[en] Full text: Multimetallic complexes are molecular compounds composed of organic ligands coordinated with several metal atoms. These systems exhibit chemical and electronic properties that allow for a vast range of applications, in particular in the area of catalysis. Yet, their synthesis remains challenging. On-surface supramolecular chemistry – a bottom-up approach driven by noncovalent interactions between molecules and atoms on a surface – allows for the design of atomically precise organic and metal-organic nanomaterials, whose morphology, properties and functionalities can differ dramatically from those of compounds obtained via conventional synthetic chemistry. Here, I will describe the bottom-up synthesis of one-dimensional coordination nanostructures on a noble metal surface, where the coordination motif is based on an iron-terpyridine interaction borrowed from functional metal-organic complexes used in photovoltaic and catalytic applications. By a combination of low-temperature scanning tunneling microscopy (STM) and spectroscopy, STM manipulation, non-contact atomic force microscopy and density functional theory, I will show that the metal-ligand coordination motif consists of coplanar head-to-head terpyridine groups linked via a linear tri-iron cluster. This unusual metal-organic structure not been observed from conventional solution-based synthetic chemistry methods, and is enabled by the bottom-up on-surface synthesis, opening the door to novel pathways for the engineering of nanomaterials with tailored electronic, catalytic and magnetic functionalities. (author)