报道了在环境温度和低温下使用亚水杨基-1-萘胺(SN)在3-甲基戊烷(3MP)中的溶液进行纳秒级快速光解研究的结果。除了新发现的三重态,在激发态分子内质子转移(ESIPT)发生后,还形成了两个光致变色瞬态(PCT)。高于140 K时,通常会形成醌型反式互变异构体(1 K tr)。在100 K时,在稳态实验中观察到了第二个PCT,我们暂时将其分配给SN的酮基形式的扭曲构象异构体。瞬态1 K tr通过二阶双质子转移在干燥的3MP中重新烯醇化;在10 -4 M甲醇存在下1的再烯化K tr被质子催化,并且1 K tr的寿命缩短了两个数量级以上。将柔性SN的特性与其他两个受旋转阻碍的“ ESIPT分子”进行比较。
报道了在环境温度和低温下使用亚水杨基-1-萘胺(SN)在3-甲基戊烷(3MP)中的溶液进行纳秒级快速光解研究的结果。除了新发现的三重态,在激发态分子内质子转移(ESIPT)发生后,还形成了两个光致变色瞬态(PCT)。高于140 K时,通常会形成醌型反式互变异构体(1 K tr)。在100 K时,在稳态实验中观察到了第二个PCT,我们暂时将其分配给SN的酮基形式的扭曲构象异构体。瞬态1 K tr通过二阶双质子转移在干燥的3MP中重新烯醇化;在10 -4 M甲醇存在下1的再烯化K tr被质子催化,并且1 K tr的寿命缩短了两个数量级以上。将柔性SN的特性与其他两个受旋转阻碍的“ ESIPT分子”进行比较。
NMR spectra of intramolecularly hydrogen-bonded compounds—II
作者:N.M.D. Brown、D.C. Nonhebel
DOI:10.1016/0040-4020(68)88164-5
日期:1968.1
Schiff bases of aromatic amines and β-diketones including those containing Ph end-groups have been shown to exist as the keto-amine tautomer using NMR spectroscopy. The Schiff bases derived from aromatic amines and 2-hydroxyl-1-naphthaldehyde were concluded to be an equilibrium mixture of the ketoenamine and enolimine forms. The influence of electronic effects in the aromatic amines on the hydrogen-bond
self-sufficient transimination reaction between various types of C=N bonds in organic solvents, with turnover frequencies up to 3600 h(-)(1) and rate accelerations up to 6 x 10(5). The mechanism of the crossover reaction in mixtures of amines and imines is studied, comparing parallel individual reactions with coupled equilibria. The intrinsic kinetic parameters for isolated reactions cannot simply be added
Sc(OTf)(3) 有效地催化有机溶剂中各种类型的 C=N 键之间的自给转移反应,转换频率高达 3600 h(-)(1),速率加速高达 6 x 10(5 )。研究了胺和亚胺混合物中交叉反应的机理,比较了平行的单独反应与耦合平衡。当几种组分混合时,孤立反应的内在动力学参数不能简单地相加,并且系统的行为与构成竞争反应网络核心的独特介质的存在一致。在混合系统中,每个胺或亚胺根据它们对催化剂金属离子中心的结合亲和力竞争同一个中心枢纽。更普遍,
Reactivity of nitric oxide with ruthenium complexes derived from bidentate ligands: structure of a ruthenium nitrosyl complex, photoinduced generation and estimation of nitric oxide
作者:Kaushik Ghosh、Rajan Kumar、Kapil Kumar、Anand Ratnam、U. P. Singh
DOI:10.1039/c4ra04767b
日期:——
[where L2H is (E)-1-((naphthalen-1-ylimino) methyl) naphthalene-2-ol] [H stands for dissociable proton] were synthesized and characterized by UV-Vis, IR and NMR spectral studies. Nitricoxide reactivity studies afforded ruthenium nitrosyl complexes [Ru(L1)(PPh3)(NO2)(NO)Cl] (1a) and [Ru(L2)(PPh3)(NO2)(NO)Cl] (2a) from complexes 1 and 2, respectively. Complexes 1a and 2a were characterized by different
A photochromic latex ink includes an organic polymer; optionally a colorant, and a photochromic compound. The photochromic ink composition has an average particle size from about 20 nm to about 600 nm. The photochromic ink composition is capable of reversibly converting from a first color to a second color in response to a predetermined wavelength scope.
Fluorescence sensing of arsenate at nanomolar level in a greener way: naphthalene based probe for living cell imaging
作者:Animesh Sahana、Arnab Banerjee、Sisir Lohar、Sukanya Panja、Subhra Kanti Mukhopadhyay、Jesús Sanmartín Matalobos、Debasis Das
DOI:10.1039/c3cc43211d
日期:——
Naphthalene–salisaldehyde conjugate (NAPSAL) is established as a novel arsenate (H2AsO4−) selective ‘turn-on’ fluorescence probe. It can detect as low as 5 × 10−9 M H2AsO4− in HEPES buffered EtOH : water (0.1 M, 1 : 9, v/v, pH 7.4). Trace level H2AsO4− in drinking water samples is measured using standard addition method. Intracellular arsenate in Candida albicans, grown in arsenic contaminated water of Purbasthali has successfully been detected under fluorescence microscope.
萘-水杨醛共轭物(NAPSAL)是一种新型砷酸盐(H2AsO4−)选择性“开启”荧光探针。在HEPES缓冲乙醇水溶液(0.1 M,1:9,v/v,pH 7.4)中,它可以检测低至5×10-9 M H2AsO4−。饮用水样品中的痕量H2AsO4−使用标准添加法进行测量。在荧光显微镜下,成功检测了在Purbasthali砷污染水中生长的白色念珠菌的细胞内砷酸盐。