Naslov
Self-Assembly, Dimerization and Polymerization of Aromatic C-Nitroso Derivatives on Gold Surface

Autori
Panić, Barbara ; Nuić, Laura ; Šrut Rakić, Iva ; Kralj, Marko ; Biljan, Ivana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
V Symposium on Supramolecular Chemistry - book of abstracts / Frkanec, Leo ; Namjesnik, Danijel ; Tomišić, Vladislav - Zagreb : Institut Ruđer Bošković, 2022, 17-17

Skup
5. simpozij supramolekulske kemije

Mjesto i datum
Zagreb, Hrvatska, 08.12.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Domaća recenzija

Ključne riječi
Aromatic C-nitroso compounds, Self-Assembly, Dimerization, Polymerization

Sažetak
Aromatic C-nitroso compounds are promising candidates for studying the adsorption of organic molecules on metal surfaces, their self-assembly into monolayers and multilayers, and for the design of new functional materials with potential application in areas such as molecular switches and organic semiconductors. Our recent studies have shown that aromatic C-nitroso compounds functionalized with a sulfur-containing group have a great tendency to bind to the gold (111) surface through a strong covalent S–Au bond and form self- assembled monolayers. Owing to the property of aromatic C-nitroso compounds to dimerize and polymerize to the corresponding azodioxides, it is also possible to design self-assembled bilayers (SABs) and multilayers by interactions of nitroso groups exposed at the monolayer interface and free nitroso groups in solution through azodioxy bonds. In the present study, we first examined the experimental conditions for the design of monolayers and bilayers of nitrosobenzene derivatives with thiocyanate headgroup for adsorption on the gold (111) surface. The growth of monolayers and bilayers was studied at different solution concentrations and adsorption times by using ellipsometry, atomic force microscopy (AFM) and scanning tunneling microscopy (STM). It was found that a higher solution concentration and longer adsorption times result in the formation of more ordered adlayers and an increased tendency towards bilayers. The obtained results were then used for the targeted preparation of monolayers with exposed nitroso groups which were employed as initiation sites for the formation of azodioxy multilayers by interactions with aromatic dinitroso derivatives. Various aromatic dinitroso derivatives and different adsorption times were used to examine the influence of structural and experimental parameters on the possible formation of azodioxy multilayers on the gold (111) surface. Morphological characteristics and thicknesses of the adlayers were investigated by atomic force microscopy (AFM) and ellipsometry, respectively, which indicated formation of azodioxy adlayers. This was strongly supported by nano-FTIR spectroscopy which enabled chemical identification of the adlayers at the nanoscale.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA