The crystal structure of the title compound, [enH2][Fe{MoⅤ6O12(OH)3(HPO4)- (H2PO4)3}2]6en6H2O (en = H2NCH2CH2NH2), hydrothermally synthesized from a mixture of Na2MoO42H2O, Fe2(SO4)3, H3PO4, H2N(CH2)2NH2 and water, h...The crystal structure of the title compound, [enH2][Fe{MoⅤ6O12(OH)3(HPO4)- (H2PO4)3}2]6en6H2O (en = H2NCH2CH2NH2), hydrothermally synthesized from a mixture of Na2MoO42H2O, Fe2(SO4)3, H3PO4, H2N(CH2)2NH2 and water, has been determined by single- crystal X-ray diffraction. The crystal is of triclinic, space group P?with a = 11.9014(1), b = 13.4246(2), c = 13.8719(2) , a = 87.465(1), b = 69.981(1), g = 64.960(1)? V = 1873.46(4) 3, Z = 1, Mr = 2997.89, F(000) = 1466, m = 2.427 mm-1 and Dc = 2.657 g/cm3. The final R = 0.0404 for 5570 observed reflections (I > 2s(I)). The structural analysis reveals that each cluster anion contains two coplanar {Mo6} rings of six edge-sharing Mo(O5OH) octahedra, and the two {Mo6} rings are linked together through one octahedral FeⅡ ion to generate a sandwich-type cluster with rigorous () symmetry. Moreover, these clusters are further linked into a three-dimensional frame- work by hydrogen bonds.展开更多
Two crystals, [Sm（Hcpna）（cpna）·3 H2O]n（1） and [Eu（Hcpna）（cpna）·2 H2O]n（2）,have been synthesized by solvothermal method based on Sm3+ and Eu3+ with multiple acid ligands5-（4-carboxyphenoxy）nicot...Two crystals, [Sm（Hcpna）（cpna）·3 H2O]n（1） and [Eu（Hcpna）（cpna）·2 H2O]n（2）,have been synthesized by solvothermal method based on Sm3+ and Eu3+ with multiple acid ligands5-（4-carboxyphenoxy）nicotinic acid（H2cpna）, and the new complexes have been characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy, thermogravimetric analysis and fluorescence analysis. Complex 1 exhibits a 1 D chain structure. It crystallizes in the triclinic system, space group P1 with a = 5.9738（11）, b = 12.528（2）, c = 18.021（4） ?, α = 93.156（3）o, β =98.067（3）o, γ = 92.692（3）o, V = 1331.3（4） ?3, Z = 2, S = 1.069, F（000） = 702, R = 0.0277 and wR =0.0688（I > 2σ（I））. Complex 2 shows a two-dimensional network structure, which crystallizes in monoclinic system, space group C2/c with a = 13.6733（19）, b = 18.422（3）, c = 10.4307（15） ?, β =93.881（2）o, V= 2621.4（7） ?3, Z = 4, S = 1.110, F（000） = 1372, R = 0.0302 and wR = 0.0811（I >2σ（I））. The solid-state fluorescent test results show tcomplex 1 has weaker fluorescence intensity than the ligand. However, complex 2 has excellent fluorescence properties, and can emit bright red light under the irradiation of ultraviolet lamp.展开更多
etra ( N, N-diethyldithiocarbamates ) Samarium (Ⅲ)tetra (N, N-di-ethyldithiocarbamates) Molybdenum (V)([Mo (dtc)][Sm (dtc)])was synthesizedby the reaction of [Mo(dtc)]Cl and Na[Sm(dtc)] in miethanol. The crystal stru...etra ( N, N-diethyldithiocarbamates ) Samarium (Ⅲ)tetra (N, N-di-ethyldithiocarbamates) Molybdenum (V)([Mo (dtc)][Sm (dtc)])was synthesizedby the reaction of [Mo(dtc)]Cl and Na[Sm(dtc)] in miethanol. The crystal struc-ture was determined using X-ray diffraction methods. The compound crystallizes inthe triclinic space group P1 with the lattice parameters: a =1. 1557(4) nm, b=1.5253(3) nm, c=1. 8670 (6) nm and a=97.001 (20)°, β=94. 506(24)°, γ=93. 419(20)°,Z=2.The final R=0.059.The spectroscopic and XPS studies werecarried out.展开更多
Advantages of the detached phenomena have influenced researchers to modify the conventional methods to promote it on the earth. Since 1994, the vertical directional solidification （VDS） technique has been employed f...Advantages of the detached phenomena have influenced researchers to modify the conventional methods to promote it on the earth. Since 1994, the vertical directional solidification （VDS） technique has been employed for the growth of bulk crystals, without the seed, without contact to the ampoule wall, without coating and without external pressure. An automated furnace was designed and fabricated for the controlled temperature gradients, growth conditions and parameters. The typical ingots growths of GaSb have shown the gap of 20 μm-145 μm and mobility μn = 1125 cm^2/V.sec at 300 K. Mobility is highest and five times larger than the attached growths. Dislocation density is the order of 104/cm2 in the conical region, decreases in the direction of growth, and in many crystals reached less than 103/cm2. The spontaneous gap formation due to the meniscus depends on the pressure differences and thermal state. GaSb grown ingots have shown progress in the properties of crystal grown ever, and attributed to reduce thermal stress without contact to the ampoule wall.展开更多
