷 3645-3655页

作者： ZHAO Gang ZHOU Xiao-tong LI Fang-xu FU Guang-qin SHANG Xing-ke Institute of Resources Utilization and Rare Earth Development Guangdong Academy of SciencesGuangzhou 510650China State Key Laboratory of Rare Metals Separation and Comprehensive Utilization Guangzhou 510650China

In order to improve the recovery of tungsten ores containing tin minerals,anisic hydroxamic acid(p-methoxy benzohydroxanic acid,PMOB)was synthesized and introduced as novel collector in the flotation of scheelite,wolframite and *** flotation performance and adsorption mechanism were investigated by micro/batch flotation,zeta potential measurements and density functional theory(DFT).The micro flotation results showed that the recoveries of scheelite,wolframite and cassiterite using PMOB as collector are 97.45%,95.77% and 90.08%,respectively,and the corresponding recoveries are 91.00%,84.30% and 84.67% for benzohydroxamic acid(BHA).The batch flotation results revealed that the collector dosage could be reduced by about 45% for PMOB compared with BHA,in the case of similar flotation *** potential measurements indicated that PMOB could be adsorbed on the mineral surfaces by ***,density functional theory(DFT)calculation results showed that the substituent group—OCH_(3)endues PMOB stronger electron donation ability and hydrophobicity compared with benzohydroxamic acid(BHA),pmethyl benzohydroxamic acid(PMB)and p-hydroxyl benzohydroxamic acid(PHB).

关键词： flotation hydroxamic acid scheelite wolframite cassiterite

A hydroxamic acid Anchoring Group for Durable Dye-Sensitized Solar Cells Incorporating a Cobalt Redox Shuttle

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A Hydroxamic Acid Anchoring Group for Durable Dye-Sensitized...

Synthesis and spectroscopic characterization of fluorescent solid rare-earth complexes with hydroxamic acids

第五届新型太阳能电池学术研讨会

作者： Ning Cai Hiroshi Imahori School of Chemical Engineering and Light Industry Guangdong University of Technology

In our previous work1,we explored a porphyrin dye with a robust tropolone anchoring group for durable dye-sensitized solar cells(DSSCs).However,the studies were conducted with the I/I redox shuttle solely owing to the potential fear that the strong binding ability of tropolone to metals present also imparts undesirable side effects,which lowers the cell ***,exploration of anchoring groups suitable for transition-metal-based redox shuttles is a challenge toward practical *** this study,A hydroxamic acid group has been employed for the first time as an anchoring group for cobalt-based DSSCs(Figure 1).The porphyrin dye YD2-o-C8 HA including a hydroxamic acid anchoring group exhibited a power conversion efficiency(η) of 6.4 %,which is close to that of YD2-o-C8,a representative porphyrin dye incorporating a conventional carboxylic *** importantly,YD2-o-C8HA was found to be superior to YD2-o-C8 in terms of both binding ability to TiO and durability of cobalt-based ***,YD2-o-C8HA photocells revealed a higher η-value(4.1%) than YD2-o-C8(2.8%) after 500 h *** results suggest that the hydroxamic acid can be used for DSSCs with other transition-metal-based redox shuttle to ensure high cell durability as well as excellent photovoltaic performance.

关键词： anchoring group cobalt dye-sensitized solar cells hydroxamic acid porphyrins

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Rare Metals 2002年第3期21卷 163-169页

作者： LI Yangsheng and LI FanFaculty of Chemistry and Materials Science, Nanchang University, Nanchang 200437, China Faculty of Chemistry and Materials Science Nanchang University Nanchang 330047

The complexes RE_2(DHYA)_3 centre dot nH_2O in the title bar were synthesizedthrough some reactions of trivalent rare-earth ions. In the process of synthesis, dihydroxamicacids were taken as ligands while the alcohol was taken as a solvent. The ligands includedadipylhydroxamic acid (ADHA), p-phthalichydroxamic acid (PPHA), oxalohydroxamic acid (OXHA),butadihydroxamic acid (BDHA), o-phthalichydroxamic acid (OPHA), benzoylhydroxamic acid (BHA), *** at 25 deg C, the molar conductances in various modes are 13.00-21.05 S centre dot cm^2centre dot mol^(-1), which shows that rare-earth complexes are nonelectrolytes and the hydroxaminogroups of the complexes have taken part in bonding. Infrared spectra, ultraviolet spectra, nuclearmagnetic resonance (~1HNMR) spectra, and fluorescence spectra were used to investigate thecomplexes. Experiments have proved that the complexes of En^(3+)and Tb^(3+) with aromatic hydroxamicacids have good fluorescent characteristics.

关键词： hydroxamic acid complex rare earth

Synthesis,O_2-binding ability and catalytic oxidation performance of cobalt(Ⅱ) complexes with dihydroxamic acid functionalized N-pivot lariat ethers

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Chinese Chemical Letters 2015年第1期26卷 100-102页

作者： Xing-Yue Wei Xing-Min Wang Ning Li Sheng-Ying Qin College of Environmental and Biological Engineering Chongqing Technology and Business University Key Laboratory of Catalysis and Functional Organic Molecule Department of Chemistry.Sichuan University

Novel Co（Ⅱ） complexes with dihydroxamic acids functionalized N-pivot lariat ether CoL^1-CoL^4 were synthesized and *** oxygenation constants（ln K_（O2）） and thermodynamic parameters（△H°,△S°） were *** their catalytic performance in oxidation of p-xylene to p-toluic acid（PTA） was *** enhancement of O_2-binding and catalytic oxidation activity by the oxa aza crown ether ring of the cobalt complexes were discussed.

