Synthesis,structure and near-infrared luminescence of a new 2D praseodymium(Ⅲ) coordination polymer

A novel coordination polymer,[Pr2(BIPA)3(H2O)2].2H2O(1)(H2BIPA=5-bromoisophthalic acid),was prepared by hydrothermal synthesis and characterized by IR spectroscopy,elemental analysis and single-crystal X-ray diffraction.The crystal was of monoclinic system,space group C2/c,with a=1.98037(14),b=1.44189(14),c=2.15281(18) nm,β=95.220(2)°,V=6.1218(9) nm3,C24H17Br3O16Pr2,Mr=1082.93,Dc= 2.350 g/cm3,F(000)=4096,μ=7.136 mm-1 and Z=8.The final R1=0.0608 and wR2=0.1371 for 5624 observed reflections(I>2σ(I)).Complex 1 featured an interesting 2D layer containing {Pr2(CO2)3}n right-handed and left-handed helical chains.Furthermore,hydrogen bonds linked the adjacent 2D layers to form a 3D supramolecular framework.Moreover,the near-infrared luminescent properties of 1 were also investigated in the solid state.     

Microwave assisted synthesis, spectroscopy and biochemical aspects of lanthanum(Ⅲ) and praseodymium(Ⅲ) complexes with oxadiazole functionalised dithiocarbazinates

The new lanthanum (Ⅲ) and praseodymium (Ⅲ) complexes of the general formula [Ln(L)3] (Ln=La(Ⅲ) or Pr(Ⅲ); LK=potassium salt of dithiocarbazinates) were prepared by both, conventional thermal and by the use of microwave technology. Elemental analyses, elec-trical conductance, magnetic moment and electronic, infrared, far-infrared, 1H and 13C NMR spectral studies were used to characterize the complexes. The molecular weights of few complexes were determined by FAB-mass spectra. Nephelauxetic ratio, covalency parameter and bonding parameter for these complexes were also calculated. The probable structures of the complexes were proposed. The antifungal and antibacterial activities of the complexes were evaluated. The activities were correlated with the structures of the compounds.     

Adsorption and desorption properties of D151 resin for Ce(Ⅲ)

The present research is aimed at the development of D151 resin as an adsorbent that it can be used in the adsorption of Ce(Ⅲ) ions.The adsorption and desorption behaviors of Ce(Ⅲ) on D151 resin have been investigated by chemistry analysis.The influence of operational conditions such as contact time,initial concentration of Ce(Ⅲ),initial pH of solution and temperature on the adsorption of Ce(Ⅲ) had also been examined.The results show that the optimal adsorption condition of D151 for Ce(Ⅲ) was achieved at pH=6.50 in HAc-NaAc medium.The maximum uptake capacity of Ce(Ⅲ) was 392 mg/g resin at 298 K.The adsorption of Ce(Ⅲ) followed both the Langmuir isotherm and Freundlich isotherm,and the correlation coefficients had been evaluated.Even kinetics on the adsorption of Ce(Ⅲ) had been studied.The adsorption rate constant k298 K valued was 1.3×10-5 s-1.The calculation data of thermodynamic parameters which ΔS0 value of 91.34 and ΔH0 value of 7.07 kJ/mol indicate the endothermic nature of the adsorption process.While,a decrease of Gibb’s free energy(ΔG0) with increasing temperature indicated the spontaneous nature of the adsorption process.Finally,Ce(Ⅲ) could be eluted by using 0.5 mol/L HCl solution and the elution percentage was as high as 100%.Adsorption mechanism was also proposed for the adsorption of Ce(Ⅲ) ions onto D151 resin using infrared spectroscopy technique.     

Synthesis, structure and photoluminescent properties of a new Eu(Ⅲ) complex with 5-bromoisophthalic acid

The self-assembly of 5-bromoisophthalic acid (H2BIPA) with Eu(NO3)3·6H2O under the hydrothermal conditions gave a 3D coordination polymer, Eu2(BIPA)3(CH3CH2OH) (1), which was characterized by elemental analysis, IR and single-crystal X-ray diffraction. Complex 1 displayed an unusual three-dimensional network of a rare (4,6)-connected (48.66.8)2(44.62)2(42.84) topology, which was different from Eu2(BDC)3(H2O)2 (BDC=isophthalate), because the -Br substituent of the isophthalate resulted in the different electronic effects and the steric hindrance to change the coordination modes of carboxylate groups in the assembled process. Moreover, the luminescent properties of 1 were also investigated in the solid state.     