基金This work was supported by the State Key Laboratory of Structural Chemistry (030065) the Chinese Academy of Sciences the NNSFC (20073048) and the NSF of Fujian province (2002F015)
文摘The crystal structure of the title compound, [enH2][Fe{MoⅤ6O12(OH)3(HPO4)- (H2PO4)3}2]6en6H2O (en = H2NCH2CH2NH2), hydrothermally synthesized from a mixture of Na2MoO42H2O, Fe2(SO4)3, H3PO4, H2N(CH2)2NH2 and water, has been determined by single- crystal X-ray diffraction. The crystal is of triclinic, space group P?with a = 11.9014(1), b = 13.4246(2), c = 13.8719(2) , a = 87.465(1), b = 69.981(1), g = 64.960(1)? V = 1873.46(4) 3, Z = 1, Mr = 2997.89, F(000) = 1466, m = 2.427 mm-1 and Dc = 2.657 g/cm3. The final R = 0.0404 for 5570 observed reflections (I > 2s(I)). The structural analysis reveals that each cluster anion contains two coplanar {Mo6} rings of six edge-sharing Mo(O5OH) octahedra, and the two {Mo6} rings are linked together through one octahedral FeⅡ ion to generate a sandwich-type cluster with rigorous () symmetry. Moreover, these clusters are further linked into a three-dimensional frame- work by hydrogen bonds.
基金supported by NSFC(U1504531)University Key Scientific Research Project of Henan Province(19B150014)
文摘Two crystals, [Sm（Hcpna）（cpna）·3 H2O]n（1） and [Eu（Hcpna）（cpna）·2 H2O]n（2）,have been synthesized by solvothermal method based on Sm3+ and Eu3+ with multiple acid ligands5-（4-carboxyphenoxy）nicotinic acid（H2cpna）, and the new complexes have been characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy, thermogravimetric analysis and fluorescence analysis. Complex 1 exhibits a 1 D chain structure. It crystallizes in the triclinic system, space group P1 with a = 5.9738（11）, b = 12.528（2）, c = 18.021（4） ?, α = 93.156（3）o, β =98.067（3）o, γ = 92.692（3）o, V = 1331.3（4） ?3, Z = 2, S = 1.069, F（000） = 702, R = 0.0277 and wR =0.0688（I > 2σ（I））. Complex 2 shows a two-dimensional network structure, which crystallizes in monoclinic system, space group C2/c with a = 13.6733（19）, b = 18.422（3）, c = 10.4307（15） ?, β =93.881（2）o, V= 2621.4（7） ?3, Z = 4, S = 1.110, F（000） = 1372, R = 0.0302 and wR = 0.0811（I >2σ（I））. The solid-state fluorescent test results show tcomplex 1 has weaker fluorescence intensity than the ligand. However, complex 2 has excellent fluorescence properties, and can emit bright red light under the irradiation of ultraviolet lamp.
文摘etra ( N, N-diethyldithiocarbamates ) Samarium (Ⅲ)tetra (N, N-di-ethyldithiocarbamates) Molybdenum (V)([Mo (dtc)][Sm (dtc)])was synthesizedby the reaction of [Mo(dtc)]Cl and Na[Sm(dtc)] in miethanol. The crystal struc-ture was determined using X-ray diffraction methods. The compound crystallizes inthe triclinic space group P1 with the lattice parameters: a =1. 1557(4) nm, b=1.5253(3) nm, c=1. 8670 (6) nm and a=97.001 (20)°, β=94. 506(24)°, γ=93. 419(20)°,Z=2.The final R=0.059.The spectroscopic and XPS studies werecarried out.
文摘Advantages of the detached phenomena have influenced researchers to modify the conventional methods to promote it on the earth. Since 1994, the vertical directional solidification （VDS） technique has been employed for the growth of bulk crystals, without the seed, without contact to the ampoule wall, without coating and without external pressure. An automated furnace was designed and fabricated for the controlled temperature gradients, growth conditions and parameters. The typical ingots growths of GaSb have shown the gap of 20 μm-145 μm and mobility μn = 1125 cm^2/V.sec at 300 K. Mobility is highest and five times larger than the attached growths. Dislocation density is the order of 104/cm2 in the conical region, decreases in the direction of growth, and in many crystals reached less than 103/cm2. The spontaneous gap formation due to the meniscus depends on the pressure differences and thermal state. GaSb grown ingots have shown progress in the properties of crystal grown ever, and attributed to reduce thermal stress without contact to the ampoule wall.
