共查询到20条相似文献,搜索用时 62 毫秒
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地双膦配体羰基铁化合物的紫外-可有收峰作发属,讨论了确定金属有机化合物UV-VIS、M-LCT带的方法,研究了卤素对M-LCT带,d-d跃迁吸收的影响以及CT带的浓度效应。 相似文献
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利用五羰基溴化锰和2-吡啶甲醛以及卤代苯胺通过一步法合成得到了3个含席夫碱配体的锰羰基配合物[Mn(CO)3(py(CH=N)ph-X)Br],其中X=Cl (1)、Br (2)、I (3),并采用核磁、X射线单晶衍射、红外光谱、紫外可见光谱和荧光光谱对其进行了表征。这类配合物在非光照下稳定,在可见光(LED蓝光、绿光和红光)作用下分解释放CO,可以作为光诱导的一氧化碳释放剂(photoCORMs)。研究表明蓝光是促进配合物分解释放CO的最有效光源。此外,CO释放动力学分析显示配合物分解释放CO过程符合一级动力学模型。配合物3的释放研究表明脱氧肌红蛋白能够捕捉所释放的CO。尽管这些配合物本身的细胞毒性(IC50)达到微摩尔级,但光照下的细胞兼容性有显著改善,上升为接近100微摩尔级。这些配合物具有荧光性质,在450 nm激发波长下在500~700 nm范围内发射一定强度的荧光,可以作为荧光标记物用以监测细胞或生物体内释放剂分布及CO释放情况。 相似文献
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利用五羰基溴化锰和2-吡啶甲醛以及卤代苯胺通过一步法合成得到了3个含席夫碱配体的锰羰基配合物[Mn (CO)3(py (CH=N) ph-X) Br],其中X=Cl (1)、Br (2)、I (3),并采用核磁、X射线单晶衍射、红外光谱、紫外可见光谱和荧光光谱对其进行了表征。这类配合物在非光照下稳定,在可见光(LED蓝光、绿光和红光)作用下分解释放CO,可以作为光诱导的一氧化碳释放剂(photoCORMs)。研究表明蓝光是促进配合物分解释放CO的最有效光源。此外,CO释放动力学分析显示配合物分解释放CO过程符合一级动力学模型。配合物3的释放研究表明脱氧肌红蛋白能够捕捉所释放的CO。尽管这些配合物本身的细胞毒性(IC50)达到微摩尔级,但光照下的细胞兼容性有显著改善,上升为接近100微摩尔级。这些配合物具有荧光性质,在450 nm激发波长下在500~700 nm范围内发射一定强度的荧光,可以作为荧光标记物用以监测细胞或生物体内释放剂分布及CO释放情况。 相似文献
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二铁六羰基配合物[Fe2(μ-SCH2R)2(CO)6](R=CH (OH) CH2(OH),1)是一个水溶性且能够释放一氧化碳的分子(CORM),我们应用各种光谱技术研究了其与血红蛋白(Hb)、肌红蛋白(Mb)、牛血清白蛋白(BSA)、谷胱甘肽(GSH)和DNA等生物分子的相互作用。红外光谱结果表明,蛋白质和谷胱甘肽均能促进配合物1分解释放CO。该CO释放过程符合一级动力学模型,其中谷胱甘肽促进CO释放的效率最高。紫外吸收光谱变化和荧光猝灭效应也表明这些生物相关分子与二铁羰基配合物之间存在相互作用。蛋白质和配合物1的CD光谱结果显示,配合物没有引起蛋白质的构象变化。pUC19质粒DNA与配合物1之间的作用表明该配合物不会引起DNA损伤。 相似文献
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以十二羰基三钌和o-PPh2C6H4NR2(R=H,Me)配体为原料,成功制备了三种新型羰基钌化合物(μ-o-PPh2-C6H4NH)Ru3(μ-H)(CO)9(2)、(o-PPh2C6H4NH)2Ru(CO)2(3)和(μ-o-PPh2C6H4NMe2)2Ru(CO)3(4).对这三个化合物进行了核磁共振和红外谱学、元素分析和X射线单晶衍射分析表征,并对这三个化合物进行了催化性能研究.化合物2和4可催化苯甲醛加氢反应生成苯甲醇,但是3没有催化活性.从实验角度阐述了膦胺配体钌催化剂的结构与性能关联,进一步探讨了加氢催化反应失活的可能原因. 相似文献
6.
