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1.
Oxalates of La(III), Ce(III), Pr(III), Nd(III) and Sm(III) with the hydrazinium cation with the general formulae (N2H5)4Ln2(C2O4)57H2O (Ln=La3+, Ce3+, Pr3+) and N2H5Ln(C2O4)2·3.5H2O (Ln=Nd3+, Sm3+) were synthesized. The thermal decompositions of these compounds take place in three stages: thermal dehydration at 65–100°C, exothermic decomposition of the N2H4 at 230–260°C, and oxidation of the oxalate ion.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
2.
Kalinovskaya I. V. Karasev V. E. Zadorozhnaya A. N. Lifar L. I. 《Russian Journal of Coordination Chemistry》2001,27(7):516-519
Europium and terbium mixed-ligand complexes with cinnamic acid of composition Ln(Cin)3· nD · xH2O, where Ln = Eu3+or Tb3+, Cin is a cinnamate ion (C6H5CH=CHCOO–), D = 1,10-phenantroline, 2,2"-dipyridyl, benzotriazole (n= 2, x= 0), triphenylphosphine oxide (n= 1, x= 2), or H2O (n= 0 or 1, x= 0), were synthesized. The compounds were characterized by elemental analysis, IR and luminescence spectroscopy. The Stark structure of the 5
D
0–7
F
j(j= 0, 1, 2) electronic transitions in the low-temperature luminescence spectra of europium complexes was analyzed. IR study has revealed a bidentate coordination of the cinnamate ion in the compounds. 相似文献
3.
A. Kula 《Journal of Thermal Analysis and Calorimetry》2002,68(3):957-964
Complexes of lanthanide(III) (La–Lu) and Y(III) with 1-hydroxy-2-naphthoic acid were obtained as crystalline compounds with
a general formula Ln[C10H6(OH)COO]3⋅nH2O:n=6 for La–Tm and Y, n=2 for Yb and n=0 for Lu. IR spectra of the prepared complexes were recorded, and their thermal decomposition in air were investigated. Spectroscopic
data suggest that in the coordination of metal-organic ligand only oxygen atoms from the carboxylate group take part. When
heated, the complexes decompose to the oxides Ln2O3, CeO2, Pr6O11 and Tb4O7 with intermediate formation of Ln(C11H7O3)(C11H6O3).
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
4.
The synthesis of double oxalates of rare earths(III) and potassium with empirical formulae K4Ln2(C2O4)5·10H2O (Ln=La, Ce) and KLn(C2O4)2· nH2O (wheren=4 for Pr-Dy andn=4.5 for Ho-Lu, Y) is described. The compounds obtained were studied by TG, DTG and DTA over the temperature interval 25–500C and by X-ray powder diffraction and chemical analysis. Three structurally different groups were recognized. It was found that either rare earth oxide or basic carbonate (Ln2O2·CO3) and potassium carbonate were obtained as final product at 500C, depending on the rare earth element. The thermal decomposition takes place in two well-resolved stages. 相似文献
5.
Wanda Brzyska Zofia Rzączyńska Alina Kula 《Monatshefte für Chemie / Chemical Monthly》1989,120(3):211-217
Summary
p-Aminosalicylates of Y, La and lanthanides prepared in the reaction of the ammoniump-aminosalicylate and lanthanide chlorides in solutions have the general formulaLn(C7H6O3N)3·nH2O, wheren=3 for La, Ce;n=2 for Pr, Nd, Sm, Eu;n=0 for Y, Gd—Lu. Their solubilities in water are of the order of 10–3 mol dm–3. Heating above 350–450 K leads to dehydration and decomposition at the same time. The IR and X-ray spectra for the obtained complexes were recorded. It was found that only complexes of La—Nd are crystalline compounds. The way of metal-ligand coordination is discussed.
