Related Experiment Video
Updated: Mar 16, 2026
07:49
Conventional BODIPY Conjugates for Live-Cell Super-Resolution Microscopy and Single-Molecule Tracking
Published on: June 8, 2020
8.8K
Solvent-Driven Conformational Exchange for Amide-Linked Bichromophoric BODIPY Derivatives
Shrikant Thakare1, Patrycja Stachelek2, Soumyaditya Mula3
1Department of Dyestuff Technology, Institute of Chemical Technology, Mumbai, 400019, India.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 17, 2016
Summary
Solvent polarity unexpectedly affects fluorescence in BODIPY-phenanthroline molecules. Molecular modeling reveals conformational changes influence light-induced charge transfer, explaining observed quenching behaviors.
Area of Science:
- Supramolecular Chemistry
- Photophysics
- Organic Electronics
Background:
- Boron dipyrromethene (BODIPY) dyes are widely used in various optical applications.
- Phenanthroline derivatives serve as versatile ligands and structural cores in molecular assemblies.
- Amide linkages are crucial for connecting functional units in complex molecular architectures.
Purpose of the Study:
- To investigate the impact of solvent properties on the photophysical behavior of tripartite BODIPY-phenanthroline molecules.
- To elucidate the role of amide linkage type (secondary vs. tertiary) in solvent sensitivity.
- To understand the mechanism of fluorescence quenching and its relationship with solvent-induced conformational changes.
Main Methods:
- Synthesis of tripartite molecules featuring BODIPY units and a 1,10-phenanthroline core with amide linkages.
- Steady-state and time-resolved fluorescence spectroscopy to measure quantum yield and lifetime.
- Solvent polarity studies using static dielectric constant and analysis of anomalous behavior in specific solvents.
- Molecular modeling to investigate conformational dynamics and their influence on charge transfer.
Main Results:
- Fluorescence lifetime and quantum yield exhibit unexpected solvent dependence.
- Secondary amide derivatives show greater sensitivity to environmental changes compared to tertiary amides.
- Increasing solvent polarity generally reduces fluorescence, with exceptions in hydrogen bond accepting solvents.
- Molecular modeling suggests conformational changes in polar solvents facilitate light-induced charge transfer between BODIPY units, leading to fluorescence quenching.
Conclusions:
- Solvent-induced conformational changes are critical for understanding fluorescence quenching in these BODIPY-phenanthroline systems.
- The nature of the amide linkage significantly modulates the molecule's response to solvent polarity.
- The findings provide insights into designing functional molecular materials with tunable photophysical properties based on solvent interactions.
More Related Videos
Related Concept Videos
00:52¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
1.4K
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
1.4K
01:15¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR
1.8K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.8K
01:17Chemical Shift: Internal References and Solvent Effects
1.5K
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
1.5K
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
3.8K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
3.8K
01:09¹H NMR: Pople Notation
2.8K
The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
A proton...
A proton...
2.8K
00:58¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons
3.7K
Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
3.7K