Adsorption behavior of ytterbium (Ⅲ) on gel-type weak acid resin

The adsorption and desorption behaviors of Yb(Ⅲ) on gel-type weak acid resin (110) were investigated. The influence of operational conditions such as contact time,initial concentration of Yb(Ⅲ),initial pH of solution and temperature on the adsorption of Yb(Ⅲ) were also examined. The results showed that the optimal adsorption condition of 110 resin for Yb(Ⅲ) was achieved at pH=5.5 in HAc-NaAc medium. The maximum uptake capacity of Yb(Ⅲ) was 265.8 mg/g at 298 K. Yb(Ⅲ) could be eluted by using 3.0 mol/L HCl solution and the 110 resin could be regenerated and reused. The adsorption of Yb(Ⅲ) followed the Langmuir isotherm,and the correlation coefficients were evaluated. Various thermodynamic parameters such as standard enthalpy change (△H),standard entropy change (△S) and standard free energy change (△G) were evaluated. The adsorption of Yb(III) on the 110 resin was found to be endothermic in nature. Thomas model was successfully applied to experimental data to predict the breakthrough curves and to determine the characteristics parameters of the column useful for process design. And the resin sample both before and after adsorption was described by IR spectroscopy.     

Study on the adsorption of lanthanum(Ⅲ) from aqueous solution by bamboo charcoal

The adsorption behaviors of La(Ⅲ) ion on bamboo charcoal were investigated with various chemical methods and IR spectrometry. Parameters studied include the effects of pH,average particle size,initial ion concentration,contact time and temperature by batch method. The results showed that bamboo charcoal could remove La(Ⅲ) ions effectively from aqueous solution. The loading of La(Ⅲ) ions was strongly dependent on pH of the medium and the optimal adsorption condition was in HNO3-TEA medium with pH value of 7.20. In the batch system,the modified bamboo charcoal exhibited the highest La(Ⅲ) ion uptake as 120 mg/g at 298 K,at an initial pH value of 7.20. The adsorption kinetics were tested with Lagergren-first-order model and pseudo-second-order model. The adsorption data were conformed to the Langmuir and Freundlich isotherms,and the correlation coefficients had been evaluated. Thermodynamic parameters such as free energy(ΔG) ,which were all negative,indicated that the adsorption of La(Ⅲ) ion onto bamboo charcoal was spontaneous and the positive value of enthalpy(ΔH) showed that the adsorption was endothermic in nature. Thomas model was applied to experimental column data to determine the characteristic parameters of column useful for process design. The characterization of both before and after adsorption of La(Ⅲ) ion on bamboo charcoal was undertaken using IR spectroscopic technique. The results revealed that bamboo charcoal was a good choice as a biosorbent for the recovery of lanthanum from aqueous solution.     

Synthesis and Crystal Structure of a 4f-3d Complex [La(DMF)_6(H_2O)_3][Cr(CN)_6]·2H_2O

Ｒｅｃｅｎｔｌｙ ,ｔｈｅｒｅｈａｓｂｅｅｎｃｏｎｓｉｄｅｒａｂｌｅｉｎ ｔｅｒｅｓｔｉｎｌａｎｔｈａｎｉｄｅ(Ⅲ )ｈｅｘａｃｙａｎｏｆｅｒｒａｔｅｓａｎｄｔｈｅａｎａｌｏｇｏｕｓｃｏｂａｌｔ(Ⅲ )ａｓｗｅｌｌａｓｃｈｒｏｍｉｕｍ(Ⅲ )ｃｏｍｐｌｅｘｅｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｐｏｔｅｎｔｉａｌａｓｃａｔａｌｙｔｉｃ ,ｓｅｍｉｃｏｎｄｕｃｔｉｖｅ ,ａｎｄｍａｇｎｅｔｉｃｍａｔｅ ｒｉａｌｓ[1～ 4] .Ｆｏｒｅｘａｍｐｌｅ ,ｍａｇｎｅｔｉｃｓｔｕｄｉｅｓｏｎａｓｅｒｉｅｓｏｆｔｈｒｅｅ ｄｉｍｅｎｓｉｏ…     

