Molecular and Crystal Structure of 7—Hydroxy—6,8—dimethoxyl—coumarin

1　ＩＮＴＲＯＤＵＣＴＩＯＮＣｏｕｍａｒｉｎｉｓｏｎｅｋｉｎｄｏｆｔｈｅｌａｃｔｏｎｅｏｆｏｒｔｈｏ ｈｙｄｒｏｘｙｌｃａｓｓｉａａｃｉｄ .Ｉｔｃｏｍｐｏｓｅｓａｌａｒｇｅｎｕｍｂｅｒｏｆｃｏｕｍａｒｉｃｄｅｒｉｖａｔｅｓｅｒｉｅｓｂｅｃａｕｓｅｏｆｔｈｅｄｉｆｆｅｒｅｎｔｐｏｓｉｔｉｏｎｓ,ｋｉｎｄｓａｎｄｎｕｍｂｅｒｓｏｆｔｈｅｓｕｂｓｔｉｔｕｅｎｔｇｒｏｕｐｓｗｈｉｃｈｌｉｎｋｕｐｗｉｔｈｔｈｅａｒｏｍａｔｉｃａｎｄｌａｃｔｏｎｅｒｉｎｇｓ[1 ,2 ,3] .Ｔｈｉｓｋｉｎｄｏｆｃｏｍｐｏｕｎｄｓｅｘ…     

Synthesis of 4—Aryl—3,4—dihydropyrimidinones Using Microwaveassisted Solventless Biginelli Reaction

Ｉｎｔｒｏｄｕｃｔｉｏｎ4 Ａｒｙｌ 3,4 ｄｉｈｙｄｒｏｐｙｒｉｍｉｄｉｎｏｎｅｓ (4)ａｓａｃｏｒｅｗｅｒｅｏｂｓｅｒｖｅｄｉｎｓｏｍｅｂｉｏｌｏｇｉｃａｌｌｙｉｍｐｏｒｔａｎｔｃｏｍｐｏｕｎｄｓ .1Ｍｏｒｅｒｅｃｅｎｔｌｙ ,ｄｉｈｙｄｒｏｐｙｒｉｍｉｄｉｎｏｎｅｓａｒｅｓｈｏｗｎｔｏｂｅａｕｓｅｆｕｌｔｏｏｌｆｏｒｓｔｕｄｙｉｎｇｄｙｎａｍｉｃｃｅｌｌｕｌａｒｐｒｏｃｅｓｓａｎｄｃａｎｂｅｃｏｎｓｉｄｅｒｅｄａｓａｎｅｗｌｅａｄｆｏｒｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆａｎｔｉ ｃａｎｃｅｒｄｒｕｇ…     

Synthesis and Crystal Structure of Dinuclear Zinc（II） Complex with 3—Me—N—oxopyridine—2—thiol

1　ＩＮＴＲＯＤＵＣＴＩＯＮＳｔｕｄｉｅｓｏｆｔｈｅｃｏｏｒｄｉｎａｔｉｏｎｃｈｅｍｉｓｔｒｙｏｆｚｉｎｃ(ＩＩ)ｈａｖｅａｒｏｕｓｅｄｍｏｒｅａｎｄｍｏｒｅｉｎｔｅｒｅｓｔｉｎｌａｓｔｄｅｃａｄｅｉｎｖｉｅｗｏｆｔｈｅｉｒｂｉｏｌｏｇｉｃａｌｍｏｄｅｌｉｎｇａｐｐｌｉｃａ ｔｉｏｎｓ[1 ,2 ] ａｎｄｓｏｌｉｄ ｓｔａｔｅｍａｔｅｒｉａｌｓ[3 ,4] .ＷｅｈａｖｅｂｅｅｎｉｎｔｅｒｅｓｔｅｄｉｎｔｈｅｓｔｕｄｙｏｆｔｒａｎｓｉｔｉｏｎｍｅｔａｌｃｏｍｐｌｅｘｅｓｏｆＮ ｏｘｏｐｙｒｉｄｉｎｅ 2 ｔｈｉｏｌ(…     

Synthesis and Structure of Inclusion Complex of Cyclomaltoheptaose（β—Cyclodextrin）with m—Aminophenol

