Computational studies on response and binding selectivity of fluorescence sensors
George A Hudson1, Lei Cheng, Jiamei Yu
1Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, Illinois 62901, USA.
The Journal of Physical Chemistry. B
|December 31, 2009
Summary
We developed a computational protocol for designing Photoinduced Electron Transfer (PET) fluorescence sensors. This method efficiently predicts sensor performance for detecting zinc ions (Zn2+), even with calcium present.
Area of Science:
- Computational Chemistry
- Sensor Design
- Spectroscopy
Background:
- Photoinduced Electron Transfer (PET) sensors are crucial for detecting metal ions.
- Previous work demonstrated a computational strategy for Zn(2+) sensor design.
Purpose of the Study:
- To further investigate and refine the computational design protocol for PET fluorescence sensors.
- To design and validate a new PET fluorescence sensor for Zn(2+) ions.
Main Methods:
- Density Functional Theory (DFT) calculations, including B3LYP and time-dependent B3LYP.
- Utilized multiple basis sets (e.g., 6-31G(d,p)) to assess molecular orbital energies.
- Computational design of a sensor comprising anthracene (fluorophore), pyridine (receptor), and dimethylethanamine (linker).
Main Results:
- Calculated Highest Occupied Molecular Orbital (HOMO) and Lowest Unoccupied Molecular Orbital (LUMO) energies were consistent across different basis sets.
- Relative molecular orbital energy levels remained unchanged upon linking the fluorophore and receptor.
- The computational protocol allows for separate calculation of component MO energies, simplifying sensor design.
- Binding selectivity studies predicted effective Zn(2+) detection in the presence of Ca(2+).
Conclusions:
- The computational design protocol is effective for developing PET fluorescence sensors.
- The chosen basis sets do not significantly impact the relative MO energy level calculations.
- Sensor components can be analyzed independently, streamlining the computational design process.
- The designed sensor shows promising selectivity for Zn(2+) over Ca(2+).
