Abstract
On-surface metal-organic polymers have emerged as a class of promising 2D materials. Here, we propose a new strategy to obtain coordination polymers by transforming supramolecular networks into coordination polymers by surface-assisted cyclo-dehydrogenation of organic building blocks. All nanostructures are fully characterized by using scanning tunneling microscopy under ultra-high vacuum on a gold surface. We demonstrated that the balance between molecule-molecule interaction and molecule-substrate interaction can be drastically modified by a strong modification of the geometry of the molecules thanks to a thermal annealing. This new way is an efficient method to elaborate on-surface coordination polymers.
Highlights
During the past two decades, self-organization of molecular materials on surfaces has been widely investigated in the case of organic molecules and molecular objects deposited on different kind of substrates [1,2,3,4,5]
As on-surface chemistry gives the opportunity to create new building blocks only accessible when they are adsorbed at the surface, we propose to transform an organic molecule into an organic linker by surface-assisted reaction
PBA and CPBA molecules were deposited by thermal sublimation under ultra-high vacuum (UHV) on an Au(111) substrate maintained at room temperature
Summary
During the past two decades, self-organization of molecular materials on surfaces has been widely investigated in the case of organic molecules and molecular objects deposited on different kind of substrates [1,2,3,4,5]. Among all types of nanostructures, coordination polymers have attracted attention because coordination bonds are reversible, leading to the possibility to self-reparation by bond scission and reformation in order to achieve the formation of defect-free nanostructures [21,22,23,24,25]. These polymers can be directly obtained on crystalline substrate by the deposition of polyfunctional organic linkers that are able to coordinate adatoms of the surface or co-deposited metallic atoms in ultra-high vacuum. As on-surface chemistry gives the opportunity to create new building blocks only accessible when they are adsorbed at the surface, we propose to transform an organic molecule into an organic linker by surface-assisted reaction
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