- Homochiral porous lanthanide phosphonates with 1D triple-strand helical chains: Synthesis, photoluminescence, and adsorption properties
-
Four homochiral porous lanthanide phosphonates, [Ln(H2L) 3]·2H2O, (H3L = (S)-HO 3PCH2-NHC4H7-CO2H, Ln = Tb (1), Dy (2), Eu (3), Gd (4)), have been synthesized under hydrothermal conditions. These compounds are isostructural, and they possess a 3D supramolecular framework built up from 1D triple-strand helical chains. Each of the helical chain consists of phosphonate groups bridging adjacent Ln(III) ions. The helical chains are stacked through hydrogen bonds to form 1D tubular channels along the c axis. Moreover, helical water chains are located in the 1D channels, and after removal of these water chains, the compounds exhibit selective adsorption capacities for N2, H2O, and CH 3OH molecules. Compounds 1 and 3 show strong green and red fluorescent emissions, respectively, in the solid state at room temperature. Crystal data for 1: TbP3O17N3C 18H37, tetragonal (No.76), space group P41, a = 12.4643(3) A, b = 12.4643(3) A, c = 18.7577(5) A, V = 2914.17(13) A3, and Z = 4. For 2: DyP3O 17N3C18H37, a = 12.4486(3) A, b = 12.4486(3) A, c = 18.7626(5) A, V = 2907.60(13) A3, and Z = 4. For 3, EuP3O17N 3C18H37, a = 12.4799(3) A, b = 12.4799(3) A, c = 18.8239(5) A, V = 2931.78(13) A3, and Z = 4. For 4: GdP3O17N3C18H 37, a = 12.4877(18) A, b = 12.4877(18) A, c = 18.824(4) A, V = 2935.5(8) A3, and Z = 4.
- Yue, Qi,Yang, Jin,Li, Guang-Hua,Li, Guo-Dong,Chen, Jie-Sheng
-
-
Read Online
- Polyol-mediated synthesis and luminescence properties of CePO4:Tb3+ nanospindles
-
Tb3+-doped CePO4 nanospindles were synthesized via a polyol method and characterized by X-ray diffraction (XRD), transmission electron microcopy (TEM), as well as photoluminescence (PL) spectra. The results show that the as-prepared
- Li, Feng,Wang, Meng,Mi, Congcong,Yi, Kuiyu,Xu, Shukun
-
-
Read Online
- Intercalation of lanthanide cations to a layer-like metal-organic framework for color tunable white light emission
-
One gallium carboxylate of MOF (Ga2(OH)4(C9O6H4) or MIL-124) has been synthesized by a facile solvothermal approach, and the luminescence was tuned by encapsulating lanthanide(iii)(Ln3+) cations into the channels through the active-COOH group in MIL-124 post-synthesis. PXRD, TEM, FTIR, and TGA were performed to determine the structure and thermal stability of the obtained products. The photophysical properties of these Ln3+ incorporated products are studied in detail, whose luminescent color can be tuned by controlling the composition of different Ln3+ cations in MOF. Furthermore, with careful adjustment of the excitation wavelength and concentration of the Ln3+ cations, the color of the luminescence can be modulated, and dichromatic (MIL-124@Eu3+) and trichromatic (MIL-124@Eu3+/Tb3+) white-light-emission can indeed be achieved. One of the optimized chromaticity coordinates in white-light-emission is (0.3693, 0.3362) which is very close to the value for ideal white-light (0.333, 0.333). The versatile luminescence, good thermal stability, and compatibility with aqueous conditions reveal that these materials based on MOF may have some potential applications in luminescent devices for display or lighting. This journal is
- Xu, Xiao-Yu,Yan, Bing
-
-
Read Online
- Synthesis, crystal structure and properties of two ternary rare earth complexes with aromatic acid and 1,10-phenanthroline
-
Two dimeric rare-earth complexes [Eu(o-MOBA)3phen]2·2H2O (1), [Tb(o-MOBA)3phen]2·2H2O (2), (where o-MOBA = o-methoxybenzoate, phen = 1,10-phenanthroline) were synthesized and structurally c
