Related Experiment Video
Updated: Sep 14, 2025

Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
Published on: July 4, 2016
Detecting Coordination-Induced Spin-State Switching in Coumarin-Tagged Nickel(II) Complexes via the Fluorescence
Shufang Xue1, Tengli Wang1, Jintao Zhu1
1Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China.
This study introduces a coumarin-Ni(II) complex as a fluorescent probe to quantify coordination-induced spin-state switching (CISSS). The probe uses fluorescence quenching to detect spin-state changes in nickel(II) complexes, enabling molecular sensing.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Spin-state switching in metal complexes is crucial for molecular devices.
- Fluorescence quenching is a sensitive detection method.
- Developing probes for spin-state transitions is an active research area.
Purpose of the Study:
- To develop a coumarin-functionalized Ni(II) complex as a fluorescent probe.
- To quantify coordination-induced spin-state switching (CISSS) behavior.
- To investigate the mechanism of fluorescence quenching in Ni(II) complexes.
Main Methods:
- Synthesis of a coumarin-functionalized Ni(II) complex.
- Fluorescence spectroscopy to monitor spin-state transitions.
- Deconvolution of quenching contributions using theoretical models.
Main Results:
- The Ni(II) complex acts as a fluorescent probe for CISSS via fluorescence quenching.
- Static quenching mechanisms, including CISSS quenching, dominate.
- Distinct photoinduced electron transfer rates were observed for diamagnetic and paramagnetic states.
Conclusions:
- Fluorescence quenching can visually monitor CISSS behavior in coordination complexes.
- This approach offers new insights into spin-state-responsive molecular sensing.
- The developed probe demonstrates the potential for advanced molecular sensing applications.
More Related Videos
12:57Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
07:24Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
Published on: September 23, 2021
Related Concept Videos
Colors 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...
Valence Bond Theory
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...
Atomic Nuclei: Nuclear Spin State Overview
Spin–Spin Coupling: One-Bond Coupling