Related Experiment Video
Updated: Jun 16, 2026
14:11
Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
Published on: June 10, 2021
Novel Fe (III) heterochelates: synthesis, structural features and fluorescence studies
C K Modi1, D H Jani, H S Patel
1Department of Chemistry, Bhavnagar University, Old Campus, Bhavnagar 364 002, Gujarat, India. chetank.modi1@gmail.com
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|February 6, 2010
Summary
This study investigated the fluorescence of novel iron(III) heterochelates. Chelation with pyrazolone hydrazides and a fluoroquinolone ligand caused a red shift in fluorescence, indicating altered electronic properties.
Area of Science:
- Coordination Chemistry
- Materials Science
- Spectroscopy
Background:
- Pyrazolone derivatives are versatile ligands in coordination chemistry.
- Iron(III) heterochelates offer potential applications in various fields.
- Understanding fluorescence properties is crucial for material design.
Purpose of the Study:
- To synthesize and characterize five novel iron(III) heterochelates.
- To investigate the fluorescence properties of these complexes and their parent ligands.
- To analyze the effect of metal chelation on spectral characteristics and kinetic parameters.
Main Methods:
- Synthesis of 4-acyl pyrazolone based hydrazides (H(2)SB(n)) and their iron(III) heterochelates.
- Room temperature fluorescence spectroscopy to study spectral shifts.
- Calculation of kinetic parameters (order of reaction, activation energy, entropy, etc.).
Main Results:
- The synthesized iron(III) heterochelates exhibited red-shifted fluorescence spectra compared to ligands.
- Chelation to the iron(III) ion was proposed as the cause for the observed red shift.
- Kinetic parameters including activation energy and Gibbs free energy were determined.
Conclusions:
- Metal-ligand chelation significantly influences the electronic transitions and fluorescence behavior.
- The study provides insights into the structure-property relationships of iron(III) heterochelates.
- These findings contribute to the development of novel fluorescent materials.
Related Concept Videos
01:26Variables Affecting Phosphorescence and Fluorescence
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
02:34Structural Isomerism
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
01:14Photoluminescence: Applications
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.