采用3个含巯基基团的水溶性化合物(硫普罗宁、巯基乙胺和巯基甘油)来诱导二铁羰基化合物[Fe2(μ-SCH2CH (OH) CH2(OH))2(CO)6](1)释放CO。为了解决在CO释放过程中形成沉淀的问题,研究了乙二胺四乙酸(EDTA)对分解产物的溶解作用。结果表明EDTA不仅可以成功地预防CO释放体系中沉淀的生成,还可以协同促进化合物1分解释放CO。虽然所选择的配体都含有巯基功能基团,但其对化合物1释放CO的促进作用不同,据此可用于CO释放速率的调控。 相似文献
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综述了桥连或取代环戊二烯基(茚基)铁—铁键羰基化合物的研究进展. 讨论了它们的合成、结构及其反应性. 相似文献
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β┐二羰基化合物的电解氧化偶联反应朱洪友张成敏刘复初*(云南大学化学系昆明650091)关键词β-二羰基化合物,电氧化,偶联反应1997-06-04收稿,1997-12-10修回云南省应用基础研究基金资助项目在有机合成上,β-二羰基化合物的偶联是形成... 相似文献
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MoCl5或WCl6与锌粉及适当的膦配体和CO在常压常温进行反应,合成了含膦配体的炭基钼和钨的化合物(Ph2PR)nM(CO)6-n(M=Mo,W;R=ME,Et,n-Pr,Ph;n=2,3),用该方法也成功地将M(CO)5(M=Mo,W)单元负载到含膦的高分子链上,化合物(Ph2PEt)2Mo(CO)4与HgCl2反应得到含Mo-Hg键的化合物。用(Ph3P)2Mo(CO)4和(Ph3P)2Ni(CO)2二元催化体系,在适当温度和压力下对甲醇羰基化反应进行初步研究,得到了初步研究,得到了醋酸和醋酸甲酯。该催化过程对甲醇的转化率可达92%,对醋酸和醋酸甲酯的选择性可达68%。 相似文献
11.
碳化铁催化剂的制备及其对CO加氢的催化活性 总被引:2,自引:0,他引:2
以Fe2O3为原料,采用两种预处理方法制备了碳化铁催化剂. 结果表明,直接在CO气氛下进行碳化处理,或者以H2预还原后再用CO进行碳化处理均可以制备出碳化铁催化剂. 碳化温度是制备过程中的关键因素. 对于Fe2O3样品,较适宜的碳化温度是350 ℃,而对于添加了K助剂的样品,只有经H2预还原处理后再于350 ℃用CO碳化处理4 h才能将样品完全转化为Fe5C2. 在CO加氢的评价实验中,碳化铁催化剂表现出很高的催化活性,生成的烃类产物中主要是饱和烷
烃,未检测到乙烯的生成. 而在K改性的催化剂上反应产物中烯烃的含量明显提高. 相似文献
12.
