The 164th AMCP Open Seminar
New perspectives in molecular magnetism: on-surface synthesis and SPM characterization
Schedules
2022.11.28
Finished
Date & Time
November 28, 2022, 14:00 ~ 15:00
Venue
Sengen Main Bldg.8F Room No. 811,812+Online(Zoom)
※Non-NIMS staff can only participate online.
※Audio and video recordings are prohibited.
Registration
Please register for both on-site and online participation.
Click here to registerThose who have registered will be notified of a connection URL for online participation later.
Speaker
Pavel Jelinek (Head of NANOSURF Lab / Institute of Physics of the CAS)
Title
New perspectives in molecular magnetism: on-surface synthesis and SPM characterization
Abstract
The recent progress in ultra-high vacuum on-surface synthesis enabled to form new molecular structures, which are not available by traditional organic chemistry in solution [1]. This progress combined with atomic-scale characterization by means of scanning probe microscopy opens new possibilities to study new magnetic molecular structures.
Recently a lot of attention was paid to synthesis of open shell polyaromatic hydrocarbons (PAH) showing interesting magnetic properties [2]. In this talk, we will provide a brief review of different strategies to introduce π-magnetism in PAHs including frustrated topology of bipartite lattice or electron-electron correlation [3]. We will present unpublished data reporting synthesis of polyradical molecules with strong multireference character. Their electronic structure is analyzed using SPM technique including nickelocene functionalized probes as well as DMRG and CAS calculations which enables to describe properly the multireference states.
In the second part, we introduce on-surface synthesis of 1D coordination π-d conjugated polymers, achieved by co-deposition of 2HQDI molecular precursor and various transition metals (Fe, Co, Ni, Cr, Cu) atoms on metal surfaces under UHV conditions [3]. This route results in formation of magnetic π-d organometallic polymers with length up to hundreds of nanometers [4]. We will demonstrate fully reversible multiconfigurational light-driven spin crossover switches in a single π-d organometallic Co-QDI chain suspended between two electrodes. The external light enables us to realize reversible spin cross over between low and high-spin states of individual cobalt centers within the chain.
References
[1]S. Clair and D. G. de Oteyza, Chemical Reviews 119, 4717 (2019).
[2]J.Li et al., Nature Communication 10, 200 (2019); N. Pavlicek et al., Nature Nanotechnology 12, 308 (2017); S. Mishra et al., Nature Nanotechnology 15, 22 (2019).
[3]V.M. Santhini et al, Angew. Chem. Int. Ed. 60, 439 (2021).
[4]Ch. Wackerlin et al, ACS Nano (2022) DOI: 10.1021/acsnano.2c05609