Related Experiment Video
Updated: May 4, 2026
12:52
IridiumIII Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II
Published on: July 7, 2015
9.1K
Mesogenic L-histidine Based Schiff Base and its Zn(II) Complex: Synthesis, Photophysical Properties, AIE and TD-DFT
Hunshisha Pyngrope1, Jagritima Chetia1, Bandashisha Kharpan1
1Department of Chemistry, Assam University, Silchar, 788011, Assam, India.
Journal of Fluorescence
|April 11, 2025
Summary
Researchers synthesized a novel zinc(II) complex with a photoluminescent Schiff base ligand derived from L-histidine. The complex exhibits blue fluorescence and potential semiconducting properties, with potential applications in materials science.
Area of Science:
- Coordination Chemistry
- Materials Science
- Photophysics
Background:
- Schiff base ligands are versatile building blocks in coordination chemistry.
- L-histidine is a biologically relevant amino acid with potential for functionalization.
- Photoluminescent materials are crucial for optoelectronic applications.
Purpose of the Study:
- To synthesize and characterize a novel Schiff base ligand and its zinc(II) complex.
- To investigate the photophysical and mesomorphic properties of the synthesized compounds.
- To explore the potential semiconducting behavior and aggregation-induced emission (AIE) of the zinc(II) complex.
Main Methods:
- Synthesis and characterization using analytical techniques.
- Mesomorphic property analysis.
- UV-Vis and emission spectroscopy in varying solvent polarities.
- Optical spectroscopy for AIE studies.
- Density Functional Theory (DFT) and Time-Dependent DFT (TD-DFT) calculations.
Main Results:
- A new photoluminescent Schiff base ligand and its zinc(II) complex were successfully synthesized and characterized.
- The ligand displayed nematic liquid crystalline properties, while the complex showed enhanced blue fluorescence.
- The zinc(II) complex exhibited aggregation-induced emission (AIE) properties.
- Optical band gaps suggest semiconducting behavior for both compounds.
- Theoretical calculations supported the experimental photophysical properties.
Conclusions:
- The synthesized zinc(II) complex is a promising photoluminescent material with AIE characteristics.
- The compounds possess optical band gaps indicative of semiconducting materials.
- The study provides insights into the structure-property relationships of Schiff base metal complexes for potential applications.
More Related Videos
Related Concept Videos
02:51Metal-Ligand Bonds
19.3K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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...
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...
19.3K
02:42Valence Bond Theory
8.9K
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...
8.9K
03:02Colors and Magnetism
12.1K
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...
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...
12.1K
01:25Basicity of Heterocyclic Aromatic Amines
5.9K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
5.9K
01:07Ladder Diagrams: Complexation Equilibria
736
Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
736
01:26EDTA: Auxiliary Complexing Reagents
1.6K
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
1.6K