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Luminescence color change of a platinum(II) complex solid upon mechanical grinding
Taichi Abe1, Toru Itakura, Noriaki Ikeda
1Department of Chemistry Graduate School of Integrated Sciences, Yokohama City University, 22-2 Seto, Yokohama, 236-0027, Japan.
Dalton Transactions (Cambridge, England : 2003)
|April 22, 2009
Summary
Grinding platinum complexes like Pt(5dpb)Cl alters their solid-state luminescence, shifting emission color and introducing new bands due to mechanochemical changes. This mechanochromism is linked to excimer-like formation, offering insights into solid-state material behavior.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Photophysics
Background:
- Solid-state luminescence is crucial for optoelectronic devices.
- Mechanochemical effects on luminescence are not fully understood.
- Platinum complexes are known for their interesting photophysical properties.
Purpose of the Study:
- To investigate the mechanochemical behavior of Pt(5dpb)Cl and Pt(dpb)Cl.
- To understand the relationship between mechanical stress and solid-state luminescence.
- To explore the nature of the emission changes upon grinding.
Main Methods:
- Solid-state luminescence spectroscopy (excitation and emission).
- Powder X-ray diffraction (XRD) for structural analysis.
- Time-resolved luminescence measurements.
Main Results:
- Crystalline Pt(5dpb)Cl (yellow luminescence) changed to orange upon grinding.
- A new broad emission band around 670 nm appeared in the ground Pt(5dpb)Cl powder.
- The ground Pt(5dpb)Cl retained its crystalline structure, while ground Pt(dpb)Cl became amorphous.
- The new emission band in Pt(5dpb)Cl showed temperature-dependent quenching, suggesting excimer-like behavior.
Conclusions:
- Pt(5dpb)Cl exhibits luminescent mechanochromism, transitioning from yellow to orange emission upon grinding.
- The observed phenomenon is attributed to mechanochemically induced excimer-like species formation.
- The structural integrity of the platinum complex influences the mechanochromic response and its temperature dependence.
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