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Multi-molecular emission of a cationic Pt(ii) complex through hydrogen bonding interactions
Kaho Yamaguchi1, Kazuma Yamawaki1, Takuya Kimura1
1Tsukuba Research Center for Energy Materials Science (TREMS), Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan. kuwabara@ims.tsukuba.ac.jp kanbara@ims.tsukuba.ac.jp.
Dalton Transactions (Cambridge, England : 2003)
|February 17, 2018
Summary
Platinum (Pt) complexes with amide groups exhibit dimer emission via hydrogen bonding. Moderate hydrogen bonding is key for effective multi-molecular emission, balancing ground-state interactions with excited-state dimer formation.
Area of Science:
- Supramolecular Chemistry
- Photophysics
- Coordination Chemistry
Background:
- Cationic platinum (Pt) complexes with amide groups can display dimer emission.
- Hydrogen bonding interactions with counter anions influence this emission, even at low concentrations.
Purpose of the Study:
- To investigate the role of hydrogen bonding strength in controlling dimer emission in Pt complexes.
- To understand the excited-state dynamics and ground-state interactions governing multi-molecular emission.
Main Methods:
- Preparation of three Pt complexes with counter anions of varying hydrogen bonding acceptor strengths (B(C6F5)4-, Cl-, PF6-).
- Evaluation using Nuclear Magnetic Resonance (NMR) analysis, temperature-dependent studies, and kinetic analysis of dimer emission.
Main Results:
- Ground-state hydrogen bonding is essential for dimer emission.
- Excessively strong hydrogen bonding inhibits stacked dimer formation in the excited state, thus preventing emission.
- Pt complexes with moderately hydrogen-bonding counter anions (PF6-) exhibited the most effective dimer emission.
Conclusions:
- A moderate hydrogen bonding interaction is optimal for achieving effective multi-molecular emission in Pt complexes.
- This finding contrasts with the general expectation that stronger supramolecular interactions lead to better assembled structures for multi-molecular emission.
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