Experimental and computational study of BODIPY dye-labeled cavitand dynamics

Area of Science:

• Supramolecular Chemistry
• Computational Chemistry
• Photophysics

Background:

• Resorcin[4]arene cavitands exhibit switchable conformations (kite and vase).
• Understanding guest-host interactions and molecular dynamics within these systems is crucial for applications.
• Borondipyrromethene (BODIPY) dyes are useful for probing molecular environments due to their photophysical properties.

Purpose of the Study:

• To investigate the distance distribution and dynamics of BODIPY dyes attached to resorcin[4]arene cavitands.
• To validate the use of molecular dynamics (MD) simulations in accurately representing these systems.
• To establish a foundation for studying fundamental distance-dependent interactions within molecular architectures.

Main Methods:

• Combined experimental techniques (fluorescence anisotropy, time-resolved Förster resonance energy transfer) and MD simulations.
• Labeling cavitands with donor/acceptor BODIPY dyes in both vase and kite forms.
• Comparing experimental anisotropy decays and fluorescence intensity decays with simulation-derived data.

Main Results:

• MD simulations showed excellent agreement with experimental fluorescence anisotropy data, confirming accurate dynamics representation.
• MD simulations and FRET experiments established precise distance distributions between BODIPY dyes.
• Emulated fluorescence intensity decay curves from MD trajectories matched experimental data, validating the simulation's accuracy.

Conclusions:

• MD simulations provide a reliable tool for accurately depicting the distance distributions and dynamics of BODIPY-labeled cavitands.
• This approach enables a deeper understanding of extended molecular systems.
• The validated simulation methodology can guide the design of future molecular systems and applications.