Surface-based self-assembly of 3-D spintronic coordination nano-architectures

Consortium: Dr. Anthoula C. Papageorgiou, Munich
Technical University Munich
Chair of Experimental Physics (E20)
  Dr. Svetlana Klyatskaya, Karlsruhe
Karlsruhe Institute of Technology
Institute of Nanotechnology
  Prof. Dr. Johannes V. Barth, Munich
Technical University Munich
Chair of Molecular Nanoscience & Chemical Physics of Interfaces
  Prof. Dr. Mario Ruben, Karlsruhe
Karlsruhe Institute of Technology
Institute of Nanotechnology
Projekt: Surface-Based Self-Assembly 3-D Spintronic Coordination Nano-Architectures
Abstract: 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. 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) lanthanide-based molecular magnetism. Moreover, the filling of the voids will be deliver electric conductivity by (i) inclusion of extended TCNQ-like species or (ii) an electro-polymerisation reaction of NC-monomers. The spin scattering of the conduction electrons in the voids at the spin centers of the network scaffold is expected to give access to spintronic 3-D coordination nano-architectures. In addition, light-switchable properties are introduced on the basis of the light-induced excited spin-state trapping (LIESST) of spin-crossover compounds or transition/lanthanide metal porphyrins. The physicochemical properties and functional behaviour of the obtained surface-based 3-D networks will be studied by scanning tunneling microscopy/spectroscopy (STM/STS), high-resolution X-ray spectroscopies, X-ray magnetic circular dichroism (XMCD) and a set of complementary sophisticated methods.

Input: Our collaboration owns a longstanding expertise in the self-assembly and the characterization of molecule-based coordination and covalent networks on surfaces (with more than joint 25 publications during the last 10 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 custom-designed molecular bricks and assembly protocols to steer processes and structure formation under near–surface conditions. The structural, electrical and magnetic characterization of the obtained surface-based networks 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, (ii) photo-responsive properties based on porphyrins, phthalocyanines as active linkers; combined with (iii) conductivity through pore filling with CN-substituted compounds showing electro-activity.
Publications: S. Klyatskaya, F. Klappenberger, U. Schlickum, D. Kühne, M. Marschall, J. Reichert, R. Deckert,
W. Krenner, G. Zoppellaro, H. Brune, J. V. Barth, M. Ruben
"Surface-Confined Self-Assembly of Di-carbonitrile Polyphenyls"
Adv. Funct. Mater. 2011, 21, 1230-1240
DOI: 10.1002/adfm.201001437
  W. Auwärter, D. Écija, F. Klappenberger, J. V. Barth
"Porphyrins at Interfaces"
Nat. Chem. 2015, 7, 105-120
DOI: 10.1038/nchem.2159
  A. C. Papageorgiou, S. Fischer, S. C. Oh, Ö. Sağlam, J. Reichert, A. Wiengarten, K. Seufert,
S. Vijayaraghavan, D. Écija, W. Auwärter, F. Allegretti, R. G. Acres, K. C. Prince, K. Diller,
F. Klappenberger, J. V. Barth
"Self-Terminating Protocol for an Interfacial Complexation Reaction in Vacuo by Metal–Organic Chemical Vapor Deposition"
ACS Nano 2013, 7, 4520-4526
DOI: 10.1021/nn401171z
  M. Urdampilleta, S. Klyatskaya, J. P. Cleuziou, M. Ruben, W. Wernsdorfer
"Supramolecular Spin Valves"
Nat. Mater. 2011, 10, 502-506
DOI: 10.1038/nmat3050
  I. Šalitroš, O. Fuhr, A. Eichhofer, R. Kruk, J. Pavlik, L. Dlháň, R. Boča, M. Ruben
"The Interplay of Iron(II) Spin Transition and Polymorphism"
Dalton Trans. 2012, 41, 5163-5171
DOI: 10.1039/c2dt11906d