关键词： Aza-crown ether hydroxamic acid Cobalt complexes Dioxygen affinities Catalytic oxidation

Synthesis of a Novel Chiral Trihydroxamic acid Containing L-Pro-L-Ala-L-Ala-β-(HO)Ala-OMe Unit

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Chinese Chemical Letters 2006年第6期17卷 751-754页

作者： Lang Tao SHEN Ting YANG Hong Yu LI Zhi Fu LUO National lsotope Center of Engineering and Technology China Institute of Atomic EnergyBeijing P. O. Box 275 （58） Beijing 102413 Medical Isotope Research Center Peking University Beijing 100083

An N-hydroxyl peptide unit of H-L-Pro-L-Ala-L-Ala-β-（BnO）Ala-OMe was synthesized by stepwise chain building method in solution. Then, based on nitrilotriacetic acid backbone and this N-hydroxyl peptide unit, a novel chiral tripodal ligand P as an analogue of desferrichrome, has been synthesized. In neutral pH, ligand P formed stable tri（hydroxamato）- iron（Ⅲ） complexes which showed a maximum absorptiota （∑max=2750 M^-lcm^-1） at 422 nm in UV-Vis spectra. The characteristic absorption spectra are similar to those of natural trihydroxamate-type siderophores.

关键词： hydroxamic acid siderophores tripodal ligand chelators iron.

Synthesis and Crystal Structure of 2,2'-Dihydroxy-[1,1']binaphthalenyl-3,3'-bis-hydroxamic acids

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Chinese Journal of Structural Chemistry 2012年第3期31卷 438-442页

作者：黄婉云陈自卢秦愫妮刘冬成梁福沛 State Key Laboratory of Coordination Chemistry Coordination Chemistry InstituteSchool of Chemistry and Chemical EngineeringNanjing University State Key Laboratory Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources College of Chemistry&Chemical EngineeringGuangxi Normal University

The first synthesis and structural characterization by X-ray crystallography of racemic 2,2＇-dihydroxy-[1,1＇]binaphthalenyl-3,3＇-bis-hydroxamic acids were *** com-pound（C28H30N4O8,Mr = 550.56） crystallizes in orthorhombic system,Fdd2 space group with a = 13.055（3）,b = 34.871（7）,c = 12.570（3） ,V = 5722（2） 3,Z = 8,Dc = 1.278 g/cm3,λ = 0.71073 ,μ（MoKα） = 0.095 mm-1,F（000） = 2320,S = 1.021,R = 0.0349 and wR = 0.0802 for 1757 observed reflections with I 〉 2σ（I）.The N-H and O atom are involved in two-dimensional intermolecular hydrogen bond nets,which further stabilize the structure.

关键词： hydroxamic acid 1-binaphthyl compound crystal structure synthesis

Oxoarylation of ynamides with N-aryl hydroxamic acids

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Chinese Chemical Letters 2021年第8期32卷 2551-2554页

作者： Changwei Chen Hongyu Zhang Gang Xu Sunliang Cui College of Pharmaceutical Sciences Zhejiang UniversityHangzhou 310027China College of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310058China

Ynamides are electron-rich alkynes with unique reactivities and act as flexible building blocks in organic ***,the investigation for transformation of ynamides with exceptional selectivity and efficiency is attractive and ***,we report an oxoarylation of ynamides with N-aryl hydroxamic *** the presence of catalytic Cu(OTf)_(2),both the terminal and internal ynamides could undergo an addition/[3,3] sigmatropic rearrangement cascade with N-aryl hydroxamic acids to achieve oxoarylation,along with providing selective entry to(ortho-amino)arylacetamides and ***,deuterium-labelling reaction and gram-scale reaction were conducted to probe the mechanism and showcase the scalability.

关键词： Ynamide hydroxamic acid Oxoarylation Oxindole Rearrangement

Quantitative Structure-Permeation Relationships for hydroxamic acids Transport across Biological Membrane

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Quantitative Structure-Permeation Relationships for Hydroxam...

Synthesis, Characterization and in vitro Antitumour Activity of the Di-n-butyltin(IV) Complexes of Some Arylhydroxamates

13th Asian Chemical Congress

作者： PANDE,Rama RAJWADE,P.Ram School of Studies in chemistry Pt.Ravishankar Shukla UniversityRaipurChhattisgarhIndia-492010

In this study,biological membrane such as inner layer of the egg of Gall domesticus(hen) was used as controlling barriers for permeation of some drug like molecule hydroxamic acids with different molecular weight and ... 详细信息

关键词： Apparent permeability logD QSPR hydroxamic acid PCA and PLS

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Chinese Journal of Chemistry 2002年第5期20卷 453-461页

作者：魏春英杨频王联红王丽 Institute of Molecular Science Shanxi University Taiyuan Shanxi 030006 China

Fourteen new di n butyltin(IV) complexes of hydroxamic acids of the formula Bu 2 SnL 2 (HL=hydroxamic acids) were synthesized by the reaction of Bu 2 SnO and hydroxamic acids in dry toluene and ethanol media. The compounds were characterized by elemental analyses, molecular weight, IR and 1 H NMR spectroscopy. The results indicate that n Bu 2 SnL 2 have distorted trans octahedral structure. The antitumor activity in vitro against human A 549 tumor cells and P388 leukemia was presented, and their structure activity relationship was discussed.

关键词： diorganotin hydroxamic acid antitumour activity