Giant thermal expansion of a two-dimensional supramolecular network triggered by alkyl chain motion

Scherb, Sebastian and Hinaut, Antoine and Rémy Pawlak, Rémy and Vilhena, J. G. and Liu, Yi and Freund, Sara and Liu, Zhao and Feng, Xinliang and Müllen, Klaus and Glatzel, Thilo and Narita, Akimitsu and Meyer, Ernst. (2020) Giant thermal expansion of a two-dimensional supramolecular network triggered by alkyl chain motion. Communications Materials, 1 (1). p. 8.

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Thermal expansion, the response in shape, area or volume of a solid with heat, is usually large in molecular materials compared to their inorganic counterparts. Resulting from the intrinsic molecule flexibility, conformational changes or variable intermolecular interactions, the exact interplay between these mechanisms is however poorly understood down to the molecular level. Here, we investigate the structural variations of a two-dimensional supramolecular network on Au(111) consisting of shape persistent polyphenylene molecules equipped with peripheral dodecyl chains. By comparing high-resolution scanning probe microscopy and molecular dynamics simulations obtained at 5 and 300 K, we determine the thermal expansion coefficient of the assembly of 980 ± 110 × 10−6 K−1, twice larger than other molecular systems hitherto reported in the literature, and two orders of magnitude larger than conventional materials. This giant positive expansion originates from the increased mobility of the dodecyl chains with temperature that determine the intermolecular interactions and the network spacing.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
UniBasel Contributors:Glatzel, Thilo
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Springer Science and Business Media LLC
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:29 Apr 2021 14:44
Deposited On:29 Apr 2021 14:44

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