Detail of "6825-20-3"

Reference

Determination of N-NO Bond Dissociation Energies of N-Methyl-N-nitrosobenzenesulfonamides in Acetonitrile and Application in the Mechanism Analyses on NO Transfer

Determination of N-NO Bond Dissociation Energies of N-Methyl-N-nitrosobenzenesulfonamides in Acetonitrile and Application in the Mechanism Analyses on NO Transfer. Zhu, Xiao-Qing; Hao, Wei-Fang; Tang, Hui; Wang, Chun-Hua; Cheng, Jin-Pei (State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, Peop. Rep. China). Journal of the American Chemical Society, 127(8), 2696-2708 (English) 2005 American Chemical Society. CODEN: JACSAT. ISSN: 0002-7863. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Section cross-reference(s): 6, 67 The heterolytic and homolytic N-NO bond dissocn. energies of seven substituted N-methyl-N-nitrosobenzenesulfonamides (abbreviated as G-MNBS, G = p-OCH3, p-CH3, p-H, p-Cl, p-Br, 2,5-2Cl, m-NO2) in acetonitrile soln. were evaluated for the first time by using titrn. calorimetry and relative thermodn. cycles according to Hess' law. The results show that the energetic scales of the heterolytic and homolytic N-NO bond dissocn. energies of G-MNBS in acetonitrile soln. cover the ranges from 44.3 to 49.5 and from 33. 43012-92-6 and 6825-20-3 which are cas registry numbers are also used here.0 to 34.9 kcal/mol for the neutral G-MNBS, resp., which indicates that N-methyl-N-nitrosobenzenesulfonamides are much easier to release a NO radical (NO·) than to release a NO cation (NO+). The estn. of the heterolytic and homolytic (N-NO)-· bond dissocn. energies of the seven G-MNBS radical anions in acetonitrile soln. gives the energetic ranges of -15.8 to -12.9 and -3.1 to 1.8 kcal/mol for the (N-NO)-· bond homolysis and heterolysis, resp., which means that G-MNBS radical anions are very unstable at room temp. and able to spontaneously or easily release a NO radical or NO anion (NO-), but releasing a NO radical is easier than releasing NO anion. These detd. N-NO bond dissocn. energies of G-MNBS and their radical anions have been successfully used in the mechanism analyses of NO transfer from G-MNBS to 3,6-dibromocarbazole and the reactions of NO with the substituted N-methyl-benzenesulfonamide nitranions (G-MBSN-) in acetonitrile soln. .

The synthesis and properties of iridium cored dendrimers with carbazole dendrons

All Rights Reserved. Some chemicals with cas registry numbers like 6825-20-3 and 667935-20-8 are also used. The synthesis and properties of iridium cored dendrimers with carbazole dendrons. Lo, Shih-Chun; Namdas, Ebinazar B.; Shipley, Christopher P.; Markham, Jonathan P. J.; Anthopolous, Thomas D.; Burn, Paul L.; Samuel, Ifor D. W. (Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, UK). Organic Electronics, 7(2), 85-98 (English) 2006 Elsevier B.V. CODEN: OERLAU. ISSN: 1566-1199. DOCUMENT TYPE: Journal CA Section: 29 (Organometallic and Organometalloidal Compounds) Section cross-reference(s): 22, 72, 73, 76 A convergent procedure was developed for the prepn. of fac-tris[2-(pyridin-2-yl)phenyl]iridium(III) cored dendrimers with first- and second-generation dendrons that each contain one and two carbazole units, resp. The carbazole moieties are both an electroactive moiety and a branching unit in the dendron. The photoluminescence quantum yields of neat films of the first- and second-generation dendrimers were 48 ± 5% and 39 ± 4%, resp. These values are substantially higher than those for equiv. first- and second-generation dendrimers with Ph moieties at the branching points of the dendrons instead of the carbazole units. The improved solid state luminescent properties can be attributed to the increased steric demand of the carbazole unit relative to the Ph ring, which reduces more effectively the intermol. interactions that cause the cores to be less emissive. Electrochem. expts. showed that both the core of the dendrimers and the dendrons were electroactive. Thin film hole mobilities of the first-generation dendrimer with the carbazolyl branching units in the dendrons were higher than those of the equiv. dendrimer with biphenyl branching units across a range of fields. .