A series of benzothiazole-based Schiff bases for the colorimetric sensing of fluoride and acetate ions: acetate-induced turn-on fluorescence for selectivity
作者:Nilotpal Borah、Sagnik De、Abhijit Gogoi、Gopal Das
DOI:10.1039/d0nj03516e
日期:——
shift. Selectivity between the two anions are accomplished by using emission spectroscopy as another Schiff base L3, with its dimeric cage like structure, can selectively sense acetate ion based on its shape complementarity emitting turn-onfluorescence at 520 nm in presence of the aforementioned ion. L2 exhibits the lowest detection limit for fluoride ions with a limit of detection as low as 3.35x10-8
合成了三种苯并噻唑官能化的席夫碱,并将其用作比色传感器,用于乙腈中的氟离子和乙酸根离子。通过在L2中引入香豆素部分,增强了基于吸收光谱的L1的感知能力,[(E)-1-((2-(苯并[d]噻唑-2-基)肼基亚甲基)甲基)萘-2-醇] [(E)-3-(((2-(苯并[d]噻唑-2-基)肼基亚甲基)甲基)-4-氯-2H-铬-2-基]。通过明显的颜色变化和147 nm的红移,可以通过肉眼快速检测氟离子和乙酸根离子,从而使L2优于L1。两种阴离子之间的选择性是通过使用发射光谱法实现的,因为另一个Schiff碱L3具有二聚体笼状结构,可以根据其形状互补性选择性地感测乙酸根离子,并在存在上述离子的情况下在520 nm处发射开启荧光。L2展示出最低的氟离子检测限,通过比色响应检测限低至3.35x10-8 M,而L3通过开启的荧光信号检测到低至2.907x10-8 M的乙酸根离子。1 H NMR研究证实,其
Supramolecular solid-state structure, potential energy surfaces and evaluation of antiproliferative effect of 2-benzothiazolylhydrazone derivatives in vitro
6-methoxy-2-naphthaldehyde produced 9 hydrazone Schiff bases (L1–L9, respectively) which were identified and characterized by elemental analysis, IR and NMR spectroscopy. The crystal and molecular structures of four Schiff bases (L1, L7–L9) have been determined by the single-crystal X-ray diffraction method confirming the imino form of L1 and the amino tautomeric form of L7–L9 compounds. Molecular structure analysis
2-肼基苯并噻唑与水杨醛、3,4-二羟基苯甲醛、2,4-二羟基苯甲醛、2,5-二羟基苯甲醛、2,3-二羟基苯甲醛、2-羟基-1-萘甲醛、2-甲氧基-1-的原位缩合反应萘醛、4-甲氧基-1-萘醛和6-甲氧基-2-萘醛产生9 种腙席夫碱(分别为L1-L9),通过元素分析、IR 和NMR 光谱对其进行鉴定和表征。四种席夫碱(L1、L7-L9)的晶体和分子结构已通过单晶 X 射线衍射法确定,证实了 L1 的亚氨基形式和 L7-L9 化合物的氨基互变异构形式。分子结构分析还证实,报告的化合物是 E 异构体,相对于 exo C = N 亚氨基键。氨基互变异构体的Nhydrazino-H基团形成Nhydrazino-H···Nthiazolyl分子间氢键使分子形成R22(8)环,而L1的亚氨基互变异构体通过Nthiazolyl-H···Nhydrazino型形成C(4)无限螺旋链分子间氢键。甲氧基(L7
New half-sandwich (η6-p-cymene)ruthenium(II) complexes with benzothiazole hydrazone Schiff base ligand: Synthesis, structural characterization and catalysis in transamidation of carboxamide with primary amines
techniques (IR, NMR) and also by mass spectrometry. The solid state structure of the complex 3 reveals the coordination of p-cymene moieties with ruthenium(II) in a three-legged piano-stool geometry along with benzothiazole hydrazone Schiff base ligand in a monobasic bidentate fashion. The catalytic properties of the complexes were screened in transamidation of primary amide with amines after optimization