Đaković Marijana, Borovina Mladen, Pisačić Mateja, Aakeröy Christer B, Soldin Željka, Kukovec Boris-Marko, Kodrin Ivan
Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000, Zagreb, Croatia.
Department of Chemistry, Kansas State University, Manhattan, KS, 66506, USA.
Angew Chem Int Ed Engl. 2018 Nov 5;57(45):14801-14805. doi: 10.1002/anie.201808687. Epub 2018 Oct 17.
Crystalline coordination polymers tend to be brittle and inelastic, however, we now describe a family of such compounds that are capable of displaying mechanical elasticity in response to external pressure. The design approach successfully targets structural features that are critical for producing the desired mechanical output. The elastic crystals all comprise 1D cadmium(II) halide polymeric chains with adjacent metal centres bridged by two halide ions resulting in the required stacking interactions and short "4 Å" crystallographic axes. These polymeric chains (structural "spines") are further organized via hydrogen bonds and halogen bonds perpendicular to the direction of the chains. By carefully altering the strength and the geometry of these non-covalent interactions, we have demonstrated that it is possible to control the extent of elastic bending in crystalline coordination compounds.
然而，晶体配位聚合物往往易碎且缺乏弹性，不过，我们现在描述了一类这样的化合物，它们能够在外部压力作用下表现出机械弹性。这种设计方法成功地针对了对于产生所需机械输出至关重要的结构特征。弹性晶体均由一维卤化镉（II）聚合物链组成，相邻的金属中心由两个卤离子桥连，从而产生所需的堆积相互作用和短的“4埃”晶体学轴。这些聚合物链（结构“主干”）通过垂直于链方向的氢键和卤键进一步排列。通过仔细改变这些非共价相互作用的强度和几何形状，我们已经证明可以控制晶体配位化合物中的弹性弯曲程度。
