Elasticity,as an emerging phenomenon of crystals,endows the newfangled properties on crystals owing to the altered local crystallinity in the deformed state,and hence attracts increasing research endeavors.However,onl...Elasticity,as an emerging phenomenon of crystals,endows the newfangled properties on crystals owing to the altered local crystallinity in the deformed state,and hence attracts increasing research endeavors.However,only a few molecular crystals and a limited number of one-dimensional coordination polymer crystals have exhibited such fantastic elastic response under mechanical stress.Herein,we report the first example of elastic hydrogen-bonded ionic framework(HIF)of{(CN_(3)H_(6))_(2)[Ti(μ_(2)-O)(SO_(4))_(2)]}n,assembled from one-dimensional negatively charged inorganic[Ti(μ_(2)-O)(SO_(4))_(2)]n 2n-chains and positively charged organic guanidinium cations via hydrogen bonds and electrostatic interactions.The slender prismatic single crystal exhibits remarkable elasticity with an optimal elastic bending strain(ε)of 2.5%.Impressively,the crystals give rise to two-dimensional elasticity owing to the equivalent crystallographic planes of the exposed faces and an unusual elastic response at liquid nitrogen temperature.The in-depth crystallographic analyses reveal hydrogen bonds and electrostatic interactions between anion chains and cations function like adhesive glue and account for such specific elastic properties,owing to the flexible and dynamic attributes of hydrogen bonds as they can work in a range of distance and orientation.And the channel in HIF provides space for bending with reduced strain.Incorporating these factors into low-dimensional crystals could be a general guidance for designing elastic crystals.Elasticity ganged with other intrinsic properties of HIF materials could inspire their newfangled applications in the near future.展开更多
Ladderlike polyhydroxypropylsilsesquioxane (HO-T) was synthesized by alcoholysis of ladderlike poly(3-propionyloxy-propyl)silsesquioxane. The HO-T was characterized by GPC, IR, NMR, DSC, TGA and X-ray diffraction meth...Ladderlike polyhydroxypropylsilsesquioxane (HO-T) was synthesized by alcoholysis of ladderlike poly(3-propionyloxy-propyl)silsesquioxane. The HO-T was characterized by GPC, IR, NMR, DSC, TGA and X-ray diffraction methods. Through hydrogen-bonding interaction, ladderlike polymer (HO-T) can form a supramolecular complex with somewhat regular structure.展开更多
基金We acknowledge support from the Chinese Academy of Sciences and University of Science and Technology of China,the National Key Research and Development Program of China(No.2021YFA1500402)the National Natural Science Foundation of China(Nos.21571167,51502282,and 22075266)the Fundamental Research Funds for the Central Universities(Nos.WK2060190053 and WK2060190100).
文摘Elasticity,as an emerging phenomenon of crystals,endows the newfangled properties on crystals owing to the altered local crystallinity in the deformed state,and hence attracts increasing research endeavors.However,only a few molecular crystals and a limited number of one-dimensional coordination polymer crystals have exhibited such fantastic elastic response under mechanical stress.Herein,we report the first example of elastic hydrogen-bonded ionic framework(HIF)of{(CN_(3)H_(6))_(2)[Ti(μ_(2)-O)(SO_(4))_(2)]}n,assembled from one-dimensional negatively charged inorganic[Ti(μ_(2)-O)(SO_(4))_(2)]n 2n-chains and positively charged organic guanidinium cations via hydrogen bonds and electrostatic interactions.The slender prismatic single crystal exhibits remarkable elasticity with an optimal elastic bending strain(ε)of 2.5%.Impressively,the crystals give rise to two-dimensional elasticity owing to the equivalent crystallographic planes of the exposed faces and an unusual elastic response at liquid nitrogen temperature.The in-depth crystallographic analyses reveal hydrogen bonds and electrostatic interactions between anion chains and cations function like adhesive glue and account for such specific elastic properties,owing to the flexible and dynamic attributes of hydrogen bonds as they can work in a range of distance and orientation.And the channel in HIF provides space for bending with reduced strain.Incorporating these factors into low-dimensional crystals could be a general guidance for designing elastic crystals.Elasticity ganged with other intrinsic properties of HIF materials could inspire their newfangled applications in the near future.
基金This project is financially supported by National Natural Science Foundation of China (No. 29874034).
文摘Ladderlike polyhydroxypropylsilsesquioxane (HO-T) was synthesized by alcoholysis of ladderlike poly(3-propionyloxy-propyl)silsesquioxane. The HO-T was characterized by GPC, IR, NMR, DSC, TGA and X-ray diffraction methods. Through hydrogen-bonding interaction, ladderlike polymer (HO-T) can form a supramolecular complex with somewhat regular structure.
