Catenane-Induced Exciplex Fluorescence for Live-Cell Imaging
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Solution Overview
Problem
Current methods for generating exciplex emissions from anthracene molecules are limited by toxicity issues, PL quenching due to photo-dimerization, and the difficulty in predicting aggregate orientations, making them unsuitable for bio-imaging and requiring high concentrations, which are not persistent at low concentrations.
Innovation Solution
The development of catenanes with mechanically interlocked macrocycles that arrange anthracene fluorophores in a face-to-face [π... π] stack, allowing for the formation of stable exciplex emissions at micromolar concentrations, suitable for live-cell imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If anthracene molecules are used at high concentrations to generate exciplex emissions, then exciplex PL can be observed, but toxicity issues arise and the molecules cannot be used in bio-imaging
Solution Approach 1:
The invention segments the anthracene system into mechanically interlocked macrocycles (catenanes) with precisely controlled spatial arrangement. This segmentation allows exciplex formation at low concentrations by enforcing close proximity through mechanical bonds, eliminating the need for high bulk concentrations that cause toxicity
Solution Approach 2:
The mechanically interlocked macrocycle structure acts as an intermediary that mediates the interaction between anthracene units. The rigid mechanical bond enforces face-to-face stacking geometry, enabling exciplex emission at low concentrations without requiring high anthracene concentrations that would be toxic
2Illumination intensity
If anthracene molecules are used to form exciplex emissions, then emission can be generated, but PL quenching occurs due to photo-dimerization
Solution Approach 1:
The invention applies preliminary anti-action by pre-organizing anthracene units in a face-to-face stacking geometry through mechanical interlocking. This pre-established arrangement favors radiative exciplex emission over photo-dimerization by controlling the spatial orientation and distance between anthracene units, preventing the side reactions that lead to PL quenching
Solution Approach 2:
The invention changes the structural parameters of the anthracene system by incorporating it into mechanically interlocked macrocycles. This alters the intermolecular distance, orientation, and stability parameters, enabling persistent exciplex emission at low concentrations while preventing photo-dimerization that causes PL quenching
3Stability of the object's composition
If anthracene units are allowed to interact freely, then aggregates can form, but the nature of aggregates is difficult to predict due to various orientations
Solution Approach 1:
The invention introduces asymmetry control through mechanical interlocking, which enforces a specific face-to-face stacking geometry between anthracene units. This mechanical constraint eliminates the randomness of aggregate orientations, making the aggregate structure predictable and well-defined rather than heterogeneous and unpredictable
4Illumination intensity
If conventional methods are used to generate exciplex emissions, then emissions can be achieved, but the aggregates are not persistent at very low concentrations
Solution Approach 1:
The invention applies preliminary action by pre-organizing anthracene units into mechanically interlocked macrocycles with fixed face-to-face stacking geometry before excitation. This pre-established structural arrangement ensures persistent exciplex emission at very low concentrations, eliminating the need for high concentrations to maintain aggregate stability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the detection of exciplex PL at low concentrations, overcoming toxicity and persistence issues, and facilitating bio-imaging applications by providing a stable and efficient means of generating exciplex emissions within live cells.
Implementation Method 1
Collisional intermolecular interactions between excited states form short-lived dimers and complexes that lead to the emergence of excimer/exciplex emission of lower energy
Implementation Method 2
the photoluminescence (PL) arising from the monomeric molecules
Implementation Method 3
Organic π-fluorophores, such as anthracene, show a strong tendency to form H- and J-type aggregates in highly concentrated solutions as well as in crystalline and liquid-crystalline states. The photophysical properties resulting from close [π...π] stacking is often different from those observed when the chromophores exist as single units
Data Source
AI summary
Disclosed herein are methods for live-cell imaging, compositions for performing the live cell imaging, and methods for making the composition. The method may comprise contacting a cell with an effective amount of a catenane, irradiating the cell, and detecting exciplex emission from the catenane within the cell. The catenane may comprise two mechanically interlocked macrocycles, each of the two macrocycles comprise an aromatic fluorophore subunit, and the aromatic fluorophores are arranged in a face-to-face [π . . . π] stack allowing for the exciplex emission.