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Title: Visualizing the origin of rotational entropy effects in coadsorbed systems

Abstract

We demonstrate that significant entropic effects govern the stability of rotationally constrained molecular complexes on surfaces. Using a complementary combination of low-temperature scanning tunneling microscopy, temperature programmed desorption, and density functional theory calculations, we probe the energetics of surface adsorbed molecular rotors as well as their corresponding rotationally hindered complexes. The results reveal that absorbate-absorbate interactions can significantly decrease the rotational entropy associated with such complexes leading to lower than expected desorption temperatures.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Tufts Univ., Medford, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1633131
Alternate Identifier(s):
OSTI ID: 1635802; OSTI ID: 1773873
Grant/Contract Number:  
SC0004738
Resource Type:
Published Article
Journal Name:
Physical Review Research
Additional Journal Information:
Journal Name: Physical Review Research Journal Volume: 2 Journal Issue: 2; Journal ID: ISSN 2643-1564
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; adsorption; desorption; surface & interfacial phenomena

Citation Formats

Hannagan, Ryan T., Groden, Kyle, Larson, Amanda M., Therrien, Andrew J., Thuening, Theodore, Schilling, Alex C., McEwen, Jean-Sabin, and Sykes, E. Charles H. Visualizing the origin of rotational entropy effects in coadsorbed systems. United States: N. p., 2020. Web. doi:10.1103/PhysRevResearch.2.023326.
Hannagan, Ryan T., Groden, Kyle, Larson, Amanda M., Therrien, Andrew J., Thuening, Theodore, Schilling, Alex C., McEwen, Jean-Sabin, & Sykes, E. Charles H. Visualizing the origin of rotational entropy effects in coadsorbed systems. United States. doi:https://doi.org/10.1103/PhysRevResearch.2.023326
Hannagan, Ryan T., Groden, Kyle, Larson, Amanda M., Therrien, Andrew J., Thuening, Theodore, Schilling, Alex C., McEwen, Jean-Sabin, and Sykes, E. Charles H. Fri . "Visualizing the origin of rotational entropy effects in coadsorbed systems". United States. doi:https://doi.org/10.1103/PhysRevResearch.2.023326.
@article{osti_1633131,
title = {Visualizing the origin of rotational entropy effects in coadsorbed systems},
author = {Hannagan, Ryan T. and Groden, Kyle and Larson, Amanda M. and Therrien, Andrew J. and Thuening, Theodore and Schilling, Alex C. and McEwen, Jean-Sabin and Sykes, E. Charles H.},
abstractNote = {We demonstrate that significant entropic effects govern the stability of rotationally constrained molecular complexes on surfaces. Using a complementary combination of low-temperature scanning tunneling microscopy, temperature programmed desorption, and density functional theory calculations, we probe the energetics of surface adsorbed molecular rotors as well as their corresponding rotationally hindered complexes. The results reveal that absorbate-absorbate interactions can significantly decrease the rotational entropy associated with such complexes leading to lower than expected desorption temperatures.},
doi = {10.1103/PhysRevResearch.2.023326},
journal = {Physical Review Research},
number = 2,
volume = 2,
place = {United States},
year = {2020},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1103/PhysRevResearch.2.023326

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