Effect of Lanthanum（ Ⅲ ） on Cytosolic Free Calcium in Isolated Rabbit Mature Osteoclasts

Theformationandresorptionofboneismain tainedbytheinteractionsofosteoblasts(OBs)withos teoclasts(OCs),andafunctionalimbalancebetween themmaycausethelossofbonemass.OCsaremulti nucleatedcellsformedbythefusionofmononuclear progenitorsofthemonocyte macrophagef…     

Lanthanum(Ⅲ) sorption studies on poly[dibenzo-18-crown-6] and its separation from uranium(Ⅵ) and thorium(Ⅳ) in L-valine medium

The sorption study of La(Ⅲ) was carried out on poly[dibenzo-18-crown-6] and L-valine medium. The quantitative adsorption of La(Ⅲ) was found at 1x10-2 to 1x10-5 mol/L L-valine. The various eluting agents were found efficient eluents for La(Ⅲ). The capacity of crown polymer for La(Ⅲ) was found to be 0.43 ±0.01 mmol/g. The tolerance limit of various cations and anions for La(Ⅲ) was determined.La(Ⅲ) was quantitatively separated from other metal ions in binary as well as multicomponont mixtures. The study was extended to sequen-tial separation of La(Ⅲ), U(Ⅵ) and Th(Ⅳ). The good separation yields were obtained and had good reproducibility (±2%). The method in-corporated the determination of La(Ⅲ) in real sample. The method was simple, rapid and selective.     

Enhancing water repellence and mechanical properties of antibacterial gelatin/Ce(Ⅲ) fiber by heat treatment

The water repellence and mechanical properties of the gelatin/Ce(Ⅲ) fiber(GCe fiber) were improved by heat treatment,which was an easy and non-toxic method.The microscopic morphology,mechanical properties,antibacterial activity,and cell culture of the GCe fibers by heat treatment(HGCe fiber) were investigated.It was found that the water repellence and mechanical properties of the HGCe fibers increased significantly along with temperature increase.SEM observation showed that HGCe fibers had a fairly smooth surface and a compact structure.Detailed characterization revealed that the HGCe fibers exhibited similar antibacterial activity with the GCe fibers against Staphylococcus aureus.In addition,the results of cell culture by morphological assessment and methylthiazolyl tetrazolium assay(MTT assay) indicated the good biocompatibility of GCe fibers.Therefore,the HGCe fibers could be a promising candidate biomaterial for biomedicine applications.     

Association of a terpyridine ligand with lanthanide and copper(Ⅱ) nitrates

Reactions between the 1,3-bis(6-methylpyridin-2-yl) pyridine ligand L,C17H15N3 and LnIII(1a,1b,1c,1d) or a mixture of LnIII and CuII nitrates(2a,2b,2c,2d) resulted in a series of respectively novel mono-and heterodinuclea r complexes,where LnIII=Sm(a) ,Eu(b) ,Tb(c) ,Dy(d) . The compounds were char acterized by elemental analysis,ESI-MS and IR spectra,furthermore we obtained crystals of [H2L][Eu(NO3) 5](1b) and [CuL2][Eu(NO3) 5](2b) suitable for XRD char acterization. In the crystal structures the Eu ions are 10-coordinated with quit e a narrow range of Eu-O distances which are between 0.2436 and 0.2556 nm. In 1b the ligand molecule is protonated in both terminal rings,and the N-H groups ar e involved in the N-H…O hydrogen bonds with the same oxygen atom of one of the nitro groups. These hydrogen bonds connect the ions in 1b into the complex which is the principal building block of the structure. In 2b the [CuL2]2+ counterion s are present;the Cu is octahedrally coordinated by all nitrogen iatoms of two L molecules which are therefore almost perpendicular to each other. The electros tatic interactions between the charged species are in both cases the main drivin g force of the crystal packing.     

