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Title: Odd–Even Structural Sensitivity on Dynamics in Network-Forming Ionic Liquids

Journal Article · · Chemistry of Materials
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As a compelling case of sensitive structure–property relationship, an odd–even effect refers to the alternating trend of physical or chemical properties on odd/even number of repeating structural units. In crystalline or semicrystalline materials, such odd–even effects emerge as manifestations of differences in the periodic packing patterns of molecules. Therefore, due to the lack of long-range order, such an odd–even phenomenon is not expected for dynamic properties in amorphous state. Herein, we report the discovery of a remarkable odd–even effect of dynamical properties in the liquid phase. In a class of glass-forming diammonium citrate ionic liquids, using incoherent quasi-elastic neutron scattering measurements, we measured the dynamical properties including diffusion coefficient and rotational relaxation time. These directly measured molecular dynamics showed pronounced alternating trends with increased number of methylene (-CH2-) groups in the backbone. Meanwhile, the structure factor S(Q) showed no long-range periodic packing of molecules, while the pair distribution function G(r) revealed subtle differences in the local molecular morphology. The observed dynamical odd–even phenomenon in liquids showed that profound dynamical changes originate from subtle local structural differences.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI ID:
1377908
Journal Information:
Chemistry of Materials, Vol. 28, Issue 9; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
ENGLISH

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Cited By (6)

Anomalous and Not-So-Common Behavior in Common Ionic Liquids and Ionic Liquid-Containing Systems journal June 2019
Ion specific, odd–even glass transition temperatures and conductivities in precise network polymerized ionic liquids journal January 2019
Investigation of structural ordering in network forming ionic liquids: A molecular dynamics study journal April 2019
Precise implications for real-space pair distribution function modeling of effects intrinsic to modern time-of-flight neutron diffractometers journal June 2018
Dynamic Odd-Even Effect in Liquid n -Alkanes near Their Melting Points journal October 2016
Dynamic Odd-Even Effect in Liquid n -Alkanes near Their Melting Points journal October 2016

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