Darstellung und Charakterisierung der Komplexe von Seltenen Erdmetallen mitp-Aminosalicylsäure
Zusammenfassung Zur Darstellung der Verbindungen des TypsLn(C7H6O3N)3·nH2O (mitn=3 für La, Ce;n=2 für Pr, Nd, Sm, Eu;n=0 für Y, Gd—Lu) wurde die berechnete Menge von Ammonium-p-aminosalicylat undLnCl3-Lösungen beipH5.8 gemischt und zur Kristallisation gebracht. Ihre Wasserlöslichkeit bei 298 K ist in der Größenordnung 10–3 mol dm–3. Beim Erhitzen erfolgt bei 350–450 K Entwässerung und Zersetzung zugleich. Die Infrarot- und Röntgenspektren der erhaltenen Komplexe wurden gemessen und dabei festgestellt, daß nur die La—Nd-Komplexe kristalline Verbindungen sind. Die Art der Koordination der Seltenerdmetalle mit den Liganden wird diskutiert.相似文献
6.
Brzyska W. Tarnawska A. Twardowska A. Wiśniewska E 《Journal of Thermal Analysis and Calorimetry》2002,68(1):123-129
Y(III) and lanthanide(III) mesaconates were prepared as crystalline solids with general formula Ln2(C5H4O4)3⋅nH2O, where n=7 for La−Pr, n=4 for Y,Nd−Ho, n=8 for Er−Lu. IR spectra of the prepared mesaconates suggest that carboxylate groups are bidentate bridging anf chelating.
During heating the hydrated complexes are dehydrated in one (Y, Nd−Lu) or two steps (La−Pr) and then decompose directly to
oxides (Y, Ce, Pr, Sm, Gd−Lu) or with intermediate formation Ln2O2CO3 (La, Nd, Eu).
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
7.
Shiv K. Agarwal Dr. Jagdish P. Tandon 《Monatshefte für Chemie / Chemical Monthly》1977,108(1):175-179
Specific magnetic susceptibilities (s) of several newly synthesized chelates of some of the lanthanons [La(III), Pr(III) and Nd(III)] are reported. These derivatives are of the general type,Ln(O-i-C3H7)3–n
(C6H5CHNRO)
n
[where,Ln=La(III), Pr(III) or Nd(III);n=1 or 2 and R=CH2CH2, CH2CHCH3 or C6H4] and have been prepared by the reaction of the alkoxides of the lanthanons withSchiff bases such as benzylidene-2-hydroxyethylamine (C6H5CHNCH2CH2OH), benzylidene-2-hydroxy-n-propylamine (C6H5CHNCH2CHOHCH3) and benzylidene-o-aminophenol (C6H5CHNC6H4OH) in different molar relations in dry benzene.The resulting crystalline derivatives are non-volatile, light to deep yellow or blackish in colour. These tend to polymerize on keeping as shown by their insoluble nature and higher melting points, the polymerisation possibly occurring by the intermolecular coordination through oxygen atoms as reported earlier1.UsingGouy method2, the bis-isopropoxy mono-Schiff base and mono-isopropoxy bis-Schiff base complexes of La(III) have been shown to be diamagnetic, with s values being in the range of –0.32 to –0.45×10–6 and –0.39 to –0.55×10–6 c.g.s. units at 305 K respectively.In the remaining derivatives, Pr(O-i-C3H7)3–n
(C6H5CH NRO)
n
and Nd(O-i-C3H7)3–n
(C6H5CHNRO)
n
(where,n=1 or 2 and R=CH2CH2, CH2CHCH3 or C6H4) the magnetic moment values range between 3.25 to 3.32 and 3.30 to 3.33 B respectively indicating their paramagnetic nature. 相似文献
8.
