Related Experiment Video
Updated: Jan 24, 2026
UV-Vis Spectroscopic Characterization of Nanomaterials in Aqueous Media
Published on: October 25, 2021
Metal ion interactions with methyl gallate characterized by UV spectroscopic and computational methods
Liangliang Zhang1, Yuchen Liu2, Xinyu Hu1
1Institute of Chemical Industry of Forest Products, CAF, Nanjing 210042, China; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210042, China.
Methyl gallate (MeG) forms complexes with metal ions, with the strongest binding observed for aluminum (Al3+). Complex formation is pH-dependent, and computational methods reveal insights into the electronic structure of these metal-MeG complexes.
Area of Science:
- Analytical Chemistry
- Computational Chemistry
- Biochemistry
Background:
- Methyl gallate (MeG) is a biologically active phenolic compound.
- Understanding metal-MeG interactions is crucial for various applications.
Purpose of the Study:
- To identify the nature of complexes formed between methyl gallate and Al3+, Fe3+, Cu2+, and Sn2+.
- To investigate the influence of pH on complex formation.
- To elucidate the electronic properties of these complexes using computational methods.
Main Methods:
- Ultraviolet (UV) spectroscopy was employed to analyze complex formation.
- Computational quantum-chemical methods, specifically density functional theory, were utilized.
- Electronic spectra were modeled with water as a solvent.
Main Results:
- Methyl gallate exhibited the highest formation constant with Al3+ among the studied metal ions.
- Complexation is a pH-dependent process.
- At pH 6.0, 1:1 complexes formed with Al3+, Fe3+, and Sn2+, while Cu2+ formed 2:3 complexes.
- Computational analysis indicated significant changes in electronic delocalization within the MeG-Al complex.
- Chelation of Al3+ was confirmed to occur at double-deprotonated phenolic hydroxyls.
Conclusions:
- The study successfully characterized methyl gallate complexes with several metal ions.
- Al3+ forms the most stable complex with methyl gallate.
- Computational modeling provides a reliable method for understanding the electronic structure and bonding in these complexes.
More Related Videos
11:04Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
Published on: September 7, 2019
10:13A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
Published on: April 28, 2023
Related Concept Videos
01:19The Role of Ion Channels in Neuronal Computation
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
02:32Bonding in Metals
02:51Metal-Ligand Bonds
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
03:45Formation of Complex Ions
03:11Precipitation of Ions
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
03:06Alkali Metals
Table 1: Properties of the alkali metals