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研究了N-取代苯基氨基乙酸酮配合物的粉末及其二甲基甲酰胺溶液在77°K下的ESR谱,计算了各配合物的键参数,并对铜与配体间的键性质进行了讨论。 相似文献
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甲硫氨酸席夫碱铜、锌、钴配合物合成及抗O·-2性能 总被引:4,自引:0,他引:4
合成了邻香草醛甲硫氨酸席夫碱及其铜、锌、钴等配合物,通过元素分析,摩尔电导、红外光谱、电子光谱、热分析及电子顺磁共振等手段对它们进行了表征,并并用EPR法探讨了它们对O^.-2的清除作用,结果表明,配体与配合物均具有抗O^.-2性能,配合物清除能力比配体强,其中铜和钴配合物清除能力最强。 相似文献
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联苯甲酰-双-(缩氨基硫脲)及其Cu(Ⅱ)配合物的合成、光谱及磁性 总被引:10,自引:0,他引:10
合成了联苯甲酰-双-(缩氨基硫脲)及其二价负离子的铜配合物,对其进行了元素分析和电导、红外光谱、电子光谱、ESR谱以及变温磁化率的测定。配合物中的配位键具有极强的共价性,键参数α~2=0.64,未成对电子在配体氮原子上的自旋密度pN=0.114,配合物在低温下呈现反铁磁性,根据修正的二聚体磁化率公式得J=-2.88cm~(-1)。 相似文献
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以水杨醛半卡巴腙(H_2L)为配体合成了3种新型锰配合物:Mn(HL)_2·O.5H_2O、Mn(HL)L·1.5MeOH和Mn_3L_2(O_2CM_e)_4·3H_2O,并用元素分析、摩尔电导率、磁化率、红外光谱、紫外可见和ESR谱等对其组成和结构进行了研究和讨论。 相似文献
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phase diagrams of KCl-KBO2-K2CO3, K2MoO4-KBO2-K2CO3, and K2WO4-KBO2-K2CO3 ternary systems were studied by a calculation-experimental method and differential thermal analysis (DTA). The coordinates
of ternary eutectics were determined to be E
1: 622°C, 8.5 mol % KBO2, 56.5 mol % KCl, and 35 mol % K2CO3; E
2: 710°C, 23 mol % KBO2, 43 mol % K2CO3, and 34 mol % K2MoO4; E
3: 710°C, 23 mol % KBO2, 43 mol % K2CO3, and 34 mol % K2WO4. The specific heats of melting of the eutectics were determined. 相似文献
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K.V. Terebilenko V.N. Baumer N.S. Slobodyanik 《Journal of solid state chemistry》2008,181(9):2393-2400
The phase relations in the cross-section of the K2W2O7-K2WO4-KPO3 containing 15 mol% Bi2O3 were undertaken using flux method. Crystallization fields of K6.5Bi2.5W4P6O34, K2Bi(PO4)(WO4), Bi2WO6, KBi(WO4)2 and their cocrystallization areas were identified. Novel phase K6.5Bi2.5W4P6O34 was characterized by single-crystal X-ray diffraction: sp. gr. P−1, a=9.4170(5), b=9.7166(4), c=17.6050(7) Å, α=90.052(5)°, β=103.880(5)° and γ=90.125(5)°. It has a layered structure, which contains {K7Bi5W8P12O68}∞ layers stacked parallel to ab plane and sheets composed by potassium atoms separating these layers. Sandwich-like {K7Bi5W8P12O68}∞ layers are assembled from [W2P2O13]∞ and [BiPO4]∞ building units, and are penetrated by tunnels with K/Bi atoms inside. FTIR-spectra of K2Bi(PO4)(WO4) and K6.5Bi2.5W4P6O34 were discussed on the basis of factor group theory. 相似文献
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K3InF6 is synthesized by a sol-gel route starting from indium and potassium acetates dissolved in isopropanol in the stoichiometry 1:3, with trifluoroacetic acid as fluorinating agent. The crystal structures of the organic precursors were solved by X-ray diffraction methods on single crystals. Three organic compounds were isolated and identified: K2InC10O10H6F9, K3InC12O14H4F18 and K3InC12O12F18. The first one, deficient in potassium in comparison with the initial stoichiometry, is unstable. In its crystal structure, acetate as well as trifluoroacetate anions are coordinated to the indium atom. The two other precursors are obtained, respectively, by quick and slow evaporation of the solution. They correspond to the final organic compounds, which give K3InF6 by decomposition at high temperature. The crystal structure of K3InC12O14H4F18 is characterized by complex anions [In(CF3COO)4(OHx)2](5−2x)− and isolated [CF3COOH2−x](x−1)− molecules with x=2 or 1, surrounded by K+ cations. The crystal structure of K3InC12O12F18 is only constituted by complex anions [In(CF3COO)6]3− and K+ cations. For all these compounds, potassium cations ensure only the electroneutrality of the structure. IR spectra of K2InC10O10H6F9 and K3InC12O12F18 were also performed at room temperature on pulverized crystals. 相似文献
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S. F. Kudryashov O. S. Kudryashova L. P. Filippova 《Russian Journal of Inorganic Chemistry》2010,55(4):594-601
Solubility in the Na2Cr2O7-(NH4)2Cr2O7-K2Cr2O7-H2O four-component water-salt system at 25, 50, and 75°C was studied for the first time. Phase field boundaries for individual
salts and potassium and ammonium dichromate solid solutions, monovariant lines, and invariant points were determined. Experimental
data were used to optimize the looped isohydric process of potassium dichromate preparation involving additional salts. 相似文献
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Zh. A. Kochkarov M. V. Khubaeva I. A. Shogenov Z. L. Khakulov 《Russian Journal of Inorganic Chemistry》2011,56(6):946-953
The phase diagrams of the NaBO2-NaCl-Na2CO3, NaBO2-Na2CO3-Na2MoO4, NaBO2- Na2CO3-Na2WO4, and NaBO2-NaCl-Na2WO4 ternary systems were studied by a calculation-experimental method and differential thermal analysis. The coordinates of ternary
