Supramolecular interactions of anthraquinone networks on Au(111): Hydrogen bonds and van der Waals interactions

• Published in: Applied surface science Vol. 268; pp. 432 - 435
• Main Authors: Kim, Ji Yeon, Jang, Won Jun, Kim, Howon, Yoon, Jong Keon, Park, Jihun, Kahng, Se-Jong, Lee, Jhinhwan, Han, Seungwu
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.03.2013; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Hydrogen bond; Physics; Scanning tunneling microscope; Supramolecular network; Van der Waals interaction; Van der Waals interaction; Scanning tunneling microscope; Supramolecular network; Hydrogen bond; Scanning tunneling microscopy; Hydrogen bonds; Van der Waals forces
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2012.12.117

[Display omitted] ► We studied intermolecular interactions of supramolecular structures of anthraquinone molecules on Au(111) using scanning tunneling microscopy. ► We observed the molecular chains of linear and zigzag structures, and the molecular islands of square and chevron structures. ► Molecular models for the observed structures were explained with hydrogen bonds and van der Waals interactions, as revealed with our density functional theory calculations. ► Our study shows that van der Waals interactions play cooperative roles in determining the hydrogen bonded networks of the system. Intermolecular interactions of supramolecular structures were studied in anthraquinone molecules on Au(111) using scanning tunneling microscopy. Molecular chains of linear and zigzag structures were observed and explained with simple models of hydrogen bonds. In two-dimensional islands, square and chevron structures were observed, and their molecular models were reproduced by density functional theory calculations. Square structures were made of four hydrogen bonds per molecule, whereas chevron structures were explained with four hydrogen bonds per molecule and additional van der Waals interactions. Our study shows that van der Waals interactions play cooperative roles in determining the hydrogen bonded networks of the system.