ＩｎｔｒｏｄｕｃｔｉｏｎＳｕｐｒａｍｏｌｅｃｕｌｅｉｓａｋｉｎｄｏｆｓｙｓｔｅｍｗｉｔｈｓｐｅｃｉａｌｓｔｒｕｃ ｔｕｒｅｄｅｐｅｎｄｉｎｇｏｎｔｈｅｗｅａｋｍｏｌｅｃｕｌａｒｉｎｔｅｒａｃｔｉｏｎｓ (ｓｕｃｈａｓｖａｎｄｅｒＷａａｌｓ ,ｈｙｄｒｏｇｅｎｂｏｎｄ ,ｅｌｅｃｔｒｏｓｔａｔｉｃａｎｄｈｙ ｄｒｏｐｈｏｂｉｃｉｎｔｅｒａｃｔｉｏｎｓ) .Ｔｈｅｗｅａｋｉｎｔｅｒａｃｔｉｏｎｓａｒｅｒｅｌａｔｅｄｔｏｂｉｏｌｏｇｉｃａｌｐｒｏｃｅｓｓｅｓ ,ｆｏｒｅｘａｍｐｌｅ ,ｔｈｅｃａｔａｌｙｔｉｃｒｅａ…     

Preparation of the Solid Electrolytes Li4＋xAlxSi1—xO4—yAl2O3 by the Sol—Gel Method and Study of Their Ionic Conductivity

ＩｎｔｒｏｄｕｃｔｉｏｎＬｉｔｈｉｕｍｉｏｎｃｏｎｄｕｃｔｏｒｓａｒｅｐｒｏｍｉｓｉｎｇｍａｔｅｒｉａｌｓｆｏｒｍａｎｙｋｉｎｄｓｏｆｅｌｅｃｔｒｏｃｈｅｍｉｃａｌａｐｐｌｉｃａｔｉｏｎ ,ｓｕｃｈａｓｅｌｅｃ ｔｒｏｌｙｔｅｓｆｏｒｈｉｇｈ ｅｎｅｒｇｙｄｅｎｓｉｔｙｂａｔｔｅｒｉｅｓ .1Ｔｈｅｐｒｏｐｅｒｔｉｅｓｏｆｈｉｇｈｉｏｎｉｃｃｏｎｄｕｃｔｉｖｉｔｙ ,ｈｉｇｈｄｅｃｏｍｐｏｓｉｔｉｏｎｐｏｔｅｎｔｉａｌ,ｓｔａｂｉｌｉｔｙａｎｄｃｏｍｐａｔｉｂｉｌｉｔｙａｇａｉｎｓｔｅｌｅｃｔｒｏｄｅｓｓ…     

Preparation and X—ray Crystal Structure of Di—chloro—bis（p—t—butylphen

ＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓｋｎｏｗｎｔｈａｔｄｉａｌｋｙｌｓｕｌｆｉｄｅｓａｒｅｅｆｅｃｔｉｖｅｅｘｔｒａｃｔａｎｔｓｆｏｒｔｈｅｅｘｔｒａｃｔｉｏｎａｎｄｓｅｐａｒａｔｉｏｎｏｆｎｏｂｌｅｍｅｔａｌｓ〔１，２〕．Ｐａｌａｄｉｕｍｃｏｍｐｌｅｘ...     

Synthesis and Crystal Structure of a β—Lactam Derivative of 2,4—Diary

１ＩＮＴＲＯＤＵＣＴＩＯＮ１,５ｂｅｎｚｏｔｈｉａｚｅｐｉｎｅｓｐｏｓｅｓｐｏｔｅｎｔｉａｌｂｉｏｌｏｇｉｃａｌａｃｔｉｖｉｔｉｅｓ〔１〕．ＣｙｃｌｏａｄｄｉｔｉｏｎｒｅａｃｔｉｏｎｓａｔｔｈｅｉｒＣ＝Ｎｄｏｕｂｌｅｂｏｎｄｈａｖｅａｒｏｕｓｅｄｃ...     

