Nutation Spectroscopy of a Weakly Interacting Heterobimetallic Spin System

Area of Science:

• Coordination Chemistry
• Magnetochemistry
• Spectroscopy

Background:

• Designing molecular magnetic materials requires precise control over spin interactions.
• Porphyrin-based complexes offer versatile platforms for constructing sophisticated spin systems.

Purpose of the Study:

• To investigate the magnetic properties of weakly coupled, dissymmetric spin systems incorporating V^IV and Cu^II ions.
• To synthesize and characterize porphyrin-based dimers linked by a Pd^II ion.

Main Methods:

• Continuous-wave (CW) and pulsed Electron Paramagnetic Resonance (EPR) spectroscopy.
• Field-Swept Echo-Detected (FSED) EPR.
• Spin nutation experiments.

Main Results:

• Characterization of mononuclear V^IVO and Cu^II precursors.
• Observation of enhanced spectral broadening in the heterometallic (VO)PdCu dimer due to dissimilar spin interactions.
• Identification of distinct spin transitions in (VO)PdCu via spin nutation, despite spectral overlap.
• Retention of spin coherence above liquid nitrogen temperatures, up to 295 K for some complexes.

Conclusions:

• The study successfully demonstrates the design of weakly coupled, dissymmetric spin systems using V^IV and Cu^II in porphyrin dimers.
• EPR spectroscopy effectively probes interspin interactions and spin dynamics in these complex systems.
• The observed high-temperature coherence is promising for potential applications in quantum technologies.