![Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F51444.jpg&w=3840&q=50)
Strongly luminescent palladium(0) and platinum(0) diphosphine complexes
Taro Tsubomura1, Yasuhiro Ito, Satoshi Inoue
1Department of Materials and Life Science, Seikei University, Kichijoji-Kitamachi, Musashino, Tokyo 180-8633, Japan. tsubomura@st.seikei@ac.jp
Inorganic Chemistry
|December 15, 2007
Summary
This study investigated palladium and platinum complexes with biarydiphosphine ligands, finding that [Pd(biphep)(2)] exhibits strong luminescence due to metal-to-ligand charge transfer, with potential applications in optoelectronics.
Area of Science:
- Organometallic Chemistry
- Photochemistry
- Materials Science
Background:
- Biarydiphosphine ligands like biphep and binap are crucial in coordination chemistry.
- Palladium(0) and platinum(0) complexes are of interest for their photophysical properties.
Purpose of the Study:
- To synthesize and characterize palladium(0) and platinum(0) complexes with biphep and binap ligands.
- To investigate and compare the photoluminescence properties of these metal complexes.
- To understand the factors influencing luminescence, such as excited states and rate constants.
Main Methods:
- Synthesis of palladium(0) and platinum(0) complexes.
- X-ray structure analysis to determine molecular geometry.
- Photoluminescence spectroscopy to measure quantum yield, lifetime, and radiative/nonradiative rate constants.
- Temperature-dependent studies of luminescence.
Main Results:
- The distorted-tetrahedral geometry of [Pt(biphep)(2)] was confirmed by X-ray analysis.
- [Pd(biphep)(2)] displayed the strongest luminescence, with a 38% quantum yield and 3.2 µs lifetime.
- Luminescence is attributed to metal-to-ligand charge transfer excited states.
- Differences in luminescence efficiency are linked to nonradiative decay rates.
Conclusions:
- The photophysical properties of palladium and platinum complexes with biarydiphosphines are tunable.
- [Pd(biphep)(2)] shows promising luminescence characteristics for potential applications.
- Nonradiative decay pathways significantly impact the overall luminescence efficiency of these complexes.
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