Separation and Structure of Chiral S—Malic Acid Hydrate

ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｍｅｔｈｏｄｏｆｓｅｐａｒａｔｉｎｇａｒａｃｅｍｉｃｍｉｘｔｕｒｅｉｎｔｏｉｔｓｅｎａｎｔｉｏｍｅｒｓｔｈｒｏｕｇｈｔｈｅｆｏｒｍａｔｉｏｎｏｆｄｉａｓｔｅｒｅｏｍｅｒｉｃｍｏｌｅｃｕｌａｒｃｏｍｐｌｅｘｂｙｒｅａｃｔｉｏｎｗｉｔｈａｎｏｐｔｉｃａｌｌｙａｃｔｉｖｅｃｏｍｐｏｕｎｄｈａｓｂｅｅｎｗｉｄｅｌｙｉｎｖｅｓｔｉｇａｔｅｄ .Ｆｒｏｍｔｈｅｐｏｉｎｔｏｆｖｉｅｗｏｆｃｒｙｓｔａｌｌｏｇｒａｐｈｙ ,ａｎｅｓｓｅｎｔｉａｌｐｒｅｒｅｑｕｉｓｉｔｅｏｆｔｈｅｓｕｃｃ…     

Reducing Olefins in FCC Gasoline by Isomerization and Aromatization over Modified Nano—ZSM—5

Ｔｈｅｒａｐｉｄｄｅｖｅｌｏｐｍｅｎｔｏｆａｕｔｏｍｏｂｉｌｅａｎｄｔｈｅｇｒｅａｔｌｙｉｎｃｒｅａｓｅｄｃｏｎｓｕｍｐｔｉｏｎｏｆｆｕｅｌｈａｖｅｃａｕｓｅｄｍｏｒｅａｎｄｍｏｒｅｓｅｒｉｏｕｓａｉｒ ｐｏｌｌｕｔｉｏｎｂｙｔｈｅｅｍｉｓｓｉｏｎｏｆｔａｉｌｇａｓ[1 ,2 ] .Ｔｏｒｅｄｕｃｅｔｈｅｅｍｉｓｓｉｏｎｏｆｔａｉｌｇａｓｆｒｏｍ ｇａｓｏｌｉｎｅ ｐｏｗｅｒｅｄｅｎｇｉｎｅｓ,ｇｏｖｅｒｎｍｅｎｔｓａｌｌｏｖｅｒｔｈｅｗｏｒｌｄｈａｖｅｔｉｇｈｔｅｎｅｄｒｅｇｕｌａｔｉｏｎｓｏｎｔｈｅｃｏ…     

Monitoring the Hydrolysis of p—Nitrophenyl Acetate Catalyzed by Seryl—histidine with Electrospray Ionization Mass Spectrometry

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｔｈｅｐａｓｔｄｅｃａｄｅ ,ｉｔｗａｓｆｏｕｎｄｔｈａｔｔｗｏａｍｉｎｏａｃｉｄｒｅｓｉｄｕｅｓ ,ＳｅｒａｎｄＨｉｓ ,ｗｏｒｋａｓｔｈｅａｃｔｉｖｅｓｉｔｅｓｉｎｔｈｅｓｅｒ ｉｎｅｐｒｏｔｅａｓｅ .1 3 Ｉｎｏｕｒｐｒｅｖｉｏｕｓｗｏｒｋ ,ａｄｉｐｅｐｔｉｄｅｓｅｒｙｌ ｈｉｓｔｉｄｉｎｅ (Ｓｅｒ Ｈｉｓ)ｗａｓｆｏｕｎｄｔｏｈａｖｅｔｈｅｐｒｏｔｅｉｎａｎｄｎｕ ｃｌｅｏｓｉｄｅｓｃｌｅａｖａｇｅａｃｔｉｖｉｔｙ .4 7ｐ Ｎｉｔｒｏｐｈｅｎｙｌａｃｅｔａｔｅ (ｐ ＮＰＡ)ｗ…     

Extraction of rare earth elements with phosphoryl-containing lariat crown ether in the presence of ionic liquids

Interfacial distribution of rare earth elements (REE) La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y between aqueous solutions of their nitrates and solutions of the lariat crown ether 1,4,10,13-tetraoxa-7,16-diaza(diphenylphosphinylmethyl)cyclooctadecane in dichloroethane was studied in the presence of the ionic liquids 1-butyl-3-methylimidazolium hexafluorophosphate and 1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide. The stoichiometry of extracted complexes was determined; the effect of HNO₃ concentration in the aqueous phase and the nature of extractant and ionic liquid on the extraction efficiency of REE(III) was considered.     

