Metallo-Responsive Liquid Crystalline Monomers and Polymers
Metallo-Responsive Liquid Crystalline Monomers and Polymers
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DOI：
10.1021/cm2011617
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发表时间：
2011-08-09
影响因子：
8.6
通讯作者：
Rowan, Stuart J.
中科院分区：
文献类型：
--
作者：
McKenzie, Blayne M.;Wojtecki, Rudy J.;Rowan, Stuart J.
合成并研究了一系列具有化学响应性的含配体液晶单体。这些分子是2，6-双苯并咪唑基吡啶（Bip）配体的官能化衍生物。调整芳族核的大小和两对烷基取代基的长度允许制备具有一系列可调热液晶转变和相的介晶。镧系元素和/或过渡金属盐与含有介晶的配体的结合导致从液晶态到各向同性态的转变。单体的无环二烯复分解产生低聚物或聚合物，分别取决于烯烃是末端还是非末端。低聚物和聚合物都表现出各向异性液晶行为，在金属离子存在下变得各向同性。
A series of liquid crystalline ligand-containing monomers with chemo-responsive properties has been prepared and studied. These molecules are functionalized derivatives of the 2,6-bisbenzimidazolylpyridine (Bip) ligand. Tailoring the size of the aromatic core and the length of two pairs of alkyl substituents allows the preparation of mesogens with a range of tunable thermal liquid crystalline transitions and phases. The binding of lanthanide- and/or transition metal salts to the ligand containing mesogens results in a transition from a liquid crystalline to an isotropic state. Acyclic diene metathesis of the monomers yielded either oligomers or polymers, dictated by whether the alkene is either terminal or nonterminal, respectively. Both oligomers and polymers exhibit enantiotropic liquid crystalline behavior and become isotropic in the presence of metal ions.