Imaging structural transitions in organometallic molecules on Ag(100) for solar thermal energy storage

TL;DR

This study uses scanning tunneling microscopy to observe how organometallic molecules on Ag(100) surfaces undergo thermally- and optically-induced structural changes, revealing substrate-dependent behavior relevant for nanoscale energy storage.

Contribution

It provides the first detailed microscopic imaging of molecular structural transitions on a metal surface, highlighting substrate effects on thermally and optically driven transformations.

Findings

Thermally-driven phase changes involve loss of carbonyl ligands due to molecule-surface interactions.

Ultraviolet radiation causes structural changes only in the parent complex, indicating photoisomerization.

Substrate presence significantly influences the nature of stimuli-induced molecular transformations.

Abstract

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.