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首页> 外文期刊>Chemistry: A European journal >Supramolecular Assembly of Bis(benzimidazole)pyridine: An Extended Anisotropic Ligand For Highly Birefringent Materials
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Supramolecular Assembly of Bis(benzimidazole)pyridine: An Extended Anisotropic Ligand For Highly Birefringent Materials

机译：双（苯并咪唑）吡啶的超分子组装：高双折射材料的扩展各向异性配体。

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摘要

Four new bis(benzimidazole) pyridine (BBP)-containing compounds Zn(BBP)Cl[Au(CN)_2], Mn-(BBP)[Au(CN)_2]_2·H_2O, Mn(BBP)Br_2-(MeOH) and Mn(BBP)Cl_2-(MeOH)·MeOH have been synthesized and structurally characterized and their birefringence values (Dn) determined. The structure of Zn(BBP)Cl[Au(CN)_2] contains a hydrogen-bonded dimer of Zn(BBP)Cl[Au(CN)_2] units which propagate into a 1D chain through Au-Au interactions, although the crystals are of poor optical quality. The supramolecular structure of Mn-(BBP)[Au(CN)_2]_2·H_2O forms a 1D coordination polymer through chains of Mn(BBP)[Au(CN)_2]_2 units, each containing one bridging Au(CN)_2 and one forming a 2D sheet through Au-Au interactions. The supramolecular structures of Mn(BBP)Br_2(MeOH) and Mn-(BBP)Cl_2(MeOH)·MeOH are very similar, consisting of a complex hydrogen-bonded network between NH imidazole, methanol and halide groups to align BBP building blocks. In the plane of the primary crystal growth direction, the birefringence values of the three Mn-containing materials were Dn=0.08(1), 0.538(3) and 0.69(3), respectively. The latter two birefringence values are larger than in the related 2,2';6'2"-terpyridine systems, placing them among the most birefringent solids reported. These compounds illustrate the utility of extending the psystem of the building block and incorporating hydrogen-bonding sites as design elements for highly birefringent materials and also illustrates the effect on the measurable birefringence of the crystal quality, growth direction and structural alignment of the anisotropic BBP building blocks.
机译：四个新的含双（苯并咪唑）吡啶（BBP）的化合物Zn（BBP）Cl [Au（CN）_2]，Mn-（BBP）[Au（CN）_2] _2·H_2O，Mn（BBP）Br_2-（MeOH ）和Mn（BBP）Cl_2-（MeOH）·MeOH已合成并进行结构表征，并确定了它们的双折射值（Dn）。 Zn（BBP）Cl [Au（CN）_2]的结构包含氢键结合的Zn（BBP）Cl [Au（CN）_2]单元，尽管晶体通过Au-Au相互作用传播到一维链中光学质量较差。 Mn-（BBP）[Au（CN）_2] _2·H_2O的超分子结构通过Mn（BBP）[Au（CN）_2] _2单元链形成一维配位聚合物，每个单元包含一个桥接的Au（CN）_2一种通过Au-Au相互作用形成2D薄片。 Mn（BBP）Br_2（MeOH）和Mn-（BBP）Cl_2（MeOH）·MeOH的超分子结构非常相似，由NH咪唑，甲醇和卤化物基团之间的复杂氢键网络组成，以对齐BBP结构单元。在一次晶体生长方向的平面上，三种含锰材料的双折射率分别为Dn = 0.08（1），0.538（3）和0.69（3）。后两个双折射值大于相关的2,2'; 6'2“-吡啶吡啶系统，将它们置于报告的最双折射固体之中。这些化合物说明了扩展构件p系统和掺入氢的效用。键合位点作为高双折射材料的设计元素，还说明了对各向异性BBP构件的晶体质量，生长方向和结构排列的可测量双折射的影响。

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