- Zhao, Na,Wang, Shu-Ping,Ma, Rui-Xia,Gao, Zhi-Hua,Wang, Rui-Fen,Zhang, Jian-Jun
-
-
Read Online
- Study of the luminescence properties of a novel rare earth complex Tb(DPC)22H2O
-
Rare earth complex Tb(DPC)22H2O was synthesized by introducing Pyridine-2,6-dicarboxylic acid(H2DPC) as the ligand and characterized by UV, fluorescent and infrared spectra as well as elemental analysis. The complex exhibi
- Lv, Yuguang,Li, Qiuping,Shi, Chunhui,Liu, Hairan,Liu, Fenghua,Wu, Lili,Wu, Dongmei,Liu, Hong,Xie, Jie
-
-
Read Online
- Preparation and thermal properties of lanthanide complexes with 2,3-dichlorobenzoic acid and 1,10-phenanthroline
-
Three lanthanide complexes with a general formula [Ln(2,3-DClBA) 3phen]2 (Ln(III) = Eu(1), Tb(2), Ho(3); 2,3-DClBA = 2,3-dichlorobenzoate; phen = 1,10-phenanthroline) were synthesized and characterized by elemental analysis, molar conductance, infrared and ultraviolet spectra and powder X-ray diffraction (XRD). The luminescent properties of the complexes 1 and 2 were studied. The thermal behaviors of the complexes were also discussed by thermogravimetric (TG), differential thermogravimetric (DTG) and infrared spectra (IR) techniques. The heat capacities of the complexes were measured from 259.15 to 493.02 K by means of Differential scanning calorimeter (DSC). The dependence of heat capacity on the reduce temperature x (x = [T - (Tmax + Tmin)/2]/[(Tmax - Tmin)/2]) was fitted to a polynomial equation with the least squares method for each complex. Furthermore, based on the fitted polynomial, the smoothed heat capacities and the derived thermodynamic functions (HT - H 298.15 K), (ST - S298.15 K) and (GT - G298.15 K) in the measured temperature range were obtained with an interval of 10 K.
- Wang, Juan-Fen,Ren, Ning,Meng, Fan-Tao,Zhang, Jian-Jun
-
-
Read Online
- Synthesis, crystal structure and luminescence properties of two novel lanthanide coordination polymers containing double chain
-
Two novel lanthanide(III) two-dimensional (2D) coordination polymers [Ln2(PDC)2(OH)2(H2O)2] · H2O (Ln = Eu (1) and Tb (2), H2PDC = pyridine-3,4-dicarboxylic acid) have been prepa
- Song, Hui-Hua,Li, Ya-Juan
-
-
Read Online
- Preparation and luminescence characteristics of the europium and terbium complexes incorporated into a silica matrix using a sol-gel method
-
A series of silica-based composite materials incorporating lanthanide bipyridyl (bpy) and phenanthroline (phen) complexes, SiO2:Ln(bpy)23+ and SiO2:Ln(phen)23+ (Ln = Eu, Tb), was prepared by the sol-gel method with luminescence properties studied before and after heat treatment up to 873 K. For the SiO2:Ln(bpy)23+ and SiO2:Ln(phen)23+ composites heated at appropriate temperatures, the energy transfer from the bpy or phen ligands to Ln3+ ions took place smoothly, as for the original complexes, and consequently strong red or green emissions based on Eu3+ and Tb3+ ions were observed. Emission outputs from the lanthanide complexes incorporated into silica gel matrices were intensified by optimizing the concentration of complexes and heat treating at individual temperatures, and the maximum relative emission intensities (vs. Y(P,V)O4:Eu and LaPO4:Ce,Tb phosphors, as practically used) were ca. 15% and 45% for SiO2:Eu(phen)23+ and SiO2:Tb(bpy)23+ composite materials. Furthermore, thermal stability of Ln(bpy)23+ complexes was effectively improved compared with the original lanthanide complexes by incorporation into an SiO2 matrix.
