activation energies of various hydridetransferreactions was developed according to transition state theory using the Morse-type free energy curves of hydride donors to release a hydride anion and hydrideacceptors to capture a hydride anion and by which the activation energies of 187 typical hydride self-exchange reactions and more than thirty thousand hydride cross transferreactions in acetonitrile were
Heterolysis and homolysis energies for some carbon-oxygen bonds
作者:Edward M. Arnett、Kalyani Amarnath、Noel G. Harvey、Sampath Venimadhavan
DOI:10.1021/ja00176a039
日期:1990.9
Methods described previously for obtaining heterolysis (ΔH het ) and homolysis (ΔH homo ) enthalpies for bonds that can be cleaved to produce resonance-stabilized carbeniumions, anions, and radicals are extended to the study of carbon-oxygen bonds through the reactions of resonance-stabilized carbeniumions with substituted phenoxide ions. Titration calorimetry was used to obtain the heat of heterolysis
先前描述的获得异裂 (ΔH het ) 和均裂 (ΔH homo ) 焓的方法可以裂解以产生共振稳定的碳正离子、阴离子和自由基,通过共振反应扩展到碳-氧键的研究- 稳定的碳正离子与取代的酚盐离子。滴定量热法用于获得异解热,二次谐波交流伏安法(SHACV)法用于获得阴离子的可逆氧化电位
Laser flash photolysis study of photodehydroxylation phenomena of 9-phenylxanthen-9-ol and photobehavior of related intermediates. Enhanced electrophilicity of 9-phenylxanthenium cation singlet
作者:Robert E. Minto、Paritosh K. Das
DOI:10.1021/ja00206a014
日期:1989.11
In the course of 248-nm laser flash photolysis, solutions of 9-phenylxanthen-9-ol (1) undergo homolytic and heterolytic photodehydroxylation, the relative efficiency of which depends strongly on the solvent nature. Polar/hydroxylic solvents, particularly aqueous mixtures, cause copious formation of 9-phenylxanthenium cation (2), the ground, and excited-state properties of which are conveniently studied
Simple and modular design platform of bimodal turn-on chemodosimeters for oxophilic metal cations
作者:David T. Hogan、Todd C. Sutherland
DOI:10.1039/c8nj04198a
日期:——
Three chemodosimeters that exhibit up to 3000-fold enhancement in turn-on visible colour and emission in the presence of oxophilic metal cations.
三种化学传感器在氧亲合性金属阳离子存在时表现出高达3000倍的开启可见颜色和发射增强。
Composition de teinture des fibres kératiniques comprenant un colorant direct sulfonamidoxanthenique et procédé de teinture la mettant en oeuvre
申请人:L'ORÉAL
公开号:EP1702611A2
公开(公告)日:2006-09-20
La présente invention concerne une composition de teinture des fibres kératiniques, en particulier des fibres kératiniques humaines et, plus particulièrement, des cheveux, qui comprend au moins un composé choisi parmi les colorants directs de type sulfonamidoxanthénique autrement dit les dérivés sulfonamides de xanthènes.
L'invention concerne, en outre, un procédé de teinture des fibres kératiniques, en particulier des fibres kératiniques humaines et, plus particulièrement, des cheveux qui met en oeuvre ladite composition.
L'invention concerne enfin un dispositif à plusieurs compartiments comprenant un compartiment renfermant ladite composition tinctoriale.