Two novel inorganic-organic 3D network, namely{[Ln(L)1.5(H2O)2]·5H2O}n [Ln=Y (1), Ce (2)] [Ln(L)1.5(H2O)2]·5H2O [Ln=Y (1), Ce (2)], have been prepared through the assembly of the ligand 1,2-bis[3-(1,2,4-triazolyl)-4-amino-5-carboxylmethylthio]ethane (H2L) and lanthanide (III) salts under hydrothermal condition and structurally characterized by single-crystal X-ray diffractions. In complexes 1 and 2, the L2− anions adopt three different coordination fashions (bidentate chelate, bidentate bridging and bidentate chelate bridging) connecting Ln(III) ions via the oxygen atoms from carboxylate moieties. Both 1 and 2 exhibit 3D network structures with 2-fold interpenetration. Interestingly, the reversible desorption-adsorption behavior of lattice water is significantly observed in the two compounds. The result shows their potential application as late-model water absorbent in the field of adsorption material. 相似文献
9.
Double oxalates of rare earths(III) and rubidium with the general formulae RbCe(C2O4)2 4.5H2O, RbLn(C2O4)24H2O (Ln=Yb, Lu), RbLn(C2O4)2·3.5H2O (Ln=La, Pr-Dy), and RbLn(C2O4)2·3H2O (Ln=Ho, Er, Tm, Y) were synthesized. They were characterized by chemical analysis, TG, DTG and DSC over the temperature interval 20–500C and X-ray powder diffraction examination. At the chosen final temperature (500C), either oxide (Ln2O3) or basic carbonate Ln2O2CO3) and Rb2CO3 were obtained, depending on the rare earth(III) element. On the basis of the X-ray diffraction patterns, the isolated compounds can be divided into five isostructural groups. 相似文献
10.
W. Ferenc A. Dziewulska-Kułaczkowska J. Sarzyński B. Paszkowska 《Journal of Thermal Analysis and Calorimetry》2008,91(1):285-292
4-Chloro-2-methoxybenzoates of heavy lanthanides(III) and yttrium(III) were obtained as mono-, di-, tri-or tetrahydrates with
metal to ligand ratio of 1:3 and general formula Ln(C8H6ClO3)3·nH2O, where n=1 for Ln=Er, n=2 for Ln=Tb, Dy, Tm, Y, n=3 for Ln=Ho and n=4 for Yb and Lu. The complexes were characterized by elemental analysis, FTIR spectra, TG, DTA and DSC curves, X-ray diffraction
and magnetic measurements.
The carboxylate group appears to be a symmetrical bidentate chelating ligand. All complexes are polycrystalline compounds.
The values of enthalpy, ΔH, of the dehydration process for analysed complexes were also determined. The solubilities of heavy lanthanide(III) 4-chloro-2-methoxybenzoates
in water at 293 K are of the order of 10−4 mol dm−3. The magnetic moments were determined over the range of 76–303 K. The results indicate that there is no influence of the
ligand field of 4f electrons on lanthanide ions and the metal ligand bonding is mainly electrostatic in nature. 相似文献
11.
Summary Complexes of heavy lanthanide(III) (Gd-Lu) and Y(III) with 4-chlorophthalic acid were prepared and their IR spectra, solubility
in water at 295 K and thermal decomposition were investigated. When heated the complexes with general formula Ln2[ClC6H3(CO2)2]3·nH2O where n=6 for Tb, Dy(III), n=4 for Gd, Ho and Er(III), n=2 for Tm-Lu(III) and n=3 for Y(III) decompose to the oxides Ln2O3, Tb4O7 with intermediate formation of oxochlorides LnOCl. 相似文献
12.
O. E. Sherif Y. M. Issa M. E. M. Hassouna S. M. Abass 《Monatshefte für Chemie / Chemical Monthly》1993,124(6-7):627-635
Summary Solid complexes of 3-acetyl-1,5-diaryl and 3-cyano-1,5-diaryl formazans were prepared and characterized by elemental analysis, IR, NMR, TGA and DTA analyses. Based on these studies, the suggested general formula for the complexes is [M(HL)
m
(OH–)
n
or (NO
3
–
or Cl–)
x
·(H2O)
y
or (C2H5OH orDMSO)
z
, where HL=formazanM=Ce3+, Th4+, and UO
2
2+
,m=1–2,n=0–3,x=0–3,y=0–4 andz=0–3. The metal ions are expected to have coordination numbers 6–8.
