我们开发了带有两个芳基取代基的二氟化硼染料(BODIHYs)的化学性质,并探讨了它们的性质。低能量的吸收带(λ最大这些染料= 427-464纳米)依赖于附加到BODIHY框架的N-芳基基团的性质。给电子基团和扩展的π共轭基团引起红移,而吸电子基团导致蓝移。该标题化合物是在溶液中的光致发光弱和强的光致发光为薄膜(λ PL= 525–578 nm),量子产率高达18%,寿命为1.1–1.7 ns,这与通过荧光产生的主要辐射衰减一致。将水添加到所研究的BODIHY的THF溶液中会引起分子聚集,从而限制分子内运动,从而增强光致发光。相似的分子堆积效应可能促进了所观察到的BODIHY薄膜的光致发光。最后,循环伏安法研究证实,带有对位取代N-芳基的BODIHY衍生物可被可逆氧化(E ox1 = 0.62-1.02 V vs. Fc / Fc +)氧化成其自由基阳离子形式。化学氧化研究证实,对位需要N-
to yield diacetyl platinum(II) complexes [Pt(COMe)2(2-pyCRNNH2)] (R = H, 4a; Me, 4b; Ph, 4c) and [Pt(COMe)2(H2NNCMe–CMeNNH2)] (5). These complexes showed weak intramolecular N–H⋯O hydrogen bonds where the hydrazone and the acetyl ligand act as H donor and H acceptor, respectively. Using hydrazones 2-pyCRNNHR′ substituted with electron-withdrawing groups R′ resulted in complexes [Pt(COMe)2(2-pyCRNNHR′)]
双(苄胺)二乙酰铂(II)(3)与2-吡啶基官能化的和二乙酰二hydr反应生成二乙酰铂(II)配合物[Pt(COMe)2(2-pyCR NNH 2)](R = H,4a ; Me,4b ; Ph,4c)和[Pt(COMe)2(H 2 NN CMe–CMe NNH 2)](5)。这些配合物显示出较弱的分子内N–H⋯O氢键,其中and和乙酰基配体分别充当H供体和H受体。使用被吸电子基团R'取代的2- 2-pyCR NNHR'生成配合物[Pt(COMe)2(2- pyCR NNHR')](R / R'= H / C 6 H ^ 4 - p -F,6D ;我/ C 6 H ^ 4 - p -F,6E ; H /来,图7a ; ME /来,7b ; H / COPh,7c ; Me / COPh,7d ; H / CO(C 6 H 4 - p -F),7e ; Me / CO(C 6 H 4 - p
Bis(1-benzyl-4-aza-1-azoniabicyclo[2.2.2]octane) Peroxodisulfate: A Mild and Efficient Oxidant for Cleavage of Nitrogen Double Bonds and Oxidation of Alcohols under Anhydrous Conditions
Bis(1-benzyl-4-aza-1-azoniabicyclo[2.2.2]octane) peroxodisulfate (1), is readily prepared as an orange solid from commercially available 1,4-diazabicyclo[2.2.2]octane and potassium peroxodisulfate. This reagent easily converts hydrazones, semicarbazones, oximes, and alcohols to the corresponding carbonyl compounds with excellent yields.
Silica Sulfuric Acid/Wet SiO<sub>2</sub> as a Novel Heterogeneous System for Cleavage of Carbon Nitrogen Double Bonds Under Mild Conditions
作者:Mohammad Ali Zolfigol、Iraj Mohammad Poor-Baltork、Bibi Fatemeh Mirjalili、Farhad Shirini、Sadegh Salehzadeh、Hassan Keypour、Arash Ghorbani-Choghamarani、Mohammad Hassan Zebarjadian、Kamal Mohammadi、Azizeh Hazar
DOI:10.1080/714040985
日期:2003.12.1
Silica sulfuric acid in the presence of wet SiO2 was caused to react with oximes, hydrazones, semicarbazones, azines, and Schiff-bases. It was observed that it converts them to their corresponding carbonyl compounds in good to excellent yields under mild and heterogeneous conditions.
A series of mono-cationic half-sandwich rhodium(III) complexes have been synthesized in methanol using phenylhydrazone-derived ligands (L1–L6) and the starting precursor [(η5-C5Me5)2Rh2(μ-Cl)2Cl2] in a 2:1 molar ratio. The N,N′-phenylhydrazone complexes have been isolated as tetraphenylborate salts. All complexes were characterized by elemental analysis, FT-IR, UV–visible, NMR spectroscopy and mass
A transition‐metal‐free oxidativeCN coupling method has been developed for the synthesis of 1H‐azaindazoles and 1H‐indazoles from easily accessible hydrazones. The procedure uses TEMPO, a basic additive, and dioxygen gas as the terminal oxidant. This reaction demonstrates better reactivity, functional group tolerance, and broader scope than comparable metal catalyzed reactions.