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1.
大口径毛细管气相色谱法直接测定植物生长激素 总被引:15,自引:0,他引:15
采用大口径毛细管气相色谱法对多种植物生长激素进行了测定。萘乙酸(NAA)、吲哚-3-乙酸(IAA)、吲哚-3-丁酸(IBA)、脱落酸(ABA)和赤霉素(GA)5组分,不需衍生化处理,直接进样,获得了良好的分析结果。其NAA、IAA、IBA、ABA、和GA的最低检测限分别为5.2×10-5、1.2 ×10-4、1.7 ×10-4、2.2 × 10-4、8.5 ×10-4g/L;其回收率分别为 92.4%、91.8%、98.2%、89.7%、91.4%。方法快速、简便。 相似文献
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铽与1—苯基—3—甲基—4—异丁酰基吡唑啉酮—5和中性配体混配配合物… 总被引:4,自引:0,他引:4
合成了铽与1-苯基-3-甲基-4-异丁酰基吡唑啉酮和不同中性配体的4个三元配合物Tb(PMIBP)3.2H2O、Tb(pmibp)3.Dipy、Tb(PMIBP)3、Phen和Tb(PMIBP)3.2TPPO(Dipy=2.2’-联吡啶、Phen=1,10-邻菲罗啉,TPPO=三苯基氧膦)。 相似文献
3.
铽与4—酰代吡唑啉酮—5的三元配合物的合成与荧光性质 总被引:4,自引:0,他引:4
合成并表征了一系列铽与含不同4-酰代的1-苯基-3-甲基-吡唑啉酮-5的三元配合物Tb9L)3.2H2O和Tb(L)3.Dipy「L=1-苯基-3-甲基-4-乙酰基吡啥林酮-5(PMAP),1-苯基-3-甲基-4-丙酰基吡唑啉酮-5(PMPP),1-苯基-3-甲基-4-异丁酰基吡唑啉酮-5(PMIBP),1-苯基-3-甲基-4-特戊酰基吡唑啉酮-5(PMPVP),1-苯基-3-甲基-4-苯甲酰基吡 相似文献
4.
稀土氨基酸混配型配合物的合成与表征 总被引:9,自引:0,他引:9
合成了14种稀土元素与甘氨酸(Gly)、L-丙氨酸(Ala)的混配型三元固态配合物RE(Gly)_(2.5)(Ala)_(1.5)(ClO_4)_3·H_2O(RE=La~Lu,Pm除外)。并对配合物进行了红外、核磁、荧光、X射线粉末衍射和热分析。铕(Ⅲ)、铽(Ⅲ)三元配合物的荧光强度(Eu:~5D_0→~7F_2;Tb:~5D_4→~7F_5,~7F_6)比相应铕(Ⅲ)或铽(Ⅲ)水合高氯酸盐增大10倍。 相似文献
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不同异氰酸酯固化的蓖麻油/酚氧树脂聚氨酯的力学性能 总被引:1,自引:0,他引:1
以BF3·OEt2为催化剂,4,4-二羟基二苯基丙烷与环氧氯丙烷反应,生成端羟基的酚氧树脂(A),A与蓖麻油(B)混合,用3种异氰酸酯(TDI、IPDI和HDI)作为固化剂,制得交联聚氨酯。研究了这3种聚氨酯的力学性能及形态与组成和二异氰酸酯结构的关系;改变NCO/OH摩尔比及B与A的质量比,可以制得具有较好力学性能的聚氨酯材料。蓖麻油,酚氧树脂,聚氨酯,力学性能 相似文献
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用气相色谱-微波等离子体-原子发射光谱检测器(GC-MIP-AES)测定水中微量无机砷,在酸性条件下,As(Ⅲ与2,3-二巯基丙醇(BAL)的反应生成挥发性的环状二硫胂衍生物,被甲苯萃取,在181.379nm和189.041nm处GC-MIP-AES分别检测衍生物中硫砷的发射信号,检出限为15pg(以砷计)加标回收率96.35-106.03%,变异系数〈4.5%。 相似文献
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在PH5.3的HAc-NaAc,2-(3,5-地溴-2-吡啶偶氮)-5-二乙氨基酚(3,5-Br2-PADAP)、溴代十六基三甲铵溶液中,用线性扫描示波极谱法可得到锑(Ⅲ)浓度在3.3×10^-8-2.5^10^-6mol/L范围内呈线性关系。 相似文献
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锆—7—碘—8—羟基喹啉—5—磺酸—EDTA—表面活性剂体系的荧光光度法研究 总被引:2,自引:0,他引:2
在pH6.2的HAc-NaAc缓冲溶液中,在溴化十六烷基三甲基胺(CTMAB)存在下,Zr(Ⅳ)与7-碘-8-羟基喹啉-5-磺酸(H2QSI)及EDTA形成了四元荧光配合物,其组成为:Zr:H2QSI:EDTA:CTMAB=1:1:1:3。据此建立了锆的选择性好,灵敏度高的荧光测定方法,方法检测限为1.2ng/mL。锆的线性范围为1.6ng~1.0μg/mL。用于铜合金中微量锆的测定,结果令人满意 相似文献
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A soluble polymer-supported synthesis of indoles via palladium-mediated heteroannulation of terminal alkynes with o-iodoanilines has been described. The protocol provides a useful tool for constructing combinatorial indole libraries. 相似文献
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Two new indole derivatives have been synthesized by a one-pot procedure and their potential as fluorescence probes for metal ions was investigated. The sensor capability of 1 and 2 toward cations such as Ag+, Cu2+, Zn2+, Cd2+, Pb2+, and Hg2− was studied in dichloromethane solution by absorption, fluorescence emission, and 1H NMR titrations. Both probes showed selectivity for Ag+ and Hg2+ ions. The results suggest that these compounds may serve as promising models for future design of novel and more potent sensors. 相似文献
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产酸克雷伯氏菌SG-11是从水稻根面分离的植物根际促生细菌,能有效的促进水稻植物的生长和发育,为探索其促生机理,通过色谱 -质谱联用、薄层色谱与高效液相色谱的定性和定量分析,证明了在产酸克雷伯氏菌SG-11的代谢产物中存在着较高浓度的植物生长素吲哚 -3-乙酸。 相似文献
14.
