Surface-Based Self-Assembly of 3-D Spintronic Coordination Nano-Architectures

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Within the frame of COORNETs we aim at the construction of robust 3-D spintronic coordination networks at well-defined interfaces under ultra-high vacuum conditions using sublimation and/or electrospray ionization (ESI) deposition of building blocks. The 3-D self-assembly process exploits metal-ligand interactions between custom-designed molecular linkers and magnetically active metal centers to afford functional nano-architectures. We notably plan to engineer templated coordination networks providing different magnetic features, incorporating (i) Fe(II) based spin-crossover (SCO) or (ii) tetrapyrrole molecules functionalized with magnetic transition metals or lanthanides. Moreover, enhancement of electric conductivity will be explored by (i) inclusion of photopolymerizable moieties in the MOF building block or (ii) engineering of the coordination node. The physicochemical properties and functional behaviour of the obtained surface-based 3-D networks will be studied by molecular-level scanning tunneling microscopy/spectroscopy observations (STM/STS), complemented by high-resolution X-ray spectroscopies, X-ray magnetic circular dichroism (XMCD), and a set of complementary sophisticated methods. Input: Our collaboration relies on a longstanding expertise in the self-assembly and the characterization of molecule-based coordination and covalent networks or nanostructures on surfaces (with more than 35 joint publications during the last years). In particular, we are herein interested in spintronic materials and devices, including their structural, electronic, magnetic or mechanical properties. The relevant proficiency relies on the conception of carefully tailored and de-novo synthesized molecular bricks, as well on the development of assembly protocols to steer processes and spatial organization under near-surface conditions. The structural, electrical and magnetic characterization of the obtained surface-based networks and nano-architectures is achieved mainly by a combination of STM/STS and X-ray spectroscopy techniques. Output offered: We plan to obtain new classes of spintronic coordination networks with unique functional properties, in particular (i) switchable magnetic properties based on spin crossover compounds and porphyrins/phthalocyanines combined with (ii) spintronic conductivity through engineering of either the coordination node or the functionalizing of linker species for post-synthetic photopolymerization.