at the same time, blue-shifted of fluorescence emission wavelength was observed when the C-5 position of 8-hydroxyquinoline was substituted by electron-withdrawing group. When the C-4 position of 8-hydroxyquinolie was substituted by methyl or the C-5 position was substituted by sulfonic acid group, the corresponding zinc complexes had higher fluorescence intensity than 8-hydroxyquinolie zinc.
(HL3) is polycrystalline nature. The proton-ligand dissociation constant of the azo compounds (HLn) and metal–ligandstabilityconstants of their complexes with metalions (Mn2 +, Co2 +, Ni2 + and Cu2 +) have been determined by potentiometric technique in 0.1 M KCl and 50% (by volume) DMF–water mixture. For the same ligand at constant temperature, the stabilityconstants of the formed complexes increase
Ligational behavior of bidentate nitrogen–oxygen donor 8‐quinolinolazodye toward Ni
<sup>2+</sup>
and Zn
<sup>2+</sup>
ions: Preparation, spectral, thermal, experimental, theoretical, and docking studies
作者:Mohamed G. Abd El‐Nasser、Samir A. Abdel‐Latif
DOI:10.1002/aoc.6998
日期:2023.3
transform infrared (FT-IR), proton nuclear magnetic resonance (1H NMR), molar conductance, magnetic measurements, thermal gravimetric and differential thermal analyses (TG and DTA), and electronic transition. The FT-IRspectra showed that the ligands are coordinated to the metal ions in a bidentate manner with donor sites of the azomethine-N and phenolic-OH. The FT-IR and UV–Visible spectra were compared
Ten mixed ligand complexes of the type [M(X-QA)(aa)] and [Ni(X-QA)(2)(Haa)(H2O)], where X-HQA=5-arylazo-8-hydroxyquinoline derivatives, M=Co(II) or Cu(II) and Haa=glycine (gly), alanine (ala) or methionine (met), have been prepared. The complexes have been characterized by elemental analysis, IR and electron spectra and thermal analysis. A tetrahedral structure has been proposed for the cobalt(II) and copper(II) complexes with bidentate coordination of amino acids. The nickel(II) complexes have been assigned an octahedral structure with the amino acids acting as monodentate ligands. The thermal behaviour of the complexes has been studied before and after gamma -irradiation.
Studies in Azo Dyes. II. Preparation and Bacteriostatic Properties of Azo Derivatives of 8-Quinolinol<sup>1a,b,c</sup>