Related Experiment Video
Updated: May 23, 2026

Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
Published on: February 7, 2022
A long-lived photo-induced metastable state of linkage isomerization accompanied with a spin transition
Chou-Fu Sheu1, Che-Hsiu Shih, Kunihisa Sugimoto
1Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan, ROC.
Abstract:
In addition to the generally observed LIESST phenomenon, polymorph D of trans-[Fe(II)(abpt)(2)(NCS)(2)] exhibits a long-lived photo-induced metastable state through linkage isomerization accompanied with a spin crossover transition, which is stable up to 108 K.
Related Concept Videos
Deactivation Processes: Jablonski Diagram
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Atomic Nuclei: Nuclear Spin State Overview
Atomic Nuclei: Nuclear Relaxation Processes
NMR Spectroscopy: Spin–Spin Coupling
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...

