共查询到18条相似文献,搜索用时 109 毫秒
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尾式5—{对—[2—(2—甲乙基)—1,3—二恶烷]苯氧基}—10,15,20—三苯基卟啉及其金属配合物的合成与表征 总被引:1,自引:0,他引:1
《化学试剂》2003,25(1):6-7,10
2-(2-甲乙基)-1,3-二恶烷与存在无水K2CO3的DMF的溶剂中的5-(4-羟基苯基),10,15,20-三苯基卟啉反应,合成了一新种型卟啉5-{对-[2-(2-甲乙基)-1,3-二恶烷]苯氧基}-10,15,20-三苯基卟啉,并据此制得了锌、钯、钌配合物,对化合物的结构分别用UV-Vis,IR,^1HNMR三元分析等手段进行了表征。 相似文献
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meso-四-(4-辛氧基-3-甲氧基苯基)卟啉及其金属配合物的合成与表征 总被引:3,自引:0,他引:3
报道了一种新型对称型卟啉化合物meso-四-(4-辛氧基-3-甲氧基苯基)卟啉(TOMPPPH2)及其金属钌、钯配合物(Ru(DMF)2TOMPPP,PdTOMPPP)的合成,并通过可见光谱,红外光谱,核磁共振氢谱和元素分析等对这些卟啉化合物的结构进行了表征。 相似文献
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5-(对-氨基苯基)-10,15,20-三苯基卟啉在无水碳酸钾和无水碘化钾催化下与氯乙酸乙酯进行亲核取代反应得到5-(ρ-β-乙酸乙酯基氨基苯基)-10,15,20-三苯基卟啉产率8.5%;其与Co(CH3COO)2反应得到5-(ρ-β-乙酸乙酯基氨基苯基)-10,15,20-三苯基卟啉络钴(Ⅱ),产率88.0%,其结构经UV-vsible、FT-IR、IHNMR和元素分析进行表征. 相似文献
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R. M. van Hardeveld A. J. G. W. Schmidt J. W. Niemantsverdriet 《Catalysis Letters》1996,41(3-4):125-131
Temperature programming of NO and C2H2 coadsorbed on Rh(111) gives rise to the desorption of a number of gases. Where H2, H2O, CO2 and N2 are the main products at low C2H2 coverages, significant amounts of HCN, CO and NO evolve at higher C2H4 coverages. Static SIMS indicates the formation of a large supply of adsorbed CN species, part of which desorbs as HCN, while the remainder decomposes and is responsible for delayed formation of N2. For the highest C2H4 coverages the majority of the initially adsorbed NO desorbs as HCN. 相似文献
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The anion exchange resin Amberlyst, A-26, forms an efficient matrix for the immobilization of the water soluble complex, HRh(CO)(m-C6H4SO3Na)3)3. Catalysis proceeds in anhydrous alcohol solvents which allows the conversion of water insoluble olefins to aldehydes. Activities and selectivities are similar to both supported aqueous phase catalysts and to the neutral complex, HRh(CO)(PPh3)3 in non-aqueous solvents. The catalyst preparation minimizes the quantity of water in the supported catalyst; the lack of water is thought to be responsible for an increase in catalyst stability toward oxidation. 相似文献
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以邻苯基苯酚和丙酮为原料,盐酸为催化剂,巯基丙磺酸为助催化剂,通过缩合反应合成了2,2-双(3-苯基-4羟基苯基)丙烷(双OPP-A),研究了原料配比、催化剂用量、反应温度、反应时间等因素对反应的影响,通过实验确定了合成双OPP-A的最优条件为:n(邻苯基苯酚):n(丙酮):n(盐酸):n(巯基丙磺酸)=8:2:4:1,反应温度为60℃,反应时间24h,双OPP-A收率达到78.5%,经重结晶纯度达99.2%。产物通过红外光谱和核磁共振等进行了确证。 相似文献
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Comparative studies have been carried out on the electrosynthesis of sodium phosphates in the cathode compartment of an industrial membrane cell supplied with phosphoric acid of concentrations ranging from 1 to 2 mol dm–3. The anode compartment of the cell was supplied with brine containing 25% NaCl. Du Pont Nafion® membranes of types N-423, N-901 and N-961 were used. It was found that current efficiencies for the production of sodium phosphates exceeded 96%, this being higher than that for sodium hydroxide and, in spite of the different properties of the membranes, these efficiencies were similar. With N-423 membrane, the current efficiency was 2 3% lower than that for other membranes, but at the same time, the voltage of the cell was lower by 8 12%. Thus, N-423 membrane gives better performance during sodium phosphate synthesis as compared to membranes N-901 and N-961. 相似文献
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The hydrogen chemisorption on Pt/Al2O3 was investigated by temperature programmed desorption. The activation energy of desorption strongly depends on the hydrogen surface coverage. The chemisorption process is shown to be activated. High temperature H2 desorption (spilled-over hydrogen) is due to reoxidation of reduced parts of the carrier surface by water or -OH groups. 相似文献
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多孔g-C3N4基光催化材料由于具有较高的比表面积、丰富的反应活性位点和较短的电子传递路径等特点,能较好地解决块体g-C3N4基材料存在的比表面积小、光生载流子复合快及可见光利用效率低等问题,因而具有广阔的发展前景和应用潜力。本文主要从以下方面进行综述:多孔g-C3N4基光催化材料常用的制备方法,包括硬模板法、软模板法、水热合成法、热聚合法、超分子自组装法;多孔g-C3N4基材料在光催化领域的应用,包括光解水制氢、光催化降解有机污染物、光催化去除氮氧化物和光催化还原CO2等;最后指出了当前影响多孔g-C3N4基光催化材料发展的关键问题,并对其在光催化领域的应用前景进行了展望。 相似文献
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The mediated electrosynthesis of H2O2 in acidic solutions (pH 0.9–3.0) was investigated in a three-phase, aqueous/organic/gaseous system using 2-ethyl-9,10-anthraquinone (EtAQ) as mediator (redox catalyst). The main hydrogen peroxide producing route is the in situ mediating cycle: EtAQ electroreduction–homogeneous oxidation of anthrahydroquinone (EtAQH2). The organic phase was composed of tributylphosphate solvent (TBP) with 0.2 M tetrabutylammonium perchlorate (TBAP) supporting electrolyte, 0.06 M tricaprylmethylammonium chloride (A336) surface active agent, and 0.1–0.2 M EtAQ mediator. Part I of this two part work deals with the physico-chemical characteristics of the emulsion electrolyte (e.g., ionic conductivity, emulsion type, H2O2 partition between the aqueous and organic phases), and kinetic aspects (both electrode and homogenous) of the mediation cycle. Furthermore, batch electrosynthesis experiments are presented employing reticulated vitreous carbon cathodes (specific surface area 1800 m2 m–3) operated at superficial current densities of 500–800 A m–2. During 10 h batch electrolysis involving the emulsion mediated system with O2 purge at 0.1 MPa pressure, H2O2 concentrations in the range 0.53–0.61 M were obtained in 0.1 M H2SO4 (pH 0.9) and 2 M Na2SO4(acidified to pH3). The corresponding apparent current efficiencies were from 46 to 68%. Part II of the present work describes investigations using flow-by fixed-bed electrochemical cells with co-current upward three-phase flow. 相似文献
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A convenient partial synthesis of the lactone (+)- 10 is reported starting from the readily available methyl (S)-(+)-3-hydroxy-2-methylpropanoate (+)- 1 . Furthermore, an efficient three step route to the optically active saturated isoprene unit (-)- 13 in high yield starting from the lactone (+)- 10 is reported for the first time. 相似文献