Synthesis of 2, 6-Bis(1′-Phenyl-3′-Methyl-5′-Oxopyrazole-4′) Pyridinediacyl and Its Solid-Liquid Extraction Behavior for Ce(Ⅲ)

1 Ｐｈｅｎｙｌ 3 ｍｅｔｈｙｌ 4 ａｃｙｌｐｙｒａｚｏｌ 5 ｏｎｅｄｅｒｉｖａｔｉｖｅｓａｒｅｗｅｌｌｋｎｏｗｎａｓβ ｄｉｋｅｔｏｎｅｔｙｐｅｃｈｅｌａｔｉｎｇｌｉｇａｎｄｓｃｏｏｒｄｉｎａｔｉｎｇｔｏａｍｅｔａｌｉｏｎｗｉｔｈｏｘｙｇｅｎａｔｏｍｓａｓ“ｈａｒｄ”Ｌｅｗｉｓｂａｓｅｓ .Ｄｏｎｇｅｔａｌ .[1 ] ａｎｄＹａｎｇｅｔａｌ .[2 ] ｗｅｒｅｓｙｎｔｈｅ ｓｉｚｅｄａｓｐｅｃｉａｌｆａｍｉｌｙｏｆｂｉｓ( 4 ａｃｙｌｐｙｒａｚｏｌ 5 ｏｎｅ)ｄｅｒｉｖａｔｉｖｅｓ ,ｉｎｗｈｉｃｈ ,ｔｗｏ 1 …     

Preparation and Long Persistence Red Luminescence of M_ (0.2)Ca_(0.8)TiO_3∶Pr ~(3 ) (M=Mg~(2 ), Sr~(2 ), Ba~(2 ), Zn ~(2 )

Inthe 1990s ,newaluminatelongafterglowphos phorswerereported ,theluminescenceintensityandtheafterglowpersistencearemuchhigherthanthatofthetraditionalsulfide .Moreover ,theydonotcontainradiativeelementandhasgoodstructuralstability .Therehasbeenincreasinginterestonthenewphos phorsovertheworld .Thewideanddeepresearchonthisnewmaterialhasbeenmadeinrecentyears[1～ 3] .Nowadays ,thegreenandbluephosphorescencephos phorscanbesuccessfullypreparedwhichlastsmorethan 30and 12hrespectively[4 ] .Ithasalread…     

Preparation of CaS∶Eu~(2 ), Sm~(3 ) by Solid Reaction Method and Its Photostimulated Luminescence

Thereisanurgentneedonopticalstoragemateri alswiththedevelopmentoflaserandopticalstoragetechnologyinrecentyears .Electrontrappingopticalstoragematerials (ETM )isanewtypeofopticalstor agematerials .Theybasicallyarewide band gapⅡ Ⅵsemi conductorcompoundsdopedwithtwotypesofselectedrareearthelementsthathavegroundstatesandexcitedstateswithinthewidebandgapoftheⅡ Ⅵsemiconductorcompoundhostmaterials .Lighten ergyisstoredinthiskindofmaterialbyexposingittoultravioletorvisiblelightandisreleasedthro…     

Fe3O4@SiO2磁性吸附剂的制备及其对Er(Ⅲ)和Ho(Ⅲ)的吸附性能

稀土资源的开采伴随着稀土离子排放,对水资源造成了严重污染。吸附法是处理水相稀土离子污染的一种高效技术,磁性吸附剂能够加速固液分离,具有较大的研究价值。本研究以FeCl₃·6H₂O、甘醇、醋酸钠、聚乙二醇(PEG2000)等为原料,采用溶剂热法在200℃的条件下制备粒径约为230 nm的Fe₃O₄磁性纳米颗粒,将其加入正硅酸乙酯中,利用氨水水解聚合,即可形成粒径约为300 nm的Fe₃O₄@SiO₂磁性吸附剂材料。此复合材料为核壳结构,包含Fe₃O₄和SiO₂两种晶型结构。SiO₂的包覆未对Fe₃O₄物相结构产生较大影响,在包覆的同时能够显现出一定的磁性性能。此复合材料对Er(Ⅲ)和Ho(Ⅲ)的最大吸附容量分别达到10.03 mg/g和5.25 mg/g。     

