The novel polyoxometalate, 32[Mo8ⅣMo4ⅤV2ⅣO38(PO4)], was synthesized and characterized by elementary analysis, EPR, IR spectra and X ray diffraction. The compoundcrystallizes in triclinic system, space group with a=...The novel polyoxometalate, 32[Mo8ⅣMo4ⅤV2ⅣO38(PO4)], was synthesized and characterized by elementary analysis, EPR, IR spectra and X ray diffraction. The compoundcrystallizes in triclinic system, space group with a= 1.41999(2)nm, b=1.43467(2)nm, c=1.694610(10)nm, α=95.7250(10)°, β=92.2110(10)°, γ=92.6060(10)°, V=3.42829(7)nm3, Z=2, Dc=2.388g·cm-3, Mr=2465.10g·mol-1, μ=2.489mm-1, F(000)=2388, R1=0.0584, wR2=0.1461, S=1.164. The heteropolyanion is a bi capped pseudo Keggin complex. CCDC: 186645.展开更多
A new pseudo Keggin-type bicapped compound（Et3N）0.5（en）2[SiMo12O40（VO）2]·4H2O（Et3N=triethylamine,en=ethylenediamine） has been hydrothermally synthesized and characterized by IR,elemental analysis,TG and X...A new pseudo Keggin-type bicapped compound（Et3N）0.5（en）2[SiMo12O40（VO）2]·4H2O（Et3N=triethylamine,en=ethylenediamine） has been hydrothermally synthesized and characterized by IR,elemental analysis,TG and X-ray crystallography.The title compound crystallizes in monoclinic,space group P21/n with a=17.576（2）,b=13.535（1）,c=21.587（2）,β=103.790（10）°,V=4987.3（8）3,Z=4,Dc=2.925 Mg/m3,Mr=2196.12,F（000）=4148,μ=3.400 mm–1,R=0.0379 and wR=0.1219.The most remarkable structural feature of the compound is that the clusters represent bicapped pseudo-Keggin structure and are linked one by one through V-O-V bonds forming an infinite 1D chain. Furthermore, such chains are interconnected in a cross-like arrangement through multiform hydrogen bonds to yield a 3D supramolecular network.展开更多
A new vanadylpolymolybdophosphate, [H 2N(C 2H 4) 2NH 2] 4-(H 3O)[PMo V 2Mo VI 6V IV 4O 40(V IVO) 2]·H 2O, was hydrothermally synthesized and structurally characterized by elemental ana...A new vanadylpolymolybdophosphate, [H 2N(C 2H 4) 2NH 2] 4-(H 3O)[PMo V 2Mo VI 6V IV 4O 40(V IVO) 2]·H 2O, was hydrothermally synthesized and structurally characterized by elemental analyses, IR, UV-vis, XPS, ESR spectra, and single crystal X-ray diffraction analysis. The compound contains an unusual highly reduced pseudo-Keggin type polyoxoanion with nine negative charges and exhibits an interesting phosphorus-centered alternate layer arrangement of molybdenum and vanadium oxides.展开更多
The title compound[Co(2,2-bipy) 3] 4[Mo 10V 6O 40(PO 4)] 2·4H 2O was synthesized by hydrothermal method and its structure was determined with single crystal X-ray analysis. The cluster anion is double tetracapped...The title compound[Co(2,2-bipy) 3] 4[Mo 10V 6O 40(PO 4)] 2·4H 2O was synthesized by hydrothermal method and its structure was determined with single crystal X-ray analysis. The cluster anion is double tetracapped Pseudo-Keggin cluster anions. The crystal is triclinic, space group P-1 with a=\{1\^316 5(3)\} nm, b=1\^438 2(3) nm, c=2\^764 4(6) nm, α=79\^51°, β=89\^95°, γ=68\^89°, V=\{4\^789 3(17)\} nm 3, Z=1, D c=2\^176 g/cm 3, R=0\^075 5, wR=0\^205 3, S=0\^995.展开更多
A novel polyoxometalate [H3O][PMo5^ⅥMo7^ⅤO40 （V^ⅣO）4]·6Py （Py = pyridine） was synthesized and characterized by IR spectrometry, TG and single-crystal X-ray diffraction. The title compound crystallizes in t...A novel polyoxometalate [H3O][PMo5^ⅥMo7^ⅤO40 （V^ⅣO）4]·6Py （Py = pyridine） was synthesized and characterized by IR spectrometry, TG and single-crystal X-ray diffraction. The title compound crystallizes in the monoclinic space group（C2/m） with α=1.3680（3） nm, b=2.1740（4） nm, c=1.1630（2） nm, β= 118.62（3）°, V= 3. 0362 （10） nm^3, Z = 2, and Rt （wR2） = 0. 0772 （0. 2312）. The compound contains a highly reduced vanadylpoly-molybdophosphate polyoxometalate anion with a four-capped structure. The four {VO} units cap four opposite pits of the pseudo-Keggin core {PMo12O40}.展开更多
