A new polyoxometalate dimer based on lacunary Wells-Dawson anion and lanthanide cation, Na14[{Nd(H2O)3 (α2-PeWt7O61)2]·17H2O, was isolated as a sodium salt under ambient conditions and characterized by IR, T...A new polyoxometalate dimer based on lacunary Wells-Dawson anion and lanthanide cation, Na14[{Nd(H2O)3 (α2-PeWt7O61)2]·17H2O, was isolated as a sodium salt under ambient conditions and characterized by IR, TG, and X-ray single crystal structure analysis and electrochemistry. It belonged to the triclinic, space group Pi with a=1.26738 (15) nm, b=1.41464 (17) nm, c=2.3254 (4) nm, α=103.142 (2)°, β = 95.122 (2)°, γ=113.9690 (10)°, V=3.6317 (8)nm^3, Z=2, Dc=4.274 mg/m^3, and μ=27.695 mm^-1. The Nd^3+ ion was substituted for a [W=O]^4+ unit in the "cap" site of the tungsten-oxygen framework of the parent Wells-Dawson ion. The cyclic voltammograms of the title compound exhibited nearly chemically reversible one-step one-electron transfer process and two-step irreversible reduction processes. Thermogravimetric showed a one-step slow weight loss stage in the range of 25-850 ℃.展开更多
An unprecedented 1D zigzag chain alkaline earth metal derivative, {[Ba(DMF)3 (H20)2][Ba(DMF)412(P2W18O62)}n, (DMF=N, N-dimethyl formamide) containing Dawson hetero- polyanion has been successfully synthesize...An unprecedented 1D zigzag chain alkaline earth metal derivative, {[Ba(DMF)3 (H20)2][Ba(DMF)412(P2W18O62)}n, (DMF=N, N-dimethyl formamide) containing Dawson hetero- polyanion has been successfully synthesized and characterized by X-ray crystallography. Two barium cations bridged by three DMF ligands in parallel combination with the Dawson-type heteropolyanion [P2W18O62]^6- and then the resulting subunits {[Ba(DMF)4]2(P2WlsO62)}^2+ are alternately linked together via another [Ba(DMF)3(H2O)2]^2+ ions, constructing a 1D zigzag chain architecture.展开更多
Two novel zeotype crystals, K4[Cr30(H2O) 3(OOCH) 6] 2[ P2W18O62]· 9.5H2 O and K4[ Cr3O( H2O)3( OOCH)6 ]2[ H3 P2 W17Co(H2O) O61]· 20H2O(2) , were synthesized and their structures were determined ...Two novel zeotype crystals, K4[Cr30(H2O) 3(OOCH) 6] 2[ P2W18O62]· 9.5H2 O and K4[ Cr3O( H2O)3( OOCH)6 ]2[ H3 P2 W17Co(H2O) O61]· 20H2O(2) , were synthesized and their structures were determined using X-ray single crystal diffraction. Crystal data: C12H43O103.5K4Cr6P2W18(1), hexagonal P6(3)/m, α= 1. 5895(2) nm, b=1.5895(2) nm, c =2.1620(4) nm, α=90°, β=90°, γ= 120°, V=4.7305(13) nm^3, Z=2, R1 =0,0726, ωR2 =0. 1542; C6H57O98K4Cr3CoP2W17 (2), hexagonal P6(3)/mmc, α = 1.61328(3) nm, b = 1.61328(3) nm, c=2.06613(9) nm, α=90°, β=90°, γ=120°, V=4.6570(2) nm^3, Z=2, R1 =0.0377, ωR2 =0. 1070. These crystals were characterized using elemental analysis, IR, TG-DTA, and XRD. It was found that the polyoxometalate anions maintained Wells-Dawson structure for crystal I and laeunary Wens-Dawson structure for crystal 2. Thermal analysis showed that crystal 1 lost the water of crystallization at 132 ℃, whereas crystal 2 lost the water of crystallization at 100 ℃. Crystal 1 could reversibly desorb and adsorb water molecules and its crystal structure could be restored after re-adsorbing the water molecules. It was also found from the XRD patterns that the void size of crystal 2 is smaller compared with that of crystal 1, which is attributed to the higher anion charges.展开更多
Eleven heteropolytungstophosphate compounds with lanthanon having Dawson structure were prepared, Ln_2[P_2W_(18)O_(62)]·xH_2O(Ln=La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Yb).Their structures were studied by IR,UV,polarograp...Eleven heteropolytungstophosphate compounds with lanthanon having Dawson structure were prepared, Ln_2[P_2W_(18)O_(62)]·xH_2O(Ln=La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Yb).Their structures were studied by IR,UV,polarography ,X-ray diffraction and X-ray photoelectron spectroscopy.展开更多
The present paper covers a salt of 2:18 heteropoly complex of tungstotitanophosphate prepared with the method of improved sequence preparation. The title compound was characterized by elemental analysis, 31P NMR spect...The present paper covers a salt of 2:18 heteropoly complex of tungstotitanophosphate prepared with the method of improved sequence preparation. The title compound was characterized by elemental analysis, 31P NMR spectra, polarography, cyclic voltammetry, IR, UV, X-ray powder diffraction , X-ray photoelectron spectra and TG-DTA analysis. The results show that the complex with the formula K8[TiP2W17O62]·12H2O has Dawson structure. Its properties such as spectra, redox behavior and thermal stability are discussed.展开更多
A series of lanthanide complexes.K17 [Ln (As2W17O61)2].rH2O (Ln=La, Pr,Nd, Sm, Eu,.Gd or Dy) have been prepared and characterized by elemental analysis,IR.183W NMR and electrochemistry.
