イベント
第164回先端計測オープンセミナー
New perspectives in molecular magnetism: on-surface synthesis and SPM characterization
Pavel Jelinek (Head of NANOSURF Lab / Institute of Physics of the CAS)
2022年11月28日（月）14:00 ~ 15:00
会場/Venue：
千現地区 研究本館8階中セミナー室（811・812室）＋オンライン（Zoom）
Sengen Central Bldg. 8F Meeting Room 811,812 + Online (Zoom）
※NIMS職員以外は、オンライン聴講のみ可能
※講演の録画・録音は禁止です。
※Non-NIMS staff can only participate online.
※Audio and video recordings are prohibited.
Sengen Central Bldg. 8F Meeting Room 811,812 + Online (Zoom）
※NIMS職員以外は、オンライン聴講のみ可能
※講演の録画・録音は禁止です。
※Non-NIMS staff can only participate online.
※Audio and video recordings are prohibited.
参加登録/Registration：
会場参加、オンライン参加を問わず、参加登録をお願いいたします。
登録はこちら
オンライン参加の接続URLは、登録が済まれた方に後日お知らせ致します。
Please register for both on-site and online participation.
Click here to register
Those who have registered will be notified of a connection URL for online participation later.
登録はこちら
オンライン参加の接続URLは、登録が済まれた方に後日お知らせ致します。
Please register for both on-site and online participation.
Click here to register
Those who have registered will be notified of a connection URL for online participation later.
講演者/Speaker：
Pavel Jelinek (Head of NANOSURF Lab / Institute of Physics of the CAS)
表題/Title：
New perspectives in molecular magnetism: on-surface synthesis and SPM characterization
概要/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 We will present unpublished data reporting synthesis of polyradical molecules with strong multireference character.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
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