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Excited triplet state zero-field splitting in a ligand-to-ligand charge transfer complex
Joshua Mengell1, Shiyue Gao1, Caroline Mangione1
1Department of Chemistry and Chemical Biology, The University of New Mexico, MSC03 2060, 1 University of New Mexico, Albuquerque, New Mexico 87131-0001, USA.
Magneto-photoluminescence experiments reveal spin dynamics in a platinum complex. Applied magnetic fields and temperature influence excited states, enabling measurement of zero-field splitting crucial for understanding electron spin polarization in related materials.
Area of Science:
- Photochemistry
- Solid-state physics
- Inorganic chemistry
Background:
- Ligand-to-ligand charge transfer (LL'CT) complexes are vital in photochemistry.
- Understanding excited triplet states (T1) is key to controlling photophysical properties.
- Platinum(II) complexes offer unique spin-orbit coupling effects.
Purpose of the Study:
- To investigate the excited triplet state (T1) of a (qdt)Pt(dbbpy) complex using magneto-photoluminescence.
- To determine the zero-field splitting (ZFS) parameter (D) of the T1 state.
- To provide insights into electron spin polarization mechanisms in related radical-elaborated complexes.
Main Methods:
- Solid-state variable-temperature, variable-field magneto-photoluminescence spectroscopy.
- Analysis of temperature and magnetic field dependence of photoluminescence (PL) spectra.
- Assessment of spin-lattice relaxation (T1) and axial ZFS parameter (D).
Main Results:
- Observed strong temperature and magnetic field dependence of PL spectra.
- Determined a zero-field splitting (ZFS) of -2.9 ± 0.7 cm⁻¹ for the T1 state, attributed to Pt(II) spin-orbit coupling.
- Accelerated spin-lattice relaxation (T1) due to ZFS and magnetic field.
Conclusions:
- The ZFS in the T1 state of (qdt)Pt(dbbpy) is quantified, confirming the role of spin-orbit coupling.
- This study provides essential data for estimating ZFS in related radical complexes.
- Understanding these spin dynamics is crucial for controlling electron spin polarization in advanced materials.
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