在7.5 K的Ar矩阵中研究了H 2 S 2及其266 nm光解产物的红外光谱。H2 S 2的反对称和对称拉伸以及H 2 S 2的反对称弯曲分别为2556.6、2553.8和880.3 cm -1。暂时将在光解过程中出现在2463、2460和903 cm -1处的吸收归因于HS 2自由基。两个主要的解离通道为:H 2 S 2 + hν →HS 2 + H和H 2 S 2 + hν →S 2 + H 2,其分支比接近1。
Hydrogen persulfide (H2S2) plays an important role in sulfur-based redox signaling mechanisms. Herein, we developed a visible light activated ESIPT based H2S2 donor using a p-hydroxyphenacylphototrigger. The unique feature of the designed H2S2 donor system is the ability to monitor the H2S2 release in real time through a non-invasive fluorescence color change approach, with the color changing from
Redox-untersuchungen an jodboranen VI. Zur kenntnis von diborylsulfanen, R2B-Sx-BR2
作者:Walter Siebert、Eduard Gast、Max Schmidt
DOI:10.1016/s0022-328x(00)92946-2
日期:1970.7
with H2S2 or Na2S2 leads to the formation of bis-(dialkylboryl)disulfanes,R2B-S-S-BR2(VI). This new class of compounds exhibits a high thermal, but a low hydrolytical, stability. Attempts to obtain diborylsulfanes, R2B-S-BR2(V), by removing one sulfur atom from (VI) result in products formed by the rearrangement of (V). The reaction of disilthiane with dialkylhaloborane yields (V), stable only in solution
二烷基碘硼烷与硫之间的氧化还原反应以及二烷基卤硼烷与H 2 S 2或Na 2 S 2的反应导致形成双-(二烷基硼基)二硫醚R 2 B-SS-BR 2(VI)。这类新化合物显示出高的热稳定性,但水解性却很低。尝试获得二硼烷基硫烷,R 2 B-S-BR 2(V),通过从(VI)中除去一个硫原子得到由(V)的重排形成的产物。二甲噻吩与二烷基卤硼烷的反应产生(V),仅在溶液中稳定。稳定的二硼烷基硫烷是由二苯基碘硼烷和甲硅烷基或硫,以及通过合适的硼烷基硫醚的热缩合而获得的。
Activation of the S−H Group in Fe(μ<sub>2</sub>-SH)Fe Clusters: S−H Bond Strengths and Free Radical Reactivity of the Fe(μ<sub>2</sub>-SH)Fe Cluster
作者:James A. Franz、Suh-Jane Lee、Thomas A. Bowden、Mikhail S. Alnajjar、Aaron M. Appel、Jerome C. Birnbaum、Thomas E. Bitterwolf、Michel Dupuis
DOI:10.1021/ja904602p
日期:2009.10.28
respectively. Free energy and NMR chemical shift calculations confirm the NMR assignments and populations of Fe(2)S(2)H(2) and Fe(2)S(2)MeH isomers. Derived radicals Fe(2)S(2)H(*) and Fe(2)S(2)Me(*) exhibit singly occupied HOMOs with unpaired spin density distributed between the two Fe atoms, a bridging sulfur, and d(sigma)-bonding between Fe centers. The S-H solution bonddissociation free energy (SBDFE) of
The ultraviolet absorption spectrum of the transient HS2 radical produced in the flash photolysis of H2S2 was recorded. The spectrum observed in the λ = 3070–3800 Å region is assigned to the Ã2A′ ← X2A″ electronic transition, and three progressions to the SS stretching (ν′1), SSz.sbnd;H bending (ν′2) and SH stretching (ν′3) vibrations of the 2A′ upper electronicstate. Open-shell CNDO/2 calculations
Photolysis of hydrogen sulphide in low-temperature matrices
作者:A.J. Barnes、H.E. Hallam、J.D.R. Howells
DOI:10.1016/0022-2860(74)87014-6
日期:1974.12
Abstract Photolysis of hydrogen sulphide in argon, nitrogen and carbonmonoxide matrices at 20 K produces HS radicals and S atoms. On warming the matrix, H 2 S 2 and S 2 molecules are formed as a result of recombination reactions. The latter are identified by a blue-purple emission observed during warm-up of the matrix.
摘要 氩气、氮气和一氧化碳基质中的硫化氢在 20 K 下光解产生 HS 自由基和 S 原子。在加热基质时,由于重组反应而形成H 2 S 2 和S 2 分子。后者通过在基质预热期间观察到的蓝紫色发射来识别。