Extraction of rare earths and scandium by 2-phosphorylphenoxyacetic acid amides in the presence of ionic liquids

The distribution of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Sc between aqueous solutions of their salts and solutions of 2-phosphorylphenoxy acid amides in dichloroethane containing an ionic liquid (1-butyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide) have been studied. Metal ion extraction has been found to increase considerably in the presence of this ionic liquid in the organic phase. The stoichiometries of extractable complexes have been determined. The influence of aqueous HNO₃ concentration and of the nature of extractant and ionic liquid on the efficiency of REE(III) and scandium(III) recovery to the organic phase has been considered.     

二(2,4,4-三甲基戊基)膦酸在中空纤维膜器中萃取镱、铒及传质研究

中空纤维膜萃取技术是将液液萃取过程与膜过程相结合的新型分离技术．二（２,４,４三甲基戊基）膦酸（ＨＢＴＭＰＰ,ＨＬ）萃取稀土及其它高价金属离子时所需水相酸度低,反萃容易,加之空间位阻等因素,很可能成为优于２乙基己基膦酸单２乙基己基酯（ＨＥＨ／...     

La0.5R0.5Ba2Cu3O7,Pr0.5R0.5Ba2Cu3O7以及RBa2Cu3o7（R=稀土）的键共价性计

使用复杂晶体化学键理论计算了Ｌａ０．５Ｒ０．５Ｂａ２Ｃｕ３Ｏ７（Ｒ＝Ｐｒ,Ｎｄ,Ｓｍ,Ｅｕ,Ｇｄ,Ｄｙ,Ｙ,Ｈｏ,Ｅｒ,Ｔｍ,Ｙｂ,Ｌｕ）（Ｌａ－Ｒ１２３）,Ｐｒ０．５Ｒ０．５Ｂａ２Ｃｕ３Ｏ７（Ｒ＝Ｌａ,Ｎｄ,Ｓｍ,Ｅｕ,Ｇｄ,Ｄｙ,Ｈｏ,Ｙ,Ｅｒ,Ｔｍ,Ｙｂ,Ｌｕ）（Ｐｒ－Ｒ１２３）以及ＲＢａ２Ｃｕ３Ｏ７（Ｒ＝Ｌａ,Ｐｒ,Ｎｄ,Ｓｍ,Ｅｕ,Ｇｄ,Ｄｙ,Ｈｏ,Ｙ,Ｅｒ,Ｔｍ）（Ｒ１２３）中Ｃｕ－Ｏ键的键共价性,结果表明Ｐｒ－Ｒ１２３,Ｌａ－Ｒ１２３,以及Ｒ１２３都应具有超导性,而实验结果是Ｌａ０．５Ｐｒ０．５Ｂａ２Ｃｕ０７,Ｒ０．５,Ｐｒ０．５Ｂａ２Ｃｕ３Ｏ７（Ｒ＝Ｌａ,Ｎｄ,Ｓｍ,Ｅｕ,Ｇｄ）无超导性,产生这种矛盾的原因尚不明确,需要做进一步的研究。     

Extraction of rare-earth nitrates by phosphoryl podands

The distribution of trace amounts of rare-earth nitrates between aqueous solutions of NH₄NO₃ and organic solutions of phosphoryl podands is studied for Ln = La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y. The stoichiometry of the extraction complexes is determined. The effect of the structure of the extractant and the nature of the organic solvent on the efficiency of rare-earth recovery to the organic phase is considered.     

Effect of ionic liquids on the extraction of rare-earth elements by bidentate neutral organophosphorus compounds from chloride solutions

The partition of microamounts of lanthanide chlorides (Ln = La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y) between aqueous HCl and organic solutions of tetraphenylmethylenediphosphine dioxide, diphenyl(diethylcarbamoylmethyl)phosphine oxide, and dibutyl(diethylcarbamoylmethyl)phosphine oxide was studied in the presence of ionic liquids (ILs): 1-butyl-3-methylimidazolium hexafluorophosphate and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. The stoichiometry of extracted complexes was determined. The effect of the aqueous HCl concentration, the nature of the extractant, and the organic diluent on the efficiency of lanthanide extraction was studied.     

