Colossal Anisotropic Thermal Expansion in a Diazo‐Functionalized Compound with Switchable Solid‐State Behavior

Author:

Ding Xiaodan1ORCID,Unruh Daniel K.1ORCID,Ma Liulei1ORCID,van Aalst Evan J.1,Reinheimer Eric W.2ORCID,Wylie Benjamin J.1ORCID,Hutchins Kristin M.1ORCID

Affiliation:

1. Department of Chemistry and Biochemistry Texas Tech University Lubbock TX 79409 USA

2. Rigaku Americas Corporation 9009 New Trails Drive The Woodlands TX 77381 USA

Abstract

AbstractAchieving substantial anisotropic thermal expansion (TE) in solid‐state materials is challenging as most materials undergo volumetric expansion upon heating. Here, we describe colossal, anisotropic TE in crystals of an organic compound functionalized with two azo groups. Interestingly, the material exhibits distinct and switchable TE behaviors within different temperature regions. At high temperature, two‐dimensional, area zero TE and colossal, positive linear TE (α=211 MK−1) are attained due to dynamic motion, while at low temperature, moderate positive TE occurs in all directions. Investigation of the solid‐state motion showed the change in enthalpy and entropy are quite different in the two temperature regions and solid‐state NMR experiments support motion in the solid. Cycling experiments demonstrate that the solid‐state motions and TE behaviors are completely reversible. These results reveal strategies for designing significant anisotropic and switchable behaviors in solid‐state materials.

Funder

National Science Foundation

Publisher

Wiley

Subject

General Medicine

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