Strukturuntersuchungen an 3-Acetyl-1,5-diaryl- und 3-Cyan-1,5-diaryl-formazan-Chelaten mit Cer(III), Thorium(IV) und Uran(VI)
Zusammenfassung Die hergestellten Chelate wurden mittels Elementaranalyse, IR, NMR, TGA und DTA charakterisiert. Darauf basierend wird die generelle Formel [M(HL) m (OH–) n bzw. (NO 3 – oder Cl–) x ·(H2O) y oder (C2H5OH bzw.DMSO) z ] vorgeschlagen, wobei HL=Formazan,M=Ce3+, Th4+ oder UO 2 2+ ,m=1–2,n=0–3,x=0–3,y=0–4 undz=0–3. Die Metallionen haben Koordinationszahlen von 6–8.相似文献
13.
Pavlíček Marek Trávníček Zdeněk Pastorek Richard Marek Jaromír 《Transition Metal Chemistry》2003,28(3):260-264
A series of square-planar nickel(II) hexamethylenedithiocarbamate complexes with heterogeneous coordination spheres of composition [NiX(hmidtc)Y] · nCHCl3 [X = Cl, Br, I or NCS; hmi = C6H12, dtc = S2CN–; Y = PPh3 or PBu3, n = 0,1] have been synthesized and characterized by elemental analyses, i.r. and u.v.–v.i.s. spectroscopy, magnetochemical and conductivity measurements, and by thermal analysis. X-ray structures of [NiCl(hmidtc)(PPh3)] · CHCl3 and [NiBr(hmidtc)(PPh3)] · CHCl3 have been determined. 相似文献
14.
Z. Rzączyńska M. Woźniak W. Wołodkiewicz A. Ostasz S. Pikus 《Journal of Thermal Analysis and Calorimetry》2007,88(3):871-876
The complexes of yttrium(III) and lanthanides(III) with 5-amino-1,3-benzenedicarboxylic acid form two isostructural series
of compounds and have the general formula Ln2(C8H5O4N)3·nH2O, where n = 13 for Y, La-Er and n=9 for Tm, Yb, Lu. They are insoluble in water and stable at room temperature. On heating in air or inert gas atmosphere they
lose all water molecules in several steps. The anhydrous compounds are stable to about 400°C and next decompose to oxides. 相似文献
15.
Conditions for the formation of rare earth element (Y, La–Lu) 3-methylglutarates were studied and their quantitative composition
and solubilities in water at 293 K were determined (10–2 mol dm–3). The IR spectra of the prepared complexes with general formula Ln2(C6H8O4)3
nH2O (n=3–8) were recorded and their thermal decomposition in the air were investigated. During heating the hydrated 3-methylglutarates
are dehydrated in one step and next anhydrous complexes decompose to oxides Ln2O3 with intermediate formation Ln2O2CO3 (Y, La, Nd–Gd) or directly to the oxides, Ln2O3, CeO2, Pr6O11 and Tb4O7 (Ce, Pr, Tb–Lu).
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
16.
Liu Jie Mei Wen-Jie Xu An-Wu Tan Cai-Ping Ji Liang-Nian 《Transition Metal Chemistry》2003,28(5):500-505
A series of novel heteropoly blues, Ln2H2[SiMo11Ni(H2O)O39] · nH2O (Ln = La, Ce, Pr, Nd, Sm, or Gd), had been prepared and characterized by elemental analysis, i.r., u.v., c.v., t.g.–d.t.a., XPS, 29Si-n.m.r., electrochemistry and magnetic susceptibility. Compared with non-reduced heteropolyoxometallates, the heteropoly blue anion in Ln2H2[SiMo11Ni(H2O)O39] · nH2O still retains the -Keggin structure but with a slight distortion, with Ni and Mo atoms distributed statistically in the crystal. The antiviral activities of these complexes have been studied using tomato mosaic virus. Ln2H2[SiMo11Ni(H2O)O39] · nH2O show excellent antivirus activities, and the cure rate reaches to 80–90%. 相似文献
17.