- Jin,Tsutsumi,Deguchi,Machida,Adachi
-
-
Read Online
- Luminescence enhancement of Tb3+ ion in assemblies of amphiphilic linear-dendritic block copolymers: Antenna and microenvironment effects
-
The luminescence enhancement of Tb3+ ion bound to amphiphilic linear-dendritic block copolymers [poly-(acrylic acid)-dendritic polyether, PAA-Dendr.PE] was investigated. Tb3+ ion complexes with a PAA chain of block copolymer to form a supramolecular luminophore. The observed prominent enhancement in luminescence properties can be attributed to two important factors. The antenna effect, energy harvest and transfer from the dendritic polyether subunit to the ground state of the Tb3+ ion, leads to a remarkable increase of luminescence intensity of Tb3+ ion, which enlarges obviously with increasing generation of dendrimer. Furthermore, the unique microenvironment surrounding the Tb3+ ion that derives from multimolecular assembly of copolymer results in a large decrease of the number of water molecules coordinated to Tb3+ from 3.5 to 1.3, which is the other factor to greatly enhance the luminescence intensity of Tb3+ ion.
- Zhu, Linyong,Tong, Xiaofeng,Li, Miaozhen,Wang, Erjian
-
-
Read Online
- Luminescent triazine-containing bridged polysilsesquioxanes activated by lanthanide ions
-
Luminescent lanthanide-complex-bridged polysilsesquioxanes were prepared by sol-gel processing of a monomer with a large heterocyclic bridging group in the presence of lanthanide ions under acidic conditions. SEM, XRD, FTIR, luminescence spectra and luminescence decay analysis were used to characterize the obtained materials. The 5D0 quantum efficiency and the number of the water molecules coordinated to the Eu3+ ion were theoretically estimated on the basis of emission spectra and the lifetime of the 5D0 state. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.
- Lin, Nana,Li, Huanrong,Wang, Yige,Feng, Yu,Qin, Dashan,Gan, Quanying,Chen, Shudong
-
-
Read Online
- Luminescent hybrid materials of lanthanide β-diketonate and mesoporous host through covalent and ionic bonding with anion metathesis
-
Luminescent mesoporous materials were prepared by performing an anion metathesis reaction on ionic liquid modified SBA15, which has imidazolium chloride bridging units. The lanthanide β-diketonate complex anion was successfully anchored onto the SBA15 fra
- Li, Qiu-Ping,Yan, Bing
-
-
Read Online
- Investigation of desolvation process in lanthanide dinicotinates
-
The desolvation process in lanthanide pyridine-3,5-dicarboxylates of the formulae [Tb2pdc3(dmf)2]?dmf (1), [Ho 2pdc3(dmf)2]?dmf (2), [Erdc 3(dmf)2]?dmf (3), and [Yb2pdc 3(dmf)2]?dmf (4) where pdc-C5H 3N(COO) 2 2-, dmf-N,N′-dimethylformamide) has been investigated by means of the TG-DSC, TG-FTIR, IR and XRD methods. Heating of the complexes in the range 30-260 °C lead to evolution of weakly bonded dmf molecules included in the channels as well those directly bonded with lanthanide atoms. The kinetic analysis revealed a multistep desolvation pattern.
- Lyszczek,Iwan
-
p. 633 - 639
(2011/04/22)
-
- Luminescent materials of annealed Eu3+-exchanged zeolite L crystals
-
In this work, we report the luminescence behavior of Eu3+- exchanged zeolite L microcrystals annealed at different temperatures. SEM and XRD techniques were employed to characterize the samples. UV-vis absorption spectroscopy and luminescence spectroscopy were used to study the luminescence properties of the annealed materials. It is shown that Eu3+-exchanged zeolite L crystals are structurally stable at 800 °C, and that its structure is completely collapsed when annealed at 1100 °C. Calcination of Eu3+-exchanged zeolite L crystals at 700 °C leads to a strong violet-blue emission, while a strong red emission is observed when the sample is annealed at 1100 °C. The Royal Society of Chemistry 2010.
