这项研究检查了量子点 (QD) 与其表面分子之间的电子耦合,作为它们相互作用模式的函数。作为探针,监测和评估了 CdSe QD 和酞菁 (Pcs) 之间的能量转移 (ET),包括轴向酞菁配体的官能化、桥接 QD 供体和 Pc 受体的官能团的体积以及数量功能化的轴向配体。合成了新的硅 PC 及其与 CdSe 量子点的共轭物。通过稳态和飞秒时间分辨吸收光谱研究了 ET 效率和动力学。我们观察到 ET 效率随着官能团体积的增加而降低,这可以通过增加 ET 对之间的空间位阻来解释。此外,
Reactions of strained organosilicon heterocycles with nonacarbonyldi-iron(0). Part I. Reactivity and mechanism
作者:Colin S. Cundy、Michael F. Lappert、Jacques Dubac、Pierre Mazerolles
DOI:10.1039/dt9760000910
日期:——
The formation of 2,2,2,2-tetracarbonyl-1-sila-2-ferracyclopentanes by the reaction of silacyclobutanes with nonacarbonyldi-iron is described, and the nature of the process discussed. Completely regioselective reactions are found with Me2[graphic omitted](Me)H[Si–CH2 and not Si–C(Me)H cleavage] and with two silabenzocyclobutenes R2[graphic omitted]H2(R = Me or Ph)[C(arly)–Si and not C(alkyl)–Si cleavage]
描述了通过硅烷基环丁烷与九碳二基二铁的反应形成2,2,2,2-四羰基-1-硅2-2-ferracyclopentanes,并讨论了该方法的性质。发现了与Me 2 [未图示](Me)H [Si-CH 2而不是Si–C(Me)H裂解]和两个硅基苯并环丁烯R 2 [未图示] H 2(R = Me或Ph的完全区域选择性反应))[C(芳基)-Si,而不是C(烷基)-Si裂解]。使用XMe [H] 2的两种异构体的混合物(X = Bu n,异构体比例为4:1:X = MeO,异构体比例为7:3)时,该反应是立体特异性的,两者之间的异构体比例没有显着变化反应物和产物。结论是,这种[Fe(CO)4]插入可能是亲电的C-Si裂解反应,并且广泛使用该术语的过程是一致的。
Selective Enzymatic Oxidation of Silanes to Silanols
作者:Susanne Bähr、Sabine Brinkmann‐Chen、Marc Garcia‐Borràs、John M. Roberts、Dimitris E. Katsoulis、K. N. Houk、Frances H. Arnold
DOI:10.1002/anie.202002861
日期:2020.9
megaterium, CYP102A1) has promiscuous activity for oxidation of hydrosilanes to give silanols. Directed evolution was applied to enhance this non‐native activity and create a highly efficient catalyst for selectivesilaneoxidation under mild conditions with oxygen as the terminal oxidant. The evolved enzyme leaves C−H bonds present in the silane substrates untouched, and this biotransformation does
Structural Data Showing the Existence of LDI Bonds between the Rings of Dimeric Cofacial Siloxysilicon Phthalocyanines
作者:Benjamin W. Sturtz、Curtis E. Moore、Tyler S. Jenkins、Jennifer L. Miller、Carlisle D. Momberger、Arnold L. Rheingold、Malcolm E. Kenney
DOI:10.1021/acs.jpca.8b09247
日期:2019.1.17
In a pair of earlier papers, the existence of long directional interaction bonds, LDI bonds, was postulated on the basis of data for cofacial oligomeric siloxysilicon phthalocyanines from this laboratory and data for other cofacial oligomeric phthalocyanines from the literature. However, the combined data are not fully suited to the purpose for which they were used. Here an alternative approach is
Brevnova, T. N.; Semenov, V. V.; Razuvaev, G. A., Journal of general chemistry of the USSR, 1981, vol. 51, p. 1729 - 1735
作者:Brevnova, T. N.、Semenov, V. V.、Razuvaev, G. A.
DOI:——
日期:——
Silanol reactivity: evaluation of silanolate as a metalation-directing group
作者:Scott M. Sieburth、Louis Fensterbank
DOI:10.1021/jo00075a026
日期:1993.11
Alkali metal salts of dimethylarylsilanol and di-tert-butylphenylsilanol were treated with organometallic reagents to determine the viability of silanolates as ortho-metalation-directing groups. When dimethylphenylsilanol was treated with an excess of n-butyllithium, metalation was not observed. Heating these reactions led to substitution of the methyl and phenyl groups on silicon by n-butyl groups. When a m-methoxy group was present, metalation of the aromatic ring was observed between the two substituents. The more hindered di-tert-butylphenylsilanol was inert to excess n-butyllithium, but treatment of the potassium salt of this silanol with n-butyllithium results in metalation largely at the meta and para positions, with only traces of ortho products. Calculated deprotonation enthalpies of arylsilanes using AM1 can explain some of the observed acidities from this study as well as observations made in a related study of arylsilane metalation by Schlosser et al.