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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
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Solvent- and Temperature-Responsive Platinum(II)-Functionalized Flexible Lewis Pairs.
Nicole E Arsenault1, Zhen Xu1, Michael O Wolf1
1Department of Chemistry , University of British Columbia , 2036 Main Mall , Vancouver , British Columbia V6T 1Z1 , Canada.
Inorganic Chemistry
|December 15, 2018
Summary
New metal-functionalized flexible Lewis pair (flexLP) complexes offer tunable photophysical properties. These platinum-tpy complexes switch between open and closed states in response to solvents and temperature, altering charge-transfer energies.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Flexible Lewis pair (flexLP) ligands offer unique structural and electronic properties.
- Metal-functionalization of flexLPs can introduce novel functionalities.
- Platinum(II) terpyridine (Pt-tpy) units are known for their photophysical characteristics.
Purpose of the Study:
- To synthesize and characterize metal-functionalized flexible Lewis pair (flexLP) complexes.
- To investigate the stimuli-responsive behavior of these complexes.
- To explore the tunability of their photophysical properties.
Main Methods:
- Copper(I)-catalyzed coupling reactions for complex synthesis.
- Nuclear Magnetic Resonance (NMR) spectroscopy for structural analysis.
- UV-vis absorption spectroscopy to study electronic transitions and complex behavior.
Main Results:
- Successful synthesis of monometallic and bimetallic Pt-tpy flexLP complexes.
- Demonstrated switching between open unbound and closed Lewis adduct forms.
- Complexes exhibit sensitivity to solvent hydrogen-bond-donating (HBD) strength and temperature.
- Charge-transfer (CT) energies are tunable by controlling the open/closed equilibrium.
Conclusions:
- Pt-tpy flexLP complexes exhibit stimuli-responsive behavior.
- The equilibrium between open and closed forms allows for tuning of photophysical properties.
- This work demonstrates the potential of stimuli-responsive flexLP ligands for controlling metal complex behavior.
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