- Fang, Yi,Li, Huanrong,Wang, Yu,Liu, Xiuwu
-
p. 11594 - 11598
(2011/02/27)
-
- Synthesis, structure, thermal and luminescent behaviors of lanthanide-Pyridine-3,5-dicarboxylate frameworks series
-
The isostructural series of lanthanide pyridine-3,5-dicarboxylates of the formula [Ln2pdc3(dmf)2]·(dmf) x(H2O)y where Ln are lanthanides from La(III) to Lu(III); pdc2--C5/s
- ?yszczek, Renata
-
p. 120 - 127
(2011/01/08)
-
- Synthesis, crystal structures and properties of a series of three-dimensional lanthanide coordination polymers with the rigid and flexible mixed dicarboxylate ligands of 1,4-benzene dicarboxylic acid and succinic acid
-
A series of new lanthanide coordination polymers, with the formula [Ln(Suc)0.5(p-BDC)] (Ln = Eu (1), Sm (2), Tb (3), Pr (4), Ho (5); H2Suc = succinic acid; p-H2BDC = 1,4-benzene dicarboxylic acid), have been synthesized un
- Wang, Chun-Guang,Xing, Yong-Heng,Li, Zhang-Peng,Li, Jing,Zeng, Xiao-Qing,Ge, Mao-Fa,Niu, Shu-Yun
-
p. 126 - 131
(2009/08/15)
-
- Thermochemical properties of the rare earth complexes with pyromellitic acid
-
Fourteen rare earth complexes with pyromellitic acid were synthesized and characterized by means of chemical and elemental analysis, and TG-DTG. The constant-volume combustion energies of complexes, ΔcU, were measured by a precise rotating-bomb
- Wang, Lijun,Liu, Fei,Yang, Xuwu,Wang, Xiaoyan,Liu, Ruiping,Zhao, Sa,Chen, Sanping
-
-
- Syntheses and characterization of novel lanthanide adamantine-dicarboxylate coordination complexes
-
Hydrothermal reactions of 1,10-phenanthroline (phen), 1,3-adamantanedicarboxylic acid (H2L) and lanthanide chlorides yielded six compounds: [Ln(L)(HL)(phen)] (Ln=Pr, 1; Nd, 2), [Ln(L)(HL)(phen)(H2O)] (Sm, 3; Eu, 4), [Tb(L)(HL)(phen)(
- Li, Xing,Wei, Dan-Yi,Huang, Shi-Jie,Zheng, Yue-Qing
-
-
- Phase equilibrium of the system TbCl3-CdCl2-HCl(7.92 wt %)-H2O at 298.15 ± 0.1 K
-
The equilibrium solubility of the quaternary system TbCl 3-CdCl2-HCl(7.92 mas. %)-H2O was determined at 298K and the corresponding equilibrium diagram was constructed. The quaternary system is complicated by the three equi
- Qiao, Zhanping,Zhuo, Lihong,Chen, Xin,Wang, Hui
-
p. 446 - 449
(2008/10/09)
-
- The mononuclear and dinuclear dimethoxyethane adducts of lanthanide trichlorides [LnCl3(DME)2]n, n=1 or 2, fundamental starting materials in lanthanide chemistry: Preparation and structures
-
Some new dimethoxyethane (DME) adducts of lanthanide trichlorides of formula [LnCl3(DME)2]n, n=1 or 2; (n=2, Ln=La, Ce, Pr, Nd; n=1, Ln=Eu, Tb, Ho, Tm, Lu) have been prepared by treating Ln 2O3, or LnCl3·nH2O, or Ln2(CO3)3, in DME as medium, with thionyl chloride at room temperature, eventually in the presence of water in the case of Ln2O3 and Ln2(CO3)3. The complexes from lanthanum to praseodymium included are chloro-bridged dimers. In the case of neodymium, the new results complement the literature data, showing that both the mononuclear and dinuclear species exist: neodymium can therefore be regarded as the turning element from dinuclear to mononuclear structures along the series. Only mononuclear complexes were isolated in the Eu-Lu sequence. The lanthanide contraction has been evaluated on the basis of the Ln-O and Ln-Cl bond distances on the isotypical series of the mononuclear complexes LnCl3(DME)2 covering a range of 12 atomic numbers.
