共查询到10条相似文献,搜索用时 46 毫秒
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本文研究了在HgCl2-BiCl3复合催化剂作用下,乙炔氢氯化制氯乙烯均相催化反应的动力学,获得该反应速率方程为:r=(k+k'[BiCl3]/[H+])[HgCl2]·[H+]3[CH≡CH].在25℃时k=0.00239,k'=0.0269,根据实验结果,提出了由两个复杂的连串反应组成的平行反应机理,相应的表观活化能为13.4Kcal/mol及14.8Kcal/mol. 相似文献
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π-烯丙基卤化铁含氮配位体的络合结构被认为是铁体系催化丁二烯聚合反应的活性中心,所以合成具有这种结构的模型化合物并研究其催化活性是很有意义的。我们曾合成了π-烯丙基氯化铁三吡啶配合物并研究了它对丁二烯聚合的催化活性,但所得配合物混有近等当量的卤化镁难以分离。Nesmeyanov曾合成π-烯丙基卤化铁三羰基化合物η~3-C_3H_5FeX(CO)_3(X=Cl,I)。我们的实验结果表明这类配合物对丁二烯聚合无催化活 相似文献
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A. J. W. G. Visser G. J. van Ommen G. van Ark F. Müller J. D. W. van Voorst 《Photochemistry and photobiology》1974,20(3):227-232
Abstract— Using high-intensity actinic light, the chlorophyll a fluorescence transient from HCO- 3 -depleted chloroplasts shows a rapid initial rise (O → I) followed by a slow phase (I → P). In the presence of HCO- 3 , the O → I rise is delayed but the I → P phase is much more rapid. Using low-intensity actinic light, the chlorophyll a fluorescence transient from 3-(3,4-dichlorophenyl)-1,1 dimethylurea (DCMU)-treated chloroplasts is delayed in the presence of HCO- 3 . Bicarbonate increases the amount of delayed light emission from chloroplasts given 10 s illumination with weak blue light (0·4 W/m2 ). DCMU greatly increases the amount of delayed light seen in the presence of HCO- 3 under these conditions but decreases the amount seen in the absence of HCO- 3 . It is suggested that HCO- 3 may somehow form or stabilize, in the dark, a number of reaction centers corresponding to the S1 state in the model of B. Forbush, B. Kok and M. McGloin ( Photochem. Photobiol. 14, 307–321, 1971). 相似文献
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60年代初对ABO_3型稀土硼酸盐的合成、结构和性质的研究已有报道。80年代侧重稀土和金属离子硼酸盐发光规律的研究。 Srivastava曾对GdBO_3中pr~(3+)的光谱及Gd~(3+)对Pr~(3+)的敏化、郭风瑜,李有谟 相似文献