A novel compound [H_2Mo_ 5.5V_ 10.5O_ 40(PO_4)][Cu(en)_2]_4·7H_2O(1) was synthesized from V_2O_5, MoO_3, CuCl_2·2H_2O, en, H_3PO4 and H_2O in an aqueous solution via the hydrothermal method and characteri...A novel compound [H_2Mo_ 5.5V_ 10.5O_ 40(PO_4)][Cu(en)_2]_4·7H_2O(1) was synthesized from V_2O_5, MoO_3, CuCl_2·2H_2O, en, H_3PO4 and H_2O in an aqueous solution via the hydrothermal method and characterized by means of single-crystal X-ray diffraction, elemental analyses, IR, EPR spectra and thermal analyses. C_ 16H_ 80Cu_4Mo_ 5.5N_ 16O_ 51PV_ 10.5 crystallized in a triclinic system, the space group is P1 with M=2660.63, a= 1.283590(10) nm, b=1.289910(10) nm, c=1.387870(10) nm, V=1.80942(2) nm 3, Z=2, D_x=4.883 g/cm 3, F(000)=2599, μ=6.956 mm -1, (Δ/σ)=0.000, S=1.089. The crystal structure was solved by the direct methods with the final R=0.0752 and wR=0.1988 for 6311 observed reflections with I≥2σ(I). The X-ray crystallography reveals that compound 1 is a novel two-dimensional framework material constructed from the mixed Mo/V polyoxometalate and coordination groups.展开更多
A kinetic study of the electron-transfer in the reaction of tribenzylchlorotin with potassium 12-tungsto cobalt （Ⅲ） ate ion, Ks[CoW12O40], abbreviated as Co（III）W, has been performed in different solvents. The st...A kinetic study of the electron-transfer in the reaction of tribenzylchlorotin with potassium 12-tungsto cobalt （Ⅲ） ate ion, Ks[CoW12O40], abbreviated as Co（III）W, has been performed in different solvents. The studies were carried out in methanol, ethanol, acetonitrile and acetic acid/water. The rate constants, reaction rates and activation parameters were calculated. Our findings show that the rate of disappearance of the Co（Ⅲ） is pseudo-first order. The kinetic data is strongly affected by used solvents. The maximum and minimum rate constants were achieved in the ethanol and acetic acid/water （70/30） as a solvent, respectively. In all of the used solvents, negative value of activation entropies was observed, but negative activation enthalpies are observed in methanol, ethanol and acetonitrile. The reaction rate is increased with increase of Co（Ⅲ） concentration. ？2009 Fatemeh E Bamoharram. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.展开更多
文摘The novel polyoxometalate, 32[Mo8ⅣMo4ⅤV2ⅣO38(PO4)], was synthesized and characterized by elementary analysis, EPR, IR spectra and X ray diffraction. The compoundcrystallizes in triclinic system, space group with a= 1.41999(2)nm, b=1.43467(2)nm, c=1.694610(10)nm, α=95.7250(10)°, β=92.2110(10)°, γ=92.6060(10)°, V=3.42829(7)nm3, Z=2, Dc=2.388g·cm-3, Mr=2465.10g·mol-1, μ=2.489mm-1, F(000)=2388, R1=0.0584, wR2=0.1461, S=1.164. The heteropolyanion is a bi capped pseudo Keggin complex. CCDC: 186645.
基金supported by the National Natural Science Foundation of China (No 20701012)the Key Project of Chinese Ministry of Education (No 207068)+1 种基金the Foundation of Henan Educational Committee of China (No 2007150003 and 2008B150002)the Foundation for University Youth Key Teacher of Henan Province
文摘A new pseudo Keggin-type bicapped compound（Et3N）0.5（en）2[SiMo12O40（VO）2]·4H2O（Et3N=triethylamine,en=ethylenediamine） has been hydrothermally synthesized and characterized by IR,elemental analysis,TG and X-ray crystallography.The title compound crystallizes in monoclinic,space group P21/n with a=17.576（2）,b=13.535（1）,c=21.587（2）,β=103.790（10）°,V=4987.3（8）3,Z=4,Dc=2.925 Mg/m3,Mr=2196.12,F（000）=4148,μ=3.400 mm–1,R=0.0379 and wR=0.1219.The most remarkable structural feature of the compound is that the clusters represent bicapped pseudo-Keggin structure and are linked one by one through V-O-V bonds forming an infinite 1D chain. Furthermore, such chains are interconnected in a cross-like arrangement through multiform hydrogen bonds to yield a 3D supramolecular network.