- Baisch, Ulrich,Dell'Amico, Daniela Belli,Calderazzo, Fausto,Conti, Roberto,Labella, Luca,Marchetti, Fabio,Quadrelli, Elsje Alessandra
-
p. 1538 - 1548
(2008/10/09)
-
- Hydrothermal synthesis and crystal structures of three novel lanthanide coordination polymers with glutarate and 1,10-phenanthroline
-
The first series of lanthanide coordination polymers with glutarate (glu) and 1,10-phenanthroline (phen), [Nd2(glu)3(phen)2]n 1,[Tb(glu)(phen)Cl]n 2 and [Ho(glu)(phen)Cl]n 3, have been prep
- Zhang, Li-Ping,Wan, Yong-Hong,Jin, Lin-Pei
-
p. 169 - 178
(2007/10/03)
-
- Hydrothermal synthesis and characterization of novel lanthanide 2,2′-diphenyldicarboxylate complexes
-
Lanthanide complexes with a one-dimensional chain, [Ln2(dpdc)3(H2O)2]n [Ln = La (1), Pr (2), Eu (3), Tb (4); dpdc = 2,2′-diphenyldicarboxylate] were obtained by hydrothermal reaction of lanthanide(III) chlorides and 2,2′-diphenyldicarboxylic acid, and characterized by X-ray diffraction. The crystal structure data reveal that they are isostructural. In the asymmetric unit, the two Ln3+ ions are both eight-coordinate but they have different coordination environments. Lanthanide ions arranged in a zigzag manner are bridged by the dpdc ligands into a 1-D chain, while the structure appears like a pinwheel viewed along the c axis. In these complexes, 2,2′-diphenyldicarboxylate anions exhibit tetradentate and pentadentate coordination modes. A laser-induced high-resolution spectrum (resolution: 0.2 cm-1) of 3 was obtained, which shows two Eu3+ sites in 3. This is in agreement with the results of single-crystal X-ray diffraction studies of 3. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
- Wang, Yi-Bo,Zheng, Xiang-Jun,Zhuang, Wen-Juan,Jin, Lin-Pei
-
p. 1355 - 1360
(2007/10/03)
-
- Three new lanthanide coordination polymers containing isophthalate and 1,10-phenanthroline
-
Three lanthanide coordination polymers were prepared by hydrothermal synthesis and characterized by single-crystal X-ray diffraction. [Pr 2(mBDC)3(phen)(H2O)]n·0.5n H2O (1) (mBDC = isophthalate, phen = 1,10-phenanthroline) exhibits two kinds of metal environments (coordination numbers 7 and 8). In complex 1, mBDC ligands adopt the tetradentate (bridging and bridging) coordination mode and connect Pr ions into an undulating layer, and a 3D supramolecular structure is formed via hydrogen bonds between adjacent layers. [Tb4(mBDC) 6(phen)]n (2) has three types of metal environments (coordination numbers 6, 7 and 8) and is composed of a 3D network formed by mBDC linking Tb ions via tetradentate (bridging and bridging) and pentadentate (bridging/chelating and bridging) coordination modes. There are two kinds of small quadrilateral channels along the a-axis. [Er4(mBDC) 6(phen)]n (3) is isostructural to complex 2.
