Related Experiment Video
Updated: Jul 29, 2025
10:21
Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
8.4K
Photochromic Supramolecular Isomers Derived from Pb(II)-Bipyridinedicarboxylate Complexes
Zhen-Gang Liang1, Gang-Mei Li1, Xin-Ye Ren1
1College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, Shandong 266071, P.R. China.
Inorganic Chemistry
|May 24, 2023
Summary
Chemists created two isomeric photochromic metal-organic complexes (PMOCs) using a novel pyridinecarboxylic acid ligand. These PMOCs show distinct photochromic behaviors, enabling applications in encryption and anti-counterfeiting technologies.
Area of Science:
- Materials Science
- Coordination Chemistry
- Supramolecular Chemistry
Background:
- Photochromic metal-organic complexes (PMOCs) are extensively researched for their tunable photo-responsive properties.
- The design of organic ligands is critical for achieving specific functionalities in PMOCs.
- Polydentate ligands offer opportunities for creating isomeric metal-organic complexes (MOCs) with unique characteristics.
Purpose of the Study:
- To synthesize novel photochromic metal-organic complexes (PMOCs) using pyridinecarboxylic acid ligands.
- To investigate the formation of isomeric MOCs and their distinct photochromic properties.
- To explore potential applications of these isomeric MOCs in schematic encryption and anti-counterfeiting devices.
Main Methods:
- Coordination assembly of 2,2'-bipyridine-4,4'-dicarboxylic acid (H2bpdc) with Pb2+ ions.
- Characterization of the resulting isomeric MOCs ([Pb(bpdc)]·H2O, complexes 1 and 2).
- Evaluation of the photochromic performance of the synthesized supramolecular isomers.
Main Results:
- Two isomeric MOCs, [Pb(bpdc)]·H2O (1 and 2), were successfully synthesized.
- The isomers exhibit different photochromic behaviors due to variations in the coordination modes of the bpdc2- ligand.
- The distinct photochromic properties were leveraged to demonstrate a schematic encryption and anti-counterfeiting device.
Conclusions:
- Pyridinecarboxylic acid ligands provide a novel approach for constructing PMOCs with tunable photochromic functionalities.
- The formation of isomeric MOCs offers new avenues for designing advanced photo-responsive materials.
- The developed PMOCs show promise for practical applications in security and data storage.
More Related Videos
![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
Related Concept Videos
02:52Stereoisomerism
12.2K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
12.2K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.9K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.9K
02:34Structural Isomerism
19.5K
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...
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...
19.5K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.4K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.4K
03:02Colors and Magnetism
12.0K
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...
12.0K
01:34Woodward–Hoffmann Selection Rules and Microscopic Reversibility
3.2K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
3.2K