排序方式: 共有12条查询结果,搜索用时 21 毫秒
1.
《Physics and Chemistry of Liquids》2012,50(1):85-97
Abstract Viscosities of the systems, water (W) + n-butylamine (NBA), W + sec-butylamine (SBA) and W + tert-butylamine (TBA) have been measured in the temperature range 298.15–323.15K. The viscosities (η) and excess viscosities (ηE) have been plotted against mole fraction of amines (X 2). On addition of amines to water, viscosities first increase rapidly, then pass through maxima at 0.2 mole fraction of amines and then decline continuously as the addition of amines is continued. ηE show large positive values, with maxima also at 0.2 mole fraction of amines. The maxima of the curves of η and ηE vs. mole fraction of butylamines follow the order, W + TBA > W + SBA > W + NBA. The ascending part of the η vs. X 2 curves in the water-rich region is explained by the hydrophobic hydration caused by the hydrocarbon tails and the hydrophilic effect due to — NH2 group of amines. Following the maxima, amine - amine association is preferred, which accounts for the steady decrease of viscosity up to the pure state of amines. 相似文献
2.
《Journal of Coordination Chemistry》2012,65(1-2):25-28
Abstract Fe(II)T(p-X)PP(NH2Bu n )2 (X = H, Cl, CH3, OCH3, TPP = dianion of meso-tetraphenylporphyrin) complexes have been prepared by the reduction of Fe(III) porphrins with n-butylamine in antiformin/dichloromethane in air, and by sodium borohydride reduction. The complexes were characterized by electronic and IR spectra and elemental analysis. 相似文献
3.
钛硅沸石合成中各组分作用研究 总被引:6,自引:2,他引:4
1983年Taramasso等[1]报导了钛硅沸石TS-1的合成。由于在用稀H2O2为氧化剂的低温氧化反应中TS-1的突出催化性能,所以近年来钛硅沸石的合成、表征及催化应用研究一直是热点课题。经典的钛硅沸石合成需要采用昂贵的模板剂-不含碱金属离子的四丙基氢氧化铵(T... 相似文献
4.
采用氢氟酸络合法,在nP/nZr=2.0条件下,以甘氨酸-N,N-双亚甲基膦酸(DMPG)和H3PO4为原料,按不同投料物质的量的比制备了2个α、γ-混合型甘氨酸-N,N-双亚甲基膦酸-磷酸锆层状主体化合物Zr(PO4)0.41(HPO4)0.043[(O3PCH2)2NCH2COOH]0.67.H2O(1)和Zr(PO4)0.21(HPO4)0.038[(O3PCH2)2NCH2COOH]0.82.2H2O(2),用元素分析、X射线衍射、红外光谱、热分析、固体核磁磷谱等对化合物进行了表征,同时研究了与正丁胺客体分子的插层组装性能。 相似文献
5.
Piotr Przybylski Rados?aw Pankiewicz Franz Bartl 《Journal of Molecular Structure》2003,658(3):193-205
A Schiff base of gossypol with n-butylamine [GSBN] was shown to be capable of complexation of 2H+, Li+, Ca2+ and Ba2+ cations. This process of complex formation was studied by ESI mass spectrometry, 1H and 13C NMR and FT-IR spectroscopy as well as by PM5 semiempirical method. It was found that gossypol Schiff base can form a 1:2 complex with H+ and 1:1 complexes with Li+, Ca2+ and Ba2+ cations. In all complexes the Schiff base of gossypol with metal cations exists in enamine-enamine tautomer, whereas in the 1:2 complex with H+ the imine-imine tautomer was found. The metal cations are coordinated through oxygen atoms of the O1H(O1,H) hydroxyl groups and a lone pair of an N-atom. The structures of these complexes were calculated by PM5 semiempirical method and discussed. 相似文献
6.
离子对反相高效液相色谱-蒸发光散射检测法测定三乙膦酸铝的含量 总被引:1,自引:0,他引:1
建立了以正丁胺为离子对试剂的反相高效液相色谱分析三乙膦酸铝含量的方法。采用Symmetry Shield RP18色谱柱分离,以甲醇-0.5%正丁胺水溶液(冰乙酸调节pH 5.0)(体积比为8:92)为流动相,流速为0.8 mL/min,蒸发光散射检测器(ELSD)检测。在上述条件下,三乙膦酸铝与其主要杂质亚磷酸盐、硫酸盐可以获得分离。在100~1200 mg/L范围内,进样质量与峰面积的双对数值呈良好的线性关系。100 mg/L和1000 mg/L两种质量浓度添加水平的回收率分别为100.58%和99.53%,其相对标准偏差(RSD)分别为0.62%和0.49%。该方法简便快捷,为三乙膦酸铝的定量分析提供了更加有效可靠的方法。 相似文献
7.
8.
Silva A. O. S. Souza M. J. B. Aquino J. M. F. B. Fernandes Jr V. J. Araujo A. S. 《Journal of Thermal Analysis and Calorimetry》2004,76(3):783-791
In this work was studied the acid properties of a series of HZSM-12 zeolites with different Si/Al molar ratio. The samples
of ZSM-12 were synthesized by the hydrothermal method starting from a gel with the following molar composition: 20MTEA:10Na2O:xAl2O3:100SiO2:200H2O, where: x=2, 1, 0.67 and 0.50, respectively. After the synthesis, the samples of ZSM-12 were ion-exchanged NH4Cl solution to obtain zeolite in the acid form (HZSM-12). The acid properties were evaluated by n-butylamine thermodesorption in a TG equipment at three different heating rates. The model-free kinetic model was applied
in the TG integral curves to estimate the apparent activation energy (E
a) of the n-butylamine desorption process. The results obtained showed that the HZSM-12 zeolite presents two kinds main of
acid sites: one with E
a in the range of 115-125 kJ mol-1 classified as weak and other kind with E
a varying of 230-250 kJ mol-1 classified as strong.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
9.
XiaoPingRAO XiangKaiFU KaiRAO 《中国化学快报》2004,15(7):871-874
Zirconium proline-N-methylphosphonate-phosphate (α-ZPMPP) was prepared in the presence of HF for the first time. The α-ZPMPP sample is highly crystallized with interlayer distance of 1.52nm. The interlayer distance of complex of α-ZPMPP with n-butylamine (α-ZPMPP-BA) is in 0.45 nm larger than that of α-ZPMPP. The α-ZPMPP possesses different intercalation behavior of host-guest compound from α-ZP. 相似文献
10.
The kinetics of SN2 reaction between phenacyl bromide and various amines in 12 different solvents were studied. Solvent effects on the rate of this reaction and free energy of activation, ΔG# , were interpreted by applying the Abraham-Kam-let-Taft (AKT) equation. UK solvent polarity (π1*), solvent hydrogen-bond basicity (β1) and Hildebrand cohesive density energy (δH2) are those parameters which increase the rate constant and decrease ΔG# , while solvent hydrogen-bond acidity (α1) will have the compensatory effect. A comparison among obtained values of second rate constants, k2, for different amines in a given solvent indicates that the amine reactivities are highly dependent on their structures. The consequent decrease of the rate constant for different amines in any given solvent was found to be: primary > secondary> tertiary. This order results from steric effects of amines. 相似文献