The use of opto-thermal molecular energy storage at the nanoscale creates new opportunities for powering future microdevices with flexible synthetic tailorability. Practical application of these molecular materials, however, requires a deeper microscopic understanding of how their behavior is altered by the presence of different types of substrates. Here we present single-molecule resolved scanning tunneling microscopy imaging of thermally- and optically-induced structural transitions in (fulvalene)tetracarbonyldiruthenium molecules adsorbed onto a Ag(100) surface as a prototype system. Both the parent complex and the photoisomer display distinct thermally-driven phase transformations when they are in contact with a Ag(100) surface. This behavior is consistent with the loss of carbonyl ligands due to strong molecule-surface coupling. Ultraviolet radiation induces marked structural changes only in the intact parent complex, thus indicating a photoisomerization reaction. These results demonstrate how stimuli-induced structural transitions in this class of molecule depend on the nature of the underlying substrate.
@article{arxiv.1703.00115,
title = {Imaging structural transitions in organometallic molecules on Ag(100) for solar thermal energy storage},
author = {Jongweon Cho and Ivan V. Pechenezhskiy and Luis Berbil-Bautista and Steven K. Meier and K. Peter C. Vollhardt and Michael F. Crommie},
journal= {arXiv preprint arXiv:1703.00115},
year = {2017}
}