Some new metal(II) dichloride complexes with the ligands substituted nitrones of the
general formula [ML2Cl2], where M= Co(II), Ni(II), Cu(II), Zn(II) and Cd(II),
L=OCH=CHCH=C-CH=N(O)C6H4X (X=H,p-CH3,CH3O,CH3CO,F,Cl,and Br) have
been prepared and characterized by elemental analysis, IR,1H,13C NMR and Vis/Uv
spectroscopy. The IR spectral data showed that the nitrone ligands coordinated with
the metal ion through the most active atom of the N-oxide to give square planner
coordinate (Cu,Ni,) complexes and (Zn,Cd,Co) tetrahedral complexes. No correlation
was observed between the N-O vibrations stretching hing frequency ν(N-O) of the
complexes and the Hammet (σ) constants.
Inhaltsverzeichnis (Table of Contents)
- Abstract
- Introduction
- EXPERIMENTAL
- Results and Discussion
Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)
This research investigates the formation and properties of metal(II) dichloride complexes with substituted nitrones. The study aims to characterize these complexes and examine the influence of substituents on their formation and properties. The objective is to gain a deeper understanding of the coordination behavior of nitrones with metal ions, as well as the impact of electronic effects on the coordination process.
- Synthesis and characterization of metal(II) dichloride complexes with substituted nitrones
- Coordination behavior of nitrones with metal ions
- Influence of substituents on complex formation and properties
- Analysis of complex structures using IR, NMR, and UV/Vis spectroscopy
- Application of Hammett equation to explore the correlation between electronic effects and complex formation
Zusammenfassung der Kapitel (Chapter Summaries)
Abstract
: This section provides a concise overview of the study, outlining the synthesized complexes, their general formula, and the employed characterization techniques. The coordination mode of the nitrones and the lack of correlation between N-O stretching frequency and Hammett constants are highlighted.Introduction
: The introduction delves into the significance of nitrone compounds and their derivatives, emphasizing their biological importance. It discusses the importance of developing new synthetic methods for nitrones, particularly for creating complexes with potential biological activity. The text highlights the role of microwave chemistry and metal coordination in enhancing reactivity and the resonance structures of nitrones, emphasizing the potential of these compounds as electron-withdrawing or donating groups. The research aims to explore the interaction between metal chlorides and N-arylfurfuralnitrones, examining the effect of substituents on complex formation using the Hammett equation.EXPERIMENTAL
: This section details the experimental procedures used in the study. It covers the preparation of the N-arylfurfuralnitrones ligands, the synthesis of the metal complexes, and the analytical techniques employed for characterization. The specific methods used for metal analysis, NMR, IR, conductivity, and UV-Vis spectroscopy are described.Results and Discussion
: This section presents and discusses the findings of the study. It analyzes the IR, NMR, and UV-Vis spectral data to elucidate the coordination mode of the nitrones and the structure of the complexes. The section examines the impact of substituents on complex formation and the implications of the observed trends. The magnetic properties of the complexes are discussed, and the proposed structures for different metal complexes are presented. The study concludes with an investigation of the correlation between N-O stretching frequency and Hammett constants, revealing the potential influence of electronic effects on the reaction mechanism.
Schlüsselwörter (Keywords)
This study focuses on the coordination chemistry of N-arylfurfuralnitrones with metal ions, particularly Co(II), Ni(II), Cu(II), Zn(II), and Cd(II). Key themes include the synthesis and characterization of metal complexes, the impact of substituents on complex formation, and the use of IR, NMR, and UV-Vis spectroscopy to elucidate complex structures and properties. The Hammett equation is employed to examine the influence of electronic effects on the reaction mechanism. Other important concepts include the coordination behavior of nitrones, square-planar and tetrahedral complex geometries, and the relationship between magnetic properties and coordination environment.
- Quote paper
- Amer Taqa (Author), 2011, Some Complexes of N-Aryl Furfural Nitrones with Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) Chlorides, Munich, GRIN Verlag, https://www.hausarbeiten.de/document/209690