Electroreduction of Y(Ⅲ)in Molten Chlorides and Alloying

The electroreduction of Y(Ⅲ)on tungsten electrode in NaCl-KCl-YCl_3 melt has been investi-gated by cyclic voltammetry.Deposition of Y(Ⅲ)to Y(0)is reversible in one step.The cyclic voltammetry,convolution voltammetry,potential-time curve after potentiostatic electrolysis and X-ray diffraction analy-sis were used to study the electrode process of Y(Ⅲ)reduced on iron electrode.Several Y-Fe intermetalliccompounds are formed before the deposition of metallic yttrium.The diffusion coefficient anddiffusion activation energy of Y in Y_6Fe_(23) were determined by current-time curve at potential step.The results indicate the diffusion of Y in its alloy phase is so slow that this step will control the electrode pro-cess.     

A comparison between Ce(Ⅲ) and Ce(Ⅳ) ions in photocatalytic degradation of organic pollutants

Nano cerium oxides are efficient photocatalysts for pollutants degradation with highly dispersed Ce(III) ions as the suggested active species to promote the reaction, while Ce(IV) species do not behave as a catalyst. In this paper, to understand the mechanism of Ce-based photocatalysts, we studied the comparison of simple cerium ions, Ce(III) and Ce(IV) in aqueous solution for organic pollutants degradation under UV irradiation. Orange II(AOII), methyl orange, and p-nitrophenol were selected as the target pollutants. The formation and contribution of reactive oxygen species, the kinetics of Ce(IV) photoreduction and Ce(III) photooxidation, and the influence of solution p H were investigated in detail. It was found that at low p H Ce(IV) ions showed a higher activity for hydroxyl radicals production and AOII degradation than Ce(III) ions, which could be attributed to its fast reduction rate to Ce(III). However, its activity dramatically decreased when solution p H increased, and was also strongly influenced by the type of pollutants; while Ce(III) exhibited high degradation efficiency of all the tested pollutants over a wide pH range.     

Study on Rare Earth Electrolyte of Ce_(0.9)RE_(0.1)O_(2-δ) (RE=Pr, Nd, Sm, Gd, Dy)

Thesolidelectrolyteisakeycomponentofsolidoxidefuelcell (SOFC) .Dopedceriaisoneofpromis inghigh conductingsolidelectrolyteinSOFC[1,2 ] .Butitiswell knownthatitisdifficulttosinterdopedceriabysolidstatereactioninair .TheCe0 .9RE0 .1O2 -δelectrolytematerialswerepreparedbythesol gelmethod .Thesinteringtemperatureofthesamplescandecreasetoabout 4 0 0K .Theionicconductivityandlinearthermalexpansionpropertiesofsol gelpreparedCe0 .9RE0 .1O2 -δinawidetemperaturerangewerein vestigated .Thepowder…     

Extraction and separation of Nd(Ⅲ), Sm(Ⅲ), Dy(Ⅲ), Fe(Ⅲ), Ni(Ⅱ), and Cs(Ⅰ) from concentrated chloride solutions with N,N,N’,N’-tetra(2-ethylhexyl) diglycolamide as new extractant

The feasibility of using N,N,N’,N’-tetra(2-ethylhexyl)diglycolamide(TEHDGA) in 75 vol.% n-dodecane-25 vol.% n-octanol as agents for the extraction and separation of Nd(III), Sm(III), Dy(III), Fe(III), Ni(II), and Cs(I) from concentrated chloride solution was investigated. Different extraction behaviors were obtained towards rare earth elements(REE) studied and Fe(III), Ni(II) and Cs(I). Efficient separation of Nd(III), Sm(III) and Dy(III) from Fe(III), Ni(II), and Cs(I) was achieved by TEHDGA, depending on the HCl, HNO3 or H2SO4 concentration. A systematic investigation was carried out on the detailed extraction properties of Nd(III), Sm(III), and Dy(III) with TEHDGA from chloride media. The IR spectra of the extracted species were investigated.