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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Physico-Chemical Properties of New Liquid Crystals Incorporating a Benzofuran-2-one Skeleton
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Physico-Chemical Properties of New Liquid Crystals Incorporating a Benzofuran-2-one Skeleton

机译:结合了苯并呋喃-2-酮骨架的新型液晶的理化性质

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The liquid crystal properties of 3H-2-oxobenzofuran-6-yl 4-(n-C_nH_(2n+1)O)benzoates (1-n,n = 5-12),4'-(n-C_nH_(2n+1))biphenyl-4-carboxylates (2-n,n = 6-10),and 4-(n-C_nH_(2n+1))benzoates (3-n,n = 4-6) are described.The n = 5-8 homologues of 1-n exhibit a nematic (N) phase,and the n = 8-12 homologues exhibit a smectic A (SmA) phase,where the layer spacing is ca.1.3 times of the calculated molecular length.The homologues of 2-n show a complex phase-transition behavior involving a smectic C (SmC),two kinds of SmA,reentrant nematic,and N phases,where the SmC phase is exhibited by the n = 6-8 homologues.The layer spacings of SmA phases formed at high and low temperature regions correspond to 1.3 and 1.0 times of the molecular lengths,respectively.The polar interactions around the terminal lactone moiety are assumed to play important roles for the complex polymesomorphism and diversity of the smectic layer structure.
机译:3H-2-氧代苯并呋喃-6-基4-(n-C_nH_(2n + 1)O)苯甲酸酯的液晶性质(1-n,n = 5-12),4'-(n-C_nH_(2n + 1))描述了4-羧酸联苯酯(2-n,n = 6-10)和4-(n-C_nH_(2n + 1))苯甲酸酯(3-n,n = 4-6)。 = n的5-8个同系物呈现向列(N)相,n = 8-12的同系物呈现近晶A(SmA)相,其中层间距约为计算分子长度的1.3倍。 2-n的同系物表现出复杂的相变行为,包括近晶C(SmC),SmA,折返向列和N相两种,其中SmC相由n = 6-8个同系物表现出来。在高温和低温区域形成的SmA相的分子分别对应于分子长度的1.3和1.0倍。假定末端内酯部分周围的极性相互作用对于近晶层结构的复杂多晶型和多样性起着重要作用。

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