文摘A new vanadylpolymolybdophosphate, [H 2N(C 2H 4) 2NH 2] 4-(H 3O)[PMo V 2Mo VI 6V IV 4O 40(V IVO) 2]·H 2O, was hydrothermally synthesized and structurally characterized by elemental analyses, IR, UV-vis, XPS, ESR spectra, and single crystal X-ray diffraction analysis. The compound contains an unusual highly reduced pseudo-Keggin type polyoxoanion with nine negative charges and exhibits an interesting phosphorus-centered alternate layer arrangement of molybdenum and vanadium oxides.
文摘The title compound[Co(2,2-bipy) 3] 4[Mo 10V 6O 40(PO 4)] 2·4H 2O was synthesized by hydrothermal method and its structure was determined with single crystal X-ray analysis. The cluster anion is double tetracapped Pseudo-Keggin cluster anions. The crystal is triclinic, space group P-1 with a=\{1\^316 5(3)\} nm, b=1\^438 2(3) nm, c=2\^764 4(6) nm, α=79\^51°, β=89\^95°, γ=68\^89°, V=\{4\^789 3(17)\} nm 3, Z=1, D c=2\^176 g/cm 3, R=0\^075 5, wR=0\^205 3, S=0\^995.
文摘A novel polyoxometalate [H3O][PMo5^ⅥMo7^ⅤO40 （V^ⅣO）4]·6Py （Py = pyridine） was synthesized and characterized by IR spectrometry, TG and single-crystal X-ray diffraction. The title compound crystallizes in the monoclinic space group（C2/m） with α=1.3680（3） nm, b=2.1740（4） nm, c=1.1630（2） nm, β= 118.62（3）°, V= 3. 0362 （10） nm^3, Z = 2, and Rt （wR2） = 0. 0772 （0. 2312）. The compound contains a highly reduced vanadylpoly-molybdophosphate polyoxometalate anion with a four-capped structure. The four {VO} units cap four opposite pits of the pseudo-Keggin core {PMo12O40}.
文摘A novel compound [H_2Mo_ 5.5V_ 10.5O_ 40(PO_4)][Cu(en)_2]_4·7H_2O(1) was synthesized from V_2O_5, MoO_3, CuCl_2·2H_2O, en, H_3PO4 and H_2O in an aqueous solution via the hydrothermal method and characterized by means of single-crystal X-ray diffraction, elemental analyses, IR, EPR spectra and thermal analyses. C_ 16H_ 80Cu_4Mo_ 5.5N_ 16O_ 51PV_ 10.5 crystallized in a triclinic system, the space group is P1 with M=2660.63, a= 1.283590(10) nm, b=1.289910(10) nm, c=1.387870(10) nm, V=1.80942(2) nm 3, Z=2, D_x=4.883 g/cm 3, F(000)=2599, μ=6.956 mm -1, (Δ/σ)=0.000, S=1.089. The crystal structure was solved by the direct methods with the final R=0.0752 and wR=0.1988 for 6311 observed reflections with I≥2σ(I). The X-ray crystallography reveals that compound 1 is a novel two-dimensional framework material constructed from the mixed Mo/V polyoxometalate and coordination groups.
文摘A kinetic study of the electron-transfer in the reaction of tribenzylchlorotin with potassium 12-tungsto cobalt （Ⅲ） ate ion, Ks[CoW12O40], abbreviated as Co（III）W, has been performed in different solvents. The studies were carried out in methanol, ethanol, acetonitrile and acetic acid/water. The rate constants, reaction rates and activation parameters were calculated. Our findings show that the rate of disappearance of the Co（Ⅲ） is pseudo-first order. The kinetic data is strongly affected by used solvents. The maximum and minimum rate constants were achieved in the ethanol and acetic acid/water （70/30） as a solvent, respectively. In all of the used solvents, negative value of activation entropies was observed, but negative activation enthalpies are observed in methanol, ethanol and acetonitrile. The reaction rate is increased with increase of Co（Ⅲ） concentration. ？2009 Fatemeh E Bamoharram. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
