Magnetic behaviour of bent-core mesogens derived from the 1,4-dihydrobenzo[e][1,2,4]triazin-4-yl†,Journal of Materials Chemistry C

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Magnetic behaviour of bent-core mesogens derived from the 1,4-dihydrobenzo[e][1,2,4]triazin-4-yl†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-02-26 00:00:00 , DOI: 10.1039/c8tc00487k
Szymon Kapuściński _{1,

2,

3,

4} , Anita Gardias _{4,

5,

6,

7} , Damian Pociecha _{4,

6,

8,

9} , Marcin Jasiński _{1,

2,

3,

4} , Jacek Szczytko _{4,

5,

6,

7} , Piotr Kaszyński _{1,

2,

3,

4,

10}

Affiliation

A series of bent-core mesogens 2[m,n] and 3[4,6][6,n] derived from the 1,4-dihydrobenzo[e][1,2,4]triazin-4-yl radical and containing two partially fluorinated alkyl tails and the non-fluorinated derivative 1[12] were prepared and investigated by optical, thermal, XRD and magnetic methods. All compounds with six CF₂ units in each terminal tail (2[6,n]) exhibit a smectic A phase with clearing temperatures in a range of 150–180 °C. Introduction of two different alkyl chain lengths into the molecular structure of 2 depressed the SmA–I transition temperature to about 120 °C in 3[4,6][6,n]. Solid-state EPR and magnetic susceptibility measurements (SQUID) for 3[4,6][6,8] revealed paramagnetic behaviour with weak intermolecular spin–spin interactions in the SmA phase suggesting low organization of the spin containing molecular units.

中文翻译：

1,4-二氢苯并[ e ] [1,2,4]三嗪-4-基†的弯曲核介晶的磁行为

一系列弯曲芯介晶的2米，Ñ ]和3 [4,6] [6,1 Ñ ]从1,4-二氢苯并[衍生ë ] [1,2,4]三嗪-4-基自由基和制备了含有两个部分氟化烷基尾基的非氟化衍生物1 [12]，并通过光学，热，XRD和磁性方法对其进行了研究。在每个末端尾部（2 [6，n ]）具有6个CF ₂单元的所有化合物均表现出近晶A相，其澄清温度范围为150-180°C。将两个不同的烷基链长引入2的分子结构在3 [4,6] [6，n ]中将SmA–I的转变温度降低至约120°C 。固态EPR和3 [4,6] [6,8]的磁化率测量（SQUID）显示顺磁性行为，在SmA相中分子间自旋-自旋相互作用较弱，表明自旋包含分子单元的组织较低。

更新日期：2018-02-26

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