Abstract
The factors influencing negative wavelength dispersion are investigated for a series of benzodithiophene based photopolymerisable liquid crystals.
Highlights
The term Liquid Crystal refers to a distinct and unique phase of matter in-between that of a liquid and a solid, which is freemoving but possesses a long-range orientational order along a director.[1]
We reasoned that hydroxy groups in the 4,8 position would be a convenient approach to attach liquid crystalline ‘aligning’ groups, via ester formation
The hydroxy groups were protected as methyl ethers, allowing the ready synthesis of 4,8-dimethoxybenzodithiophene (4) at the 100 g scale
Summary
The term Liquid Crystal refers to a distinct and unique phase of matter in-between that of a liquid and a solid, which is freemoving but possesses a long-range orientational order along a director.[1]. All the components share a common alignment and optical axis and the compensating material must exhibit negative dispersion – that is, the birefringence is larger, at longer wavelengths. We report the synthesis and negative dispersive properties of a new series of RMs. These materials utilise benzodithiophene (BDT) cores, in which substituents are attached at the orthogonal 2,6 and 4,8positions and 2 and 4,6 positions to create ‘X’ and ‘T’ shaped molecular geometries respectively.
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