Csaba Várhelyi Magda Somay Antal Koch Ernő Grünwald 《Monatshefte für Chemie / Chemical Monthly》1978,109(6):1311-1320
Some new ligand exchange reactions of [Co(diph·H)2Cl(H2O)] and [Co(diph·H)2(SO3)(H2O)]– complexes with N3
–, S2O3
2– and with aromatic and heterocyclic amines were carried out. A series of derivatives of the types [Co(diph·H)2(SO3)X]
n–
(X=N3
–, S2O3
2– oramine) and [Co(diph·H)2(S2O3)2]3– were described and characterized. Some structural problems are resolved and discussed on the basis of UV and IR spectral data. 相似文献
18.
Brzyska W. Bartyzel A. Zieniewicz K. Zwolińska A. 《Journal of Thermal Analysis and Calorimetry》2000,63(2):493-500
Rare earth element 3-methyladipates were prepared as crystalline solids with general formula Ln2(C7H10O4)3⋅nH2O, where n=6 for La, n=4 for Ce,Sm–Lu, n=5 for Pr, Nd and n=5.5 for Y. Their solubilities in water at 293 K were determined (2⋅10–3–1.5⋅10–4 mol dm–3). The IR spectra of the prepared complexes suggest that the carboxylate groups are bidentate chelating. During heating the
hydrated 3-methyladipates lose all crystallization water molecules in one (Ce–Lu) or two steps (Y) (except of La(III) complex
which undergoes tomonohydrate) and then decompose directly to oxides (Y, Ce) or with intermediate formation of oxocarbonates
Ln2O2CO3 (Pr–Tb) or Ln2O(CO3)2 (Gd–Lu). Only La(III) complex decomposes in four steps forming additionally unstable La2(C7H10O4)(CO3)2.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
19.
Synthesis And Characterization Of Complexes Of Rare Earth Elements With 1,1-Cyclobutanedicarboxylic Acid 总被引:1,自引:0,他引:1
The complexes of yttrium and lanthanide with 1,1-cyclobutanedicarboxylic acid of the formula: Ln2(C6H6O4)3⋅nH2O, where n=4 for Y, Pr–Tm, n=5 for Yb,Lu, n=7 for La, Ce have been studied. The solid complexes have colours typical of Ln3+ ions. During heating in air they lose water molecules and then decompose to the oxides, directly (Y, Ce, Tm, Yb) or with
intermediate formation. The thermal decomposition is connected with released water (313–353 K), carbon dioxide, hydrocarbons(538–598
K) and carbon oxide for Ho and Lu. When heated in nitrogen they dehydrate to form anhydrous salt and next decompose to the
mixture of carbon and oxides of respective metals. IR spectra of the prepared complexes suggest that the carboxylate groups
are bidentate chelating.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
20.
3-Methoxy-4-methylbenzoates of Y(III) and lanthanide(III) (La-Lu) were prepared as crystalline compounds with molar ratio of metal to organic ligand of 1.0:3.0 and general formula Ln(C9H9O3)3·nH2O, where n=2 for Y, La-Er and n=0 for Tm-Lu. IR spectra of the prepared complexes suggest that carboxylate groups are bidentate chelating. During heating dihydrated complexes lose crystallization water molecules in one (Y, La, Pr-Er) or two steps (Ce) and then all the anhydrous complexes decompose directly to oxides Ln2O3, CeO2, Pr6O11 and Tb4O7.Vadim Mamleev is grateful to Region Nord-pas-de-Calais (France) for financial support and to laboratory PERF of ENSCL for its kind invitation to continue the joint work on thermal analysis. 相似文献