There are disclosed novel compounds, liquid crystal compositions, polymers, optically anisotropic products, and optical or liquid crystal elements that have large refractive index anisotropy, mix easily with other liquid crystals, have advantageous stability against light, and exhibit absorption at practically short wavelength in the ultraviolet region. The compounds are represented by the formula (1) and have a phenylacetylene structure, wherein difference ΔE in energy of HOMO of parts (1-1), (1-2) and (1-3) calculated by the method of molecular orbitals is not less than 0.3 electronvolt, and the polarizability anisotropy Δα of a molecule represented by the formula (1) calculated in the same way is not lower than 500 A.U.:
(A
1
to A
4
: H, F, alkyl or alkoxy group of C1 to C10 optionally substituted with F; P
1
, P
2
: structure fulfilling the conditions of HOMO energy and polarizability).
本发明揭示了新的化合物、液晶组合物、聚合物、光学各向异性产品和具有大折射率各向异性、易于与其他液晶混合、对光稳定性有优势、在紫外线短波长区域表现出吸收的光学或液晶元素。所述化合物由式(1)表示,具有
苯乙炔结构,其中通过分子轨道法计算的部分(1-1)、(1-2)和(1-3)的HOMO能级差ΔE不小于0.3电子伏特,以及由式(1)表示的分子的极化率各向异性Δα在相同方式下计算不低于500 A.U。(A1至A4:C1至C10的氢、
氟、烷基或烷氧基,可选地取代F;P1、P2:满足HOMO能级和极化率条件的结构)。