Related Experiment Video
Updated: Sep 9, 2025
High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
Published on: October 31, 2019
Modulating supramolecular Pt⋯Pt interactions and π-π stacking for high-contrast mechanochromic and vapochromic
Xianchao Du1, Xiang Liu1,2, Qianyun Liu1
1College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang, Henan 473061, P. R. China. xianchaodu@163.com.
None:
A platinum(II) complex (Pt-PF) with bis(imidazolyl)pyridine ligands was synthesized, and its photophysical properties were comprehensively characterized. Two distinct forms of Pt-PF (Y-Pt-PF and R-Pt-PF) exhibiting different colors and structural arrangements were identified. Modulated supramolecular Pt⋯Pt interactions and π-π stacking patterns make the yellow Y-Pt-PF to red R-Pt-PF transformation occur under mechanical grinding or exposure to CH3CN or MeOH vapors demonstrating high-contrast mechanochromic and vapochromic properties.
Related Concept Videos
01:27π Electron Effects on Chemical Shift: Overview
02:58Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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...