Claudio C. Silveira Samuel R. Mendes Lucas Wolf Guilherme M. Martins 《Tetrahedron letters》2010,51(34):4560-4562
Anhydrous CeCl3 was successfully used as catalyst for the synthesis of several 3-propargyl indoles in good yields through the reaction of indole with propargyl alcohols in nitromethane. 相似文献
15.
Ashley W. Jones 《Tetrahedron》2004,60(47):10779-10786
A range of 3-substituted-4,6-dimethoxyindoles bearing electron-withdrawing groups in either the 2- or 7-position, can be nitrated using nitric acid adsorbed on silica, to give 7-nitro and 2-nitro-indoles, respectively. A 1-cyano-indole gives regioselectively the 2-nitro-indole with loss of the cyano group. 相似文献
16.
Claudio C. Silveira Samuel R. Mendes Lucas Wolf Guilherme M. Martins 《Tetrahedron letters》2010,51(15):2014-3697
Anhydrous CeCl3 was successfully used as a catalyst for the synthesis of several 3-sulfenyl indoles in good to excellent yields through the reaction of indole with N-(alkylthio) and N-(arylthio)phthalimides in DMF. 相似文献
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This study reports the compatibility of the biobased polymers poly(3-hydroxybutyrate-co-3- -hydroxyhexanoate) (PHBH) and poly(lactic acid) (PLA), as well as the effect of the addition of a reactive epoxy compatibilizer (REC) to the PHBH/PLA blend. The chemical structure, thermal performance, surface morphology and mechanical properties of the blends were measured using fourier transform infrared spectroscopy, differential scanning calorimetry, dynamic thermo-mechanical analysis, thermogravimetric analysis, scanning electron microscopy, and impact and tensile testing.PHBH and PLA were partially compatible, and a PHBH/PLA mass ratio of 80:20 was selected for evaluation with an REC. The REC decreased the difference between the glass-transition temperatures of PHBH and PLA, decreased the particle size of the dispersed phase of the PHBH/PLA blend and produced uniform particle distribution. Moreover, the REC improved the elongation at break and impact strength of the PHBH/PLA blend. These results show that the addition of an REC improves the compatibility of PHBH and PLA. 相似文献
19.
Jin‐Cherng Lien Yu‐Dong Jiang Chun‐Jen Chen Sheng‐Chu Kuo Li‐Jiau Huang 《中国化学会会志》2008,55(5):1160-1165
In continuing search for novel cell differentiation agents, a series of derivatives of indole‐3‐acetic acid and indole‐3‐carboxylic acid were prepared and tested against HL‐60 cells for their differentiation and antiproliferation activities. Among them, N‐ethyl‐1‐benzylindole‐3‐carboxamide ( 14 ) was the most potent, whereas N‐methyl 1‐benzylindole‐3‐acetamide ( 5 ) and N‐methyl 1‐benzylindole‐3‐carboxamide ( 13 ) synergistically potentiated with all‐trans‐retinoic acid to induce cell differentiation as well as antiproliferation. Our results indicate that these compounds are effective cell differentiation and antiproliferation agents in combination with retinoic acid. 相似文献
20.
Substituted indole scaffolds are often utilized in medicinal chemistry as they regularly possess significant pharmacological activity. Therefore the development of simple, inexpensive and efficient methods for alkylating the indole heterocycle continues to be an active research area. Reported are reactions of trichloroacetimidate electrophiles and indoles to address the challenges of accessing alkyl decorated indole structures. These alkylations perform best when either the indole or the imidate is functionalized with electron withdrawing groups to avoid polyalkylation. 相似文献