Photoinduced Carbon Monoxide Release from Half‐Sandwich Iron(II) Carbonyl Complexes by Visible Irradiation: Kinetic Analysis and Mechanistic Investigation 下载免费PDF全文
Dr. Xiujuan Jiang Limei Chen Xiu Wang Li Long Zhiyin Xiao Prof. Dr. Xiaoming Liu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(37):13065-13072
Three half‐sandwich iron(II) complexes, [Fe(η5‐Cp)(cis‐CO)2X] (X?=Cl?, Br?, I?), were synthesized and characterized. The kinetics of the CO‐releasing behaviour of these complexes upon illumination by visible irradiation in various media was investigated. Our results indicated that the CO release was significantly affected by the auxiliary ligands. Of the three light sources used (blue, green, and red), blue light exhibited the highest efficiency. In the photoinduced CO release, the solvents and exogenous nucleophiles in the media were involved, which allowed their CO‐releasing reaction to comply with pseudo first‐order model rather than the characteristic zero‐order model for a photochemical reaction. In aqueous media (D2O), an intermediate bearing the core of {FeII(cis‐CO)2} involving cleavage of cyclopentadiene was detected. Despite the non‐absorption of the red light, its illumination combined with nucleophilic substitution did cause considerable CO release. Assessment of the cytotoxicity of the three complexes indicated that they showed good biocompatibility. 相似文献
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在不同CO分压下制备了ε-Fe2C,χ'-Fe5C2和θ-Fe3C等系列单相碳化铁,经钝化处理后采用低温N2物理吸附、穆斯堡尔谱、激光拉曼光谱和程序升温脱附技术进行了详细的表征.结果发现,碳化气氛,尤其是碳化温度对所得碳化铁结晶度有所影响.碳化铁表面的积碳程度随碳化气氛中CO分压的升高而增高,而随碳化温度的升高呈抛物线形式增高;不同碳化条件下生成的碳化铁晶型和表面积碳的差异导致其织构性质及其吸附CO的能力不同,低温(200oC)碳化生成的Fe2C表面解离吸附CO的能力显著强于其他碳化铁;低碳气氛中生成的Fe3C上CO的解离脱附量最大;其他条件下生成的碳化铁因表面吸附活性位的破坏和大量沉积碳的生成使得解离吸附CO的能力较弱. 相似文献
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Zhuming Guo Jing Jin Zhiyin Xiao Naiwen Chen Xiujuan Jiang Xiaoming Liu Lingfeng Wu Yi He Shuhua Zhang 《应用有机金属化学》2021,35(1)
Four iron(II) carbonyl complexes, fac‐[Fe (CO)3X2(py)] (X = I?, 1 and Br?, 3 ), fac‐[{Fe (CO)3X2}2(bipy)] (X = I?, 2 and Br?, 4 ), were facilely synthesized by reacting cis‐[Fe (CO)4X2] (X = I?, Br?) with pyridine (py) and 4,4′‐dipyridine (bipy) ligands, respectively, in good yields (70%~85%). These complexes were fully characterized, and the structures of Complexes 2 and 3 were crystallographically analyzed. In dimethyl sulfoxide, they decomposed rapidly to release carbon monoxide (CO), and in methanol, they showed better stability which allowed kinetically analyzing their decomposing behaviors. The self‐decomposing in methanol fitted first‐order kinetics with a half‐time ranging from several minutes to 1 h. Our results suggested that the ligand with great conjugation (bipy) and strong electron‐donating capability (iodide) could stabilize the iron(II) carbonyl complexes. The decomposition of the iodo complexes ( 1 and 2 ) involved the production of iodine radicals. MTT (3‐(4,5‐dimethylthiazol‐2‐yl)‐2,5‐diphenyl tetrazolium bromide) assessments revealed that the efficacy against human bladder carcinoma cell line (RT112) is in the following trend: 1 > 2 > 3 > 4 . The relatively strong efficacy of Complexes 1 and 2 is mainly contributed to the in situ generated iodine radicals. The combination of the cytotoxicity of the in situ generated radicals with the anticancer activity of CO as reported in literatures may lead to developing novel anticancer drugs with enhanced efficacy. 相似文献
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Prof. Dr. Holger Braunschweig Dr. Qing Ye Dr. Mehmet Ali Celik Dr. Rian D. Dewhurst Dr. Krzysztof Radacki 《Angewandte Chemie (International ed. in English)》2015,54(17):5065-5068
A 1,4‐dibora‐1,3‐butadiene iron complex was successfully synthesized through the stoichiometric reaction of an iron bis(borylene) complex with diphenylacetylene. This complex was treated with CO and PMe3, which led to the formation of an unusual six‐membered B2C3O ylidic ring bound to both the PMe3 group and zerovalent iron center. The reaction is a very rare example of the incorporation of both atoms of CO into a ring system. 相似文献
17.
