Polycatenar pyrazole and pyrazolate ligands as building blocks of new columnar Pd(ii) metallomesogens
作者:Cristián Cuerva、José A. Campo、Paloma Ovejero、María R. Torres、Mercedes Cano
DOI:10.1039/c4dt00369a
日期:——
Dicatenar pyridine-functionalised pyrazole ligands [HpzR(n,n)py] (R(n,n) = C6H3(OCnH2n+1)2, n = 4, 6, 8, 10, 12, 14, 16, 18) have been strategically synthesised to be used as new building blocks for designing discotic liquid crystalline materials. Their coordination to Pd(II) fragments has allowed to achieve two novel families of metallomesogens, [Pd(pzR(n,n)py)2] (I) and [PdCl2(HpzR(n,n)py)] (II)
双catenar吡啶官能化的吡唑配体[Hpz R(n,n)py ](R(n,n)= C 6 H 3(OC n H 2 n +1)2,n = 4、6、8、10、12 ,14、16、18)已战略性地合成,用作设计盘状液晶材料的新构件。它们与Pd(II)片段的配位已实现了两个新的成矿作用原家族[Pd(pz R(n,n)py)2 ](I)和[PdCl 2(Hpz R(n,n)py)](II),其中配体以阴离子形式配位为吡唑酸酯或以中性形式配位为吡唑。热学研究表明,在68–141°C的温度范围内,具有n = 14和16个碳原子的配体以及所有钯配合物均显示出盘状中间相。结果表明,金属周围的配位环境是决定中间相超分子排列的决定因素。来自复合物的盘状分子I自身堆积成圆柱结构,形成六方柱状相(Col h),而来自II的半圆盘状分子会自组装成具有反平行二聚体排列的层,该层会生成层状柱状相(Col L)。提出了