Supramolecular interactions of anthraquinone networks on Au(1Â 1Â 1): Hydrogen bonds and van der Waals interactions

► We studied intermolecular interactions of supramolecular structures of anthraquinone molecules on Au(1 1 1) 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.