- Wan, Yong-Hong,Zhang, Li-Ping,Jin, Lin-Pei
-
p. 253 - 260
(2007/10/03)
-
- First Examples of Ternary Lanthanide 2,2′-Diphenyldicarboxylate Complexes: Hydrothermal Syntheses and Structures of Lanthanide Coordination Polymers of 2,2′-Diphenyldicarboxylic Acid and 1,10-Phenanthroline
-
In the four new lanthanide coordination polymers {[La 2(2,2′-dpdc)3(phen)(H2O)]·2H 2O)n (1), [Eu2(2,2′-dpdc) 3(phen)(H2-O)2]n (2), {[Ln 2(2,2′-dpdc)3(phen)2(H2O) 2]·4H2O},n [Ln = Tb (3), Yb (4)] (2,2′-dpdc = 2,2′-diphenyldicarboxylate, phen = 1,10-phenanthroline), prepared by hydrothermal synthesis, the 2,2′-dpdc dianion affords tetradentate, pentadentate, and hexadentate coordination modes. Complex 1 is a two-dimensional network of infinite 1-D chains assembled through π-π interactions, with nine- and ten-coordinate La3+, and arranged in wave-like layers. In 2, Eu3+ possesses nine- and ten-coordinate geometries bridged by 2,2′-dpdc ligands to give a 3-D structure. The isomorphous complexes 3 and 4, in which Tb3+ and Yb3+ ions are both nine-coordinate, have two-dimensional structures of 1-D zigzag chains stacked via hydrogen bonds and π-π interactions of phen molecules. The high-resolution emission spectrum of 2 shows two Eu 3+ ion sites, which is consistent with the results of the X-ray crystal structure analysis. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
- Wang, Yibo,Zheng, Xiangjun,Zhuang, Wenjuan,Jin, Linpei
-
p. 3572 - 3582
(2007/10/03)
-
- Metal poly(benzimidazol-1-yl)borates. Synthesis and spectral characterization of some lanthanide chelates of hydridotris- and tetrakis(benzimidazol-1-yl)borate anions
-
Complexes of La(III), Nd(III), Pr(III), Sm(III), Tb(III), Dy(III), Ho(III), Er(III) and Yb(III) with hydridotris- and tetrakis(benzimidazol-1-yl) borate anions (L1 and L2) have been prepared and characterized. The spectral parameters β, b1/2, δ% and η, evaluated from the electronic spectra of the Pr, Nd, Sm, Ho and Er complexes, suggest the presence of a weak covalent contribution in the metal-ligand bond. The IR spectral data reveal that both L1 and L2 behave as tridentate ligands coordinating via the pyridyl and pyrrolic nitrogen atoms of the benzimidazolyl groups.
- Khan, Tabrez A.,Khan, M. Arif,Khan,Haq
-
p. 297 - 308
(2008/10/08)
-
- Hydrothermal synthesis and structural studies of novel 2-D lanthanide coordination polymers with phthalic acid
-
This paper presents four lanthanide coordination polymers, [Ln2(BDC)3(H2O)]n (Ln = La, 1; Ln = Eu, 2; Ln = Tb, 3; BDC = 1,2-benzenedicarboxylate) and [Yb4(BDC)6(H2O)2]n (4) prepared by the hydrothermal technique. They are all 2-D infinite structures with BDC anions connecting adjacent metal ions. In complex 1, La(III) ions are eight- and nine-coordinated, and all La(III) ions are coplanar in the 2-D structure. In complexes 2 and 3, Eu(III) and Tb(III) ions are also eight- and nine-coordinated, but they are distributed in a wave-like 2-D network. In complex 4, the Yb(III) ions have four different coordination numbers (6, 7, 8 and 9), which are rarely found in one lanthanide complex. Both the coordination numbers and the arrangement of Ln atoms in these coordination polymers show the lanthanide contraction. In the four complexes, all the oxygen atoms of BDC take part in coordination with Ln(III) ions, adopting tetra-, penta- and hexadentate coordination modes for the phthalate anions. The luminescent properties of complex 2 have been investigated and the results for the explanation of the chemical environment of the Eu(III) ion are consistent with the X-ray analysis.