Dr. Kristian Torbensen Dr. Cheng Han Benjamin Boudy Dr. Niklas von Wolff Dr. Caroline Bertail Dr. Waldemar Braun Prof. Dr. Marc Robert 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(14):3034-3038
Molecular catalysts have been shown to have high selectivity for CO2 electrochemical reduction to CO, but with current densities significantly below those obtained with solid-state materials. By depositing a simple Fe porphyrin mixed with carbon black onto a carbon paper support, it was possible to obtain a catalytic material that could be used in a flow cell for fast and selective conversion of CO2 to CO. At neutral pH (7.3) a current density as high as 83.7 mA cm−2 was obtained with a CO selectivity close to 98 %. In basic solution (pH 14), a current density of 27 mA cm−2 was maintained for 24 h with 99.7 % selectivity for CO at only 50 mV overpotential, leading to a record energy efficiency of 71 %. In addition, a current density for CO production as high as 152 mA cm−2 (>98 % selectivity) was obtained at a low overpotential of 470 mV, outperforming state-of-the-art noble metal based catalysts. 相似文献
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Au/Ti-SBA-15的制备及其催化CO氧化性能 总被引:1,自引:0,他引:1
采用气相键合法制备了表面经二氧化钛单层分布修饰的SBA-15材料,并以该材料为载体,用改进的原位沉积沉淀法制备了Au负载量为1%的系列催化剂(Au/Ti-SBA15),考察了它们在CO氧化反应中的催化性能.采用透射电镜、X射线衍射、N2吸附-脱附、紫外-可见漫反射吸收光谱、X射线荧光分析和电感耦合等离子体发射光谱等方法对修饰的载体及其负载金催化剂进行了表征.结果表明,SBA-15孔道对Au颗粒的生长起到很好的限制作用.制得的催化剂在广谱温度范围内均有良好的催化CO氧化活性,不仅在低温具有氧化活性,而且在高达500oC时CO转化率还能达到100%,催化剂的存储稳定性和重现性都较好. 相似文献
19.
The o‐substituted hybrid phenylphosphines, PPh2(o‐C6H4NH2) and PPh2(o‐C6H4OH), could be deprotonated with LDA or n‐BuLi to yield PPh2(o‐C6H4NHLi) and PPh2(o‐C6H4OLi), respectively. When added to a solution of (η5‐C5H5)Fe(CO)2I at room temperature, these two lithiated reagents produce a chelated neutral complex 1 (η5‐C5H5)Fe(CO)[C(O)NH(o‐C6H4)PPh2‐C,P‐η2] for the former and mainly a zwitterionic complex 2 , (η5‐C5H5)Fe+(CO)2[PPh2(o‐C6H4O?)] for the latter. Complex 1 could easily be protonated and then decarbonylated to give 4 [(η5‐C5H5)Fe(CO){NH2(o‐C6H4)PPh2‐N,P‐η2}+]. Complexes 1 and 4‐I have been crystallographically characterized with X‐ray diffraction. 相似文献
20.
Au/Fe2O3催化剂的制备及其对富氢气体中一氧化碳选择性氧化的催化性能 总被引:3,自引:1,他引:3
采用共沉淀法制备了1.5%Au/Fe2O3催化剂,考察了加料方式对Au/Fe2O3催化剂化学组成及其催化富氢气体中CO选择性氧化性能的影响. 结果表明,正加法制备的Au/Fe2O3催化剂的性能明显好于反加法制备的催化剂,80 ℃时前者对富氢气体中CO选择性氧化反应的转化率为94%,CO2选择性为65%,连续反应10 h,催化剂活性没有变化. XRD,XPS和TEM等的测试结果表明,正加法制备的Au/Fe2O3催化剂中金粒子的平均粒径为2~4 nm,金粒子高度分散在载体上,并与载体之间发生了较强的相互作用,从而表现出较高的催化性能. 相似文献