1-(2-pyridylazo)-2-naphthol (PAN) as extractant in solid-liquid extraction of some trivalent rare earth elements

In the present paper, solid-liquid extraction behaviour of RE(III) (RE La, Ce, Pr, Nd, Sm, Gd, Dy and Yb) by the use of 1-(2-pyridylazo)-2-naphthol (PAN, HL) as an extractant in paraffin (m.p. 48 approximately 50 degrees) has been investigated at 80 +/- 0.07 degrees. The effect of equilibrium time, pH of aqueous phase, concentration of extractant in paraffin and solid diluent as well as buffer solution used on the extraction efficiency of RE(III) have been discussed. The extraction reaction is RE(3+) + 2HL(o) + Cl(-) <==> REL(2)Cl(o) + 2H(+).     

Composés d'addition des chlorures de terres rares avec le méthanol,l'éthanol et le propanol-2. Préparations,solubilités et réactions de transsolvatation

By reaction of hydrated rare earths chlorides (M = La, Nd, Sm, Gd, Dy, Er, Yb, Y) with orthoformates, the following adducts have been prepared: MCl₃· 4MeOH, MCl₃ ·3EtOH (M = La, Nd, Sm, Gd, Yb), MCl₄ · 4 EtOH (M = Dy, Er, Y); adducts MCl₃ · 3iso-PrOH have been prepared by successive action of methyl orthoformate and of 2-propanol. The solubilities of these adducts in the corresponding alcohols at 25° (for the lanthanum adducts equally at 0 and 50°) are given. Two examples of the transsolvatation of these compounds, yielding adducts with weakligands, are described.     

Studies on complexation and solvent extraction of lanthanides in the presence of diaza-18-crown-6-di-isopropionic acid

Stability constants of some lanthanides with K22DAP (diaza-18-crown-6-diisopropionic acid) were determined by potentiometric titration method. The logarithmic values of these constants for La(III), Nd(III), Sm(III), Gd(III), Tb(III), Dy(III), Er(III), and Lu(III) are 11.14, 11.43, 11.78, 11.74, 11.95, 12.09, 11.49, and 10.88, respectively. Solvent extraction studies were carried out on the K22DAP complexes of La(III), Nd(III) and Lu(III) using TTA (thenoyltrifluoroacetone) as an extractant in different diluents. It appears that nitrobenzene, a diluent with high dielectric constant, favors the extraction of the complexes. Extraction rates of the K22DAP complexes of lanthanides were investigated at pH 5.5 and 8.0 with TTA in chloroform. The rates of extraction are found to be dependent upon the nature of the extracted species. Competitive extractions were carried out to see if selective extractions could be achieved.     

Exponential sensitivity and speciation of Al(III), Sc(III), Y(III), La(III), and Gd(III) at fused silica/water interfaces

The binding contants, adsorption free energies, absolute adsorbate number densities, and interfacial charge densities of Al(III), Sc(III), Y(III), La(III), and Gd(III) interacting with fused silica/water interfaces held at pH 4 were determined using second harmonic generation and the Eisenthal χ((3)) technique. By examining the relationship between the measured adsorption free energies and the electric double layer interfacial potential at multiple electrolyte concentrations, we elucidate the charge state and possible binding pathways for each ion at the fused silica surface. Al(III) and Sc(III) ions are found to bind to the fused silica surface as fully hydrated trivalent species in a bidentate geometry. In contrast, the Y(III), La(III), and Gd(III) ions are each shown to adsorb to the silica surface in a decreased charge state, but the extent and mode of binding varies with each ion. By quantifying the exponential sensitivity of the surface coverage of the adsorbed ions to their charge state directly at the fused silica/water interface, we provide benchmarks for theory calculations describing the interactions of metal ions with oxide interfaces in geochemistry and hope to improve the prediction of trivalent metal ion transport through groundwater environments.