- Wan, Yonghong,Jin, Linpei,Wang, Kezhi,Zhang, Liping,Zhenga, Xiangjun,Lub, Shaozhe
-
p. 1590 - 1596
(2007/10/03)
-
- Solution enthalpies of hydrates LnCl3·xH2O (Ln=Ce-Lu)
-
Trichlorides of the lanthanide elements Ln=Ce-Lu form: (a) isotypic hexahydrates LnCl3·6H2O with a coordination number (CN) 8 for the Ln3+ ions. (b) Two isotypic groups of trihydrates LnCl3·3H2O, in the first group Ln=Ce-Dy the CN is 8; the structure of the second group Ln=Er-Lu is unknown. With Ho no trihydrate exists; a dihydrate is formed. (c) Two isotypic groups of monohydrates LnCl3·H2O with unknown structure - Ln=Ce-Dy and Ln=Ho-Lu. For all compounds and for anhydrous chlorides LnCl3 solution enthalpies were measured with an isoperibolic calorimeter. The ΔsolH0 values do not depend only on the difference (lattice enthalpies/hydration enthalpies), but also on the state in solution. According to Spedding the CN of the Ln3+ ions against water changes from 9 to 8 between Nd and Sm, causing minima in the series of solution enthalpies. Dihydrates LnCl3·2H2O are found for Ln=Ce, Pr, Nd, Sm and presumably for Eu and Gd. They are not yet well characterised.
- Seifert,Funke
-
-
- Investigation of the kinetics of the fluidized bed process for the dehydration of NdCl3·6H2O, TbCl3·6H2O and DyCl3·6H2O
-
Dehydration of NdCl3·6H2O, TbCl3·6H2O and DyCl3·6H2O was carried out by fluidization in a gas mixture of Ar and HCl. In a series of isothermal experiments the effect of different process parameters was considered. Water vapour pressure of gas leaving the fluidized bed was estimated by using a simple mass balance. It was shown that the rate-limiting step of the overall dehydration process in the fluidized bed is removal of water vapour by a saturated bulk gas flow. However, the saturated gas phase data could not be thermodynamically interpreted. The reason to this is discussed.
- Sundstroem, Johan,Van Hong, Vu
-
-
- Orthorhombic low-temperature modifications of compounds Cs3LnCl6 (Ln = Nd-Yb)-preparation and thermodynamic stability
-
The compounds Cs3LnCl6 (Ln=Nd-Yb) can be obtained from aqueous solutions with an orthorhombic structure /S.G. Pbcm/, whereas from solutions in anhydrous acetic acid a modification with the monoclinic Cs3BiCl6 structure /S.G. C 2/c/ is formed. By solution calorimetry, the orthorhombic phase could be proved to be the low temperature modification. Molar volumes determined from X-ray powder patterns increase from Pbcm to C 2/c. The transition from the orthorhombic into the monoclinic phase is irreversible for kinetical reasons.
- Reuter, Gert,Sebastian, J?rg,Roffe, Mark,Seifert, Hans-Joachim
-
-
- SYNTHESIS AND SPECTRALINVESTIGATION ON RARE EARTH(III0 COMPLEXES OF AMIDO ACID LIGAND DERIVED FROM 2,4-DINITROPHENYLHYDRAZINE
-
Fourteen rare earth(III) complexes REL3.nH2O (where RE = Sc, n=5; Re = Z, La, Ce, Sm, Eu, Gd, Tb, Dy, Ho, Er, Zb, n = 6; RE = Pr, Nd, n =4; HL =1-(N-carboxymethyl-N-phenyl)amino-avetyl-2',4'-dinitrophenylhydrazine), have been synthesized and characterized
- Shen, Xu,Xie, Yuyuan
-
p. 499 - 510
(2008/10/09)
-