Hydrogen-bonded liquid crystals formed from 4-alkoxystilbazoles and chlorophenols
Hydrogen-bonded liquid crystals formed from 4-alkoxystilbazoles and chlorophenols
复制标题
由 4-烷氧基芪唑和氯酚形成的氢键液晶
DOI：
10.1039/d3ce00266g
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发表时间：
2023
期刊：
影响因子：
3.1
通讯作者：
Johnson O
中科院分区：
文献类型：
--
作者：
Johnson O
两种链长的4-烷氧基芪唑与六种不同的氯酚形成氢键复合物。其中四种复合物的单晶结构测定是可能的，所有这些复合物都显示出类似的二聚体基序，其中两个氯酚形成松散的背靠背二聚体，两侧均与二苯乙烯氮唑形成氢键。两个复合物在其三维包装中表现出相似性。除了含有五氯苯酚的配合物外，所有配合物都具有液晶性质。的相行为的长链dodecoxystilbazole配合物的近晶A相的观察占主导地位，而辛氧基同系物的双相和近晶A相。在这些新的配合物的中间相稳定性明显较低时，与先前报道的氟苯酚类似物相比，由于减少各向异性的影响，氯的更大的尺寸与氟相比。
Hydrogen-bonded complexes are formed between two chain lengths of 4-alkoxystilbazoles and six different chlorophenols. Single crystal structure determinations were possible for four of the complexes, all of which showed a similar dimeric motif in which two chlorophenols formed a loose back-to-back dimer with a stilbazole hydrogen-bonded at either side. Two of the complexes showed similarities in their three-dimensional packing. Liquid crystal properties were found for all complexes except those containing pentachlorophenol. The phase behaviour of the longer-chain dodecyloxystilbazole complexes was dominated by the observation of the smectic A phase, while both nematic and smectic A phases were found for the octyloxy homologues. The mesophase stability was appreciably lower in these new complexes when compared with fluorophenol analogues reported previously, attributed to a reduction in anisotropy on account of the effects of the greater size of chlorine compared with fluorine.