Tetrabutylammonium or potassium salts of organometalllic derivatives of lacunary polyanion (RM) 3P 2W 15 O n- 59 (RM=CpTi, CpZr, C 4H 7O 2Sn or C 5H 9O 2Sn) have been prepared and structurally...Tetrabutylammonium or potassium salts of organometalllic derivatives of lacunary polyanion (RM) 3P 2W 15 O n- 59 (RM=CpTi, CpZr, C 4H 7O 2Sn or C 5H 9O 2Sn) have been prepared and structurally characterized by elemental analysis, IR, UV vis, 1H NMR and 183 W NMR spectroscopies. The title complexes exhibit antitumor activity in vitro.展开更多
基金the Nature Science Foundation of Henan Province (0611011900)
文摘A new polyoxometalate dimer based on lacunary Wells-Dawson anion and lanthanide cation, Na14[{Nd(H2O)3 (α2-PeWt7O61)2]·17H2O, was isolated as a sodium salt under ambient conditions and characterized by IR, TG, and X-ray single crystal structure analysis and electrochemistry. It belonged to the triclinic, space group Pi with a=1.26738 (15) nm, b=1.41464 (17) nm, c=2.3254 (4) nm, α=103.142 (2)°, β = 95.122 (2)°, γ=113.9690 (10)°, V=3.6317 (8)nm^3, Z=2, Dc=4.274 mg/m^3, and μ=27.695 mm^-1. The Nd^3+ ion was substituted for a [W=O]^4+ unit in the "cap" site of the tungsten-oxygen framework of the parent Wells-Dawson ion. The cyclic voltammograms of the title compound exhibited nearly chemically reversible one-step one-electron transfer process and two-step irreversible reduction processes. Thermogravimetric showed a one-step slow weight loss stage in the range of 25-850 ℃.
文摘An unprecedented 1D zigzag chain alkaline earth metal derivative, {[Ba(DMF)3 (H20)2][Ba(DMF)412(P2W18O62)}n, (DMF=N, N-dimethyl formamide) containing Dawson hetero- polyanion has been successfully synthesized and characterized by X-ray crystallography. Two barium cations bridged by three DMF ligands in parallel combination with the Dawson-type heteropolyanion [P2W18O62]^6- and then the resulting subunits {[Ba(DMF)4]2(P2WlsO62)}^2+ are alternately linked together via another [Ba(DMF)3(H2O)2]^2+ ions, constructing a 1D zigzag chain architecture.
基金Supported by the Dalian Municipal Science and Technology Commission and Liaoning Provincial Science and Technology Com-mission(No. 20031059)
文摘Two novel zeotype crystals, K4[Cr30(H2O) 3(OOCH) 6] 2[ P2W18O62]· 9.5H2 O and K4[ Cr3O( H2O)3( OOCH)6 ]2[ H3 P2 W17Co(H2O) O61]· 20H2O(2) , were synthesized and their structures were determined using X-ray single crystal diffraction. Crystal data: C12H43O103.5K4Cr6P2W18(1), hexagonal P6(3)/m, α= 1. 5895(2) nm, b=1.5895(2) nm, c =2.1620(4) nm, α=90°, β=90°, γ= 120°, V=4.7305(13) nm^3, Z=2, R1 =0,0726, ωR2 =0. 1542; C6H57O98K4Cr3CoP2W17 (2), hexagonal P6(3)/mmc, α = 1.61328(3) nm, b = 1.61328(3) nm, c=2.06613(9) nm, α=90°, β=90°, γ=120°, V=4.6570(2) nm^3, Z=2, R1 =0.0377, ωR2 =0. 1070. These crystals were characterized using elemental analysis, IR, TG-DTA, and XRD. It was found that the polyoxometalate anions maintained Wells-Dawson structure for crystal I and laeunary Wens-Dawson structure for crystal 2. Thermal analysis showed that crystal 1 lost the water of crystallization at 132 ℃, whereas crystal 2 lost the water of crystallization at 100 ℃. Crystal 1 could reversibly desorb and adsorb water molecules and its crystal structure could be restored after re-adsorbing the water molecules. It was also found from the XRD patterns that the void size of crystal 2 is smaller compared with that of crystal 1, which is attributed to the higher anion charges.
文摘Eleven heteropolytungstophosphate compounds with lanthanon having Dawson structure were prepared, Ln_2[P_2W_(18)O_(62)]·xH_2O(Ln=La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Yb).Their structures were studied by IR,UV,polarography ,X-ray diffraction and X-ray photoelectron spectroscopy.
文摘The present paper covers a salt of 2:18 heteropoly complex of tungstotitanophosphate prepared with the method of improved sequence preparation. The title compound was characterized by elemental analysis, 31P NMR spectra, polarography, cyclic voltammetry, IR, UV, X-ray powder diffraction , X-ray photoelectron spectra and TG-DTA analysis. The results show that the complex with the formula K8[TiP2W17O62]·12H2O has Dawson structure. Its properties such as spectra, redox behavior and thermal stability are discussed.
文摘A series of lanthanide complexes.K17 [Ln (As2W17O61)2].rH2O (Ln=La, Pr,Nd, Sm, Eu,.Gd or Dy) have been prepared and characterized by elemental analysis,IR.183W NMR and electrochemistry.
基金theNationalNaturalScienceFoundationofChina (No .2 0 1710 11)
文摘Tetrabutylammonium or potassium salts of organometalllic derivatives of lacunary polyanion (RM) 3P 2W 15 O n- 59 (RM=CpTi, CpZr, C 4H 7O 2Sn or C 5H 9O 2Sn) have been prepared and structurally characterized by elemental analysis, IR, UV vis, 1H NMR and 183 W NMR spectroscopies. The title complexes exhibit antitumor activity in vitro.