Emission from CT State and J-aggregates in a Model Coumarin-Paraben Conjugate: A Spectroscopic Study

Area of Science:

• Organic synthesis and photophysics
• Fluorescent probe development
• Biomedical imaging applications

Background:

• Designing novel fluorophores is crucial for advanced optical applications.
• Coumarin derivatives are widely explored for their photophysical properties.
• Developing cell-permeable fluorescent probes for biological research is an active area.

Purpose of the Study:

• To synthesize and characterize a coumarin-based probe (CP).
• To investigate the photophysical behavior of CP in solution and solid-state.
• To evaluate the utility of CP as a cell-imaging agent for human peripheral blood mononuclear cells (PBMC).

Main Methods:

• Synthesis of coumarin-based probe (CP).
• Spectroscopic analysis (UV-Vis absorption and fluorescence emission) in solution and solid-state.
• Cell imaging experiments using human peripheral blood mononuclear cells (PBMC).
• Molecular dynamics simulations to probe binding interactions.

Main Results:

• CP exhibits emission from monomers and J-aggregates in solution, and H- and J-aggregates along with monomers in the solid-state.
• CP demonstrates good emission properties in aqueous solutions at pH 7.0, suitable for biological conditions.
• CP successfully images human peripheral blood mononuclear cells (PBMC), showing distinct green and red emissions.
• Molecular dynamics simulations provided insights into the binding of CP to PBMC cells.

Conclusions:

• The synthesized coumarin-based probe (CP) possesses favorable photophysical properties for optical applications.
• CP is effective as a cell-imaging agent for human peripheral blood mononuclear cells (PBMC).
• The study highlights the potential of CP in fluorescence microscopy and biomedical research.