Mechanically Responsive Crystalline Coordination Polymers with Controllable Elasticity. Issue 45 (17th October 2018)

• Record Type: Journal Article
• Authors: Đaković, Marijana; Borovina, Mladen; Pisačić, Mateja; Aakeröy, Christer B.; Soldin, Željka; Kukovec, Boris‐Marko; Kodrin, Ivan
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 45(2018)
• Page Start: 14801
• Page End: 14805
• Publication Date: 2018-10-17
• Subjects: coordination polymers -- crystal engineering -- flexible crystals -- halogen bonds -- hydrogen bonds; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201808687
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 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. Abstract : The bends : A class of elastic crystals of 1D cadmium(II) polymers was synthesized using a bottom‐up approach in which halide bridges between Cd II centres create the required stacking interaction. By carefully manipulating the structural influence of hydrogen bonds and halogen bonds perpendicular to the direction of the chains, it is possible to control the extent of elastic bending in these crystalline coordination compounds.