Tricyclic Spacer Systems for Nonlinear Optical Chromophores
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The production of commercially viable nonlinear optical (NLO) polymers is hindered by the aggregation of chromophores and the lack of long-term thermal stability, which limits their hyperpolarizability and electro-optic coefficients.
Innovation Solution
The introduction of spacer systems that separate individual chromophores to prevent aggregation and provide multi-point material integration for enhanced thermal stability, utilizing specific chemical structures and functional groups to create a stable nonlinear optical polymer with engineered spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chromophores are incorporated at large molecular densities to achieve high material hyperpolarizability, then the electro-optic performance is improved, but chromophores form multi-molecular dipolarly-bound aggregates that cannot be dismantled via realistic field energies
Solution Approach 1:
The invention divides the chromophore system into isolated individual units by introducing spacer molecules between chromophores. This segmentation prevents the formation of multi-molecular aggregates while maintaining high chromophore density, resolving the contradiction between quantity and compositional stability.
Solution Approach 2:
Spacer molecules serve as intermediary elements between chromophores, physically separating them and preventing direct dipolar interactions that lead to aggregation. These intermediaries allow high chromophore density without forming stable aggregated structures.
2Reliability
If external electric field is applied during material processing to create noncentrosymmetric order, then the electro-optic coefficient is improved, but chromophores with dipole moments form dipolarly-bound aggregates that resist field-induced ordering
Solution Approach 1:
By segmenting the chromophore system with spacers, each chromophore becomes an isolated unit that can be independently oriented by external electric fields without being locked into aggregate structures. This simplifies the molecular organization process while maintaining high electro-optic coefficients.
3Duration of action of stationary object
If chromophores are integrated into polymeric structures for thermal stability, then the long-term stability is improved, but molecular mobility increases leading to reinstitution of centrosymmetry over time
Solution Approach 1:
The spacer molecules create isolated chromophore units within the polymeric structure, restricting molecular mobility through physical confinement. This segmentation allows the polymer to provide thermal stability while preventing the chromophores from migrating and reinstating centrosymmetry.
Solution Approach 2:
The spacer-chromophore complexes create localized regions with restricted molecular mobility, while the bulk polymer provides overall thermal stability. This local quality approach allows simultaneous achievement of both thermal stability and long-term noncentrosymmetric order.
Data Source
AI summary
A compound for spacing nonlinear optical chromophores of the Formula Iand the commercially acceptable salts, solvates and hydrates thereof, wherein R1, R2, R3, R4, W, X, Y, Z, Q1, Q2, Q4 and L have the definitions provided herein.