A new fluorene-based Schiff-base as fluorescent chemosensor for selective detection of Cr 3+ and Al 3+
摘要:
2-((9H-fluoren-2-ylimino) methyl)phenol (F3) was synthesized by condensation reaction of 9H-fluoren-2-amine and 2-hydroxybenzaldehyde in EtOH and characterized by its melting point, H-1-, C-13 NMR and molecular mass. F3 exhibits a high selectivity for detection of Cr3+ and Al3+ ions as a fluorescent chemosensor and showed a single emission band at 536 nm upon excitation at 333 nm according to fluorescence emission studies. The addition of Cr3+ and Al3+ make a significant increase in fluorescent intensity at 536 nm in CH3CN, while other metal ions have almost no influence on the fluorescence. The fluorescence enhancement was attributed to the inhibited C=N isomerization and the obstructed excited state intra-molecular proton transfer (ESIPT) of compound F3. Job's plot and DFT calculations data showed that the binding stoichiometries of F3 with Cr3+ and Al3+ are 2:1. The association constants (K-a) for Cr3+ and Al3+ were calculated and found to be 8.33 x 10(4) M-1 and 5.44 x 10(4) M-1, respectively. The detection limits were also calculated for Cr3+ and Al3+ and found to be 2.5 x 10(-7) mol/L and 3.1 x 10(-7) mol/L, respectively. (C) 2017 Published by Elsevier B.V.
Synthesis of Imines
<i>via</i>
Reactions of Benzyl Alcohol with Amines Using Half‐Sandwich (η
<sup>6</sup>
‐
<i>p</i>
‐cymene) Ruthenium(II) Complexes Stabilised by 2‐aminofluorene Derivatives
the complexes [Ru(η6‐p‐cymene)(Cl)(L2)], [Ru(η6‐p‐cymene)(Cl)(L3)] and [Ru(η6‐p‐cymene)(Cl)(L4)] revealed that the 2‐aminofluorene and p‐cymene moieties coordinate to ruthenium(II) in a three‐legged piano‐stool geometry. The synthesized complexes were used as catalysts for the dehydrogenative coupling of benzyl alcohol with a range of amines (aliphatic, aromatic and heterocyclic). The reactions were
一类新的半夹心的(η 6 - p -cymene)钌(II)配合物的2-氨基芴衍生物的[Ru(η支持6 - p -cymene)(CL)(L)](大号 = 2 - (( (9H-芴-2-基)亚氨基)甲基)苯酚(L 1),2-((((9H-芴-2-基)亚氨基)甲基)-3-甲氧基苯酚(L 2),1-((( 9H-芴-2-基)亚氨基)甲基)萘-2-醇(L 3)和N-((1H-吡咯-2-基)亚甲基)-9H-芴-2-胺(L 4))合成。所有化合物均通过分析和光谱技术(IR,UV-Vis,NMR)以及质谱进行了充分表征。的[Ru(η复合物的固态分子结构6 - p -cymene)(CL)(L 2)],[茹(η 6 - p -cymene)(CL)(L 3)]和[茹(η 6 ‐ p‐ cymene)(Cl)(L 4)]显示2-氨基芴和p苏木基部分以三足钢琴凳的几何形状与钌(II)配合。合成的络合物用作催
Selective fluorometric detection of F<sup>−</sup> and Zn(<scp>ii</scp>) ions by a N, O coordinating sensor and naked eye detection of Cu(<scp>ii</scp>) ions in mixed-aqueous solution
作者:Amar Hens、Kajal Krishna Rajak
DOI:10.1039/c5ra05145b
日期:——
A N, O coordinating sensor fluorogenically detects fluoride anions (λex = 330 nm, λem = 450 nm) with blue emission and Zn(ii) ions with green emission (λex = 405 nm, λem = 515 nm) as well as colorimetrically detecting copper ions.
Synthesis of <i>gem</i>-Difluorinated 2,3-Dihydrobenzofurans Using Freon-22 via [4 + 1] Annulation of Difluorocarbene and Antitumor Activity Evaluation
作者:Qianying Zhou、Mi Huang、Yongcun Shen、Zhenling Chen、Liying Xu、Zhigang Yang
DOI:10.1021/acs.orglett.4c00011
日期:2024.2.16
efficient assembly of valuable fluorinated 2,3-dihydrobenzofurans from the [4 + 1] annulation in good yields under basic conditions. The reliable practicability and scalability of the process have also been demonstrated by preparation at the multigram scale, late-stage modifications of pharmaceutical molecules, and potential antitumor potency.
Krasovitskii,B.M.; Nazarenko,A.I., Journal of Organic Chemistry USSR (English Translation), 1967, vol. 3, p. 150 - 156
作者:Krasovitskii,B.M.、Nazarenko,A.I.
DOI:——
日期:——
Synthesis and characterization of new ruthenium(III) complexes derived from fluoreneamine-based Schiff base ligands and their catalytic activity in transfer hydrogenation of ketones
Abstract An easy and convenient synthesis of a new series of octahedral ruthenium(III) complexes bearing Schiff base ligands of general formula [RuCl2(EPh3)2(L)] (where E = P, As and L = O,N-donor Schiff bases) has been reported. The composition of all complexes has been unequivocally characterized by spectral (IR, UV-vis, EPR) and ESI-MS techniques. The substituted Schiff base ligands behave as bidentate
摘要 一种带有通式 [RuCl2(EPh3)2(L)] 的 Schiff 碱配体的新系列八面体钌 (III) 配合物的简单方便的合成(其中 E = P, As 和 L = O,N-供体 Schiff基)已被报道。所有配合物的组成已通过光谱(IR、UV-vis、EPR)和 ESI-MS 技术明确表征。取代的席夫碱配体表现为双齿 O,N 供体,并通过酚氧、偶氮甲碱与钌配位。已证明配合物 1-6 可在 i-PrOH/KOH 存在下在 80°C 下催化直链、环状和芳香酮转移氢化为其相应的仲醇,转化率高达 99%。还报告了其他变量对转移氢化反应的影响,如溶剂、碱和催化剂负载。