Related Experiment Video
Updated: May 25, 2026
Iridium(III) Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II
Published on: July 7, 2015
Reversible piezochromic behavior of two new cationic iridium(III) complexes
Guo-Gang Shan1, Hai-Bin Li, Hong-Tao Cao
1Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, 130024 Jilin, People's Republic of China.
Two new iridium(III) complexes show unique piezochromism, changing emission color when ground or heated. This marks the first instance of iridium(III) complexes exhibiting piezochromic phosphorescence.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Photochemistry
Background:
- Piezochromism is a phenomenon where materials change color under mechanical stress.
- Iridium(III) complexes are known for their phosphorescent properties, widely used in lighting and sensing.
- Developing stimuli-responsive materials is crucial for advanced applications.
Purpose of the Study:
- To synthesize and characterize novel cationic iridium(III) complexes.
- To investigate the piezochromic and thermochromic properties of these complexes.
- To explore the potential of these complexes in stimuli-responsive luminescence.
Main Methods:
- Synthesis of two new cationic iridium(III) complexes.
- Spectroscopic analysis (absorption, emission) under mechanical stress (grinding) and thermal treatment.
- Structural characterization of the complexes.
Main Results:
- The synthesized iridium(III) complexes exhibit distinct piezochromism, with color changes observed upon grinding.
- The emission color of the complexes can be reversibly switched by heating and cooling cycles.
- This study presents the first report of piezochromic phosphorescence in iridium(III) complexes.
Conclusions:
- Novel cationic iridium(III) complexes with tunable luminescence properties have been developed.
- These complexes demonstrate significant potential for applications in pressure sensors and smart displays.
- The findings open new avenues for designing mechanochromic luminescent materials.
More Related Videos
07:11ARL Spectral Fitting as an Application to Augment Spectral Data via Franck-Condon Lineshape Analysis and Color Analysis
Published on: August 19, 2021
09:45Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
Related Concept Videos
03:02Colors and Magnetism
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.
02:52Stereoisomerism
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...
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
01:26Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
02:34Structural Isomerism
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...
01:17Pericyclic Reactions: Introduction
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic rearrangements are...