eutectics were determined: E
1: 612°C, 16 mol % NaBO2, 42 mol % NaCl, and 42 mol % Na2CO3; E
2: 568°C, 12 mol % NaBO2, 28 mol % Na2CO3, and 60 mol % Na2MoO4; E
3: 575°C, 12 mol % NaBO2, 32 mol % Na2CO3, and 56 mol % Na2WO4; E
4: 628°C, 8 mol % NaBO2, 20 mol % NaCl, and 72 mol % Na2WO4; and E
5: 655°C, 9 mol % NaBO2, 53 mol % NaCl, and 38 mol % Na2WO4. 相似文献
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本文用高精度数字式振荡管密度计测定了288K至318K温度范围内Li2SO4 + Na2SO4 + H2O和 Li2SO4 + K2SO4 + H2O三元体系的密度。混合溶液的离子强度范围从0.1到4.5 mol.kg–1,混合溶液中Na2SO4和K2SO4的离子强度分数为0.2,0.4,0.6和0.8。用密度实验值拟合得到了不同温度下Pitzer离子相互作用模型混合参数θV和 ψV,模型的计算值与实验值的偏差在±0.002 g.cm–3以内。用Pitzer模型计算了不同离子强度下三元体系的混合体积。 相似文献
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Two compounds of formula La7A3W4O30 (with A=Nb and Ta) were prepared by solid-state reaction at 1450 and 1490 °C. They crystallize in the rhombohedric space group R-3 (No. 148), with the hexagonal parameters: , and , . The structure of the materials was analyzed from X-ray, neutron and electronic diffraction. These oxides are isostructural of the reduced molybdenum compound La7Mo7O30, which are formed of perovskite rod along [111]. An order between (Nb, Ta) and W is observed. 相似文献
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M. M. Agaguseinova K. R. Gurbanov M. B. Adygezalova 《Russian Journal of Inorganic Chemistry》2011,56(8):1331-1334
SnSbBiS4-SnS and SnSbBiS4-Sn2Sb6S11 sections were studied by physicochemical methods (DTA, X-ray powder diffraction, microstructure observation, and microhardness
measurements). These sections were found to be eutectic quasi-binary sections of the SnS-Sb2S3-Bi2S3 ternary system. Solid solution regions based on the initial components were found on either side of the sections. Alloys
in the solid solution region are p-type semiconductors. 相似文献
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We have studied the preparation and crystallographic structure of three perovskite-type compounds: Sr3Cr2WO9, cubic, the lattice parameter of which is a = 7.812Å; Ca3Cr2WO9, tetragonal, the lattice parameters of which are a = 5.408 Å and c = 7.635Å; and Ba3Cr2WO9, hexagonal, the lattice parameters of which are a = 5.691 Å and c = 13.957Å. We have compared these three structures and shown the relationship between the dimensions of the alkaline-earth metal and the existence of the different structures. 相似文献
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O. P. Charkin N. M. Klimenko D. O. Charkin 《Russian Journal of Inorganic Chemistry》2008,53(4):568-578
The structural, electronic, and vibrational characteristics and energies of the isolated polyoxide clusters B20O30, Al20O30, V20O50, Si20O30H20, and Si20O30F20 and their complexes with the H− ion and ammonia complexes Al20O30 · nNH3 have been calculated by the density functional theory B3LYP method with different basis sets. The computation results show
that the symmetric closo structure I
h
with oxygen bridges located above the centers of the faces of an empty [M20] dodecahedron is more favorable for V20O50, Si20O30H20, and Si20O30F20. For B20O30, the cage closo isomer is also more favorable than the other isomers, but its structure is severely distorted as compared to a dodecahedron
and has a symmetry close to C
3
. For Al20O30, the I
h
structure corresponds to a high-lying local minimum of the potential energy surface. For Al20O30, a set of unusual puckshaped isomers of symmetry C
i
, with different numbers of four-coordinate atoms IVAl and three-coordinate atoms IIIO, was localized; these structures are more than 90 kcal/mol more favorable than the dodecahedron I
h
. The most favorable isomer of Al20O30 contains twelve four-coordinate atoms IVAl and four five-coordinate atoms VAl. The energies of dissociation of the most favorable M20O30 clusters into the M2O3 (C
2v
) and M4O6 (T
d
) fragments and, in the case of Al20O30, also into the Al8O12 (O
h
) and Al12O18 (D
3d
) fragments, have been estimated. The conclusion has been drawn that these clusters can, in principle, exist and can be experimentally
detected in the isolated state. Analogous calculations have been performed for ammonia complexes Al20O30 · nNH3 with n varying from 1 to 20. The effect of solvation on the relative stability of the dodecahedral and puckshaped isomers of the
Al20O30 cluster is observed. The isomers with ammonia molecules in their first coordination sphere become much closer to one another
on the energy scale; however, the dodecahedron remains a considerably less favorable intermediate.
Original Russian Text ? O.P. Charkin, N.M. Klimenko, D.O. Charkin, 2008, published in Zhurnal Neorganicheskoi Khimii, 2008,
Vol. 53, No. 4, pp. 624–635. 相似文献