Femtosecond Spin-State Switching Dynamics of Fe(II) Complexes Condensed in Thin Films

被引：0

作者：

Kaemmerer, Lea ^{[1
,2
]}

Kaemmerer, Gerald ^{[1
,2
]}

Gruber, Manuel ^{[1
,2
]}

Grunwald, Jan ^{[3
]}

Lojewski, Tobias ^{[1
,2
]}

Mercadier, Laurent ^{[4
]}

Le Guyader, Loic ^{[4
]}

Carley, Robert ^{[4
]}

Carinan, Cammille ^{[4
]}

Gerasimova, Natalia ^{[4
]}

Hickin, David ^{[4
]}

Van Kuiken, Benjamin E. ^{[4
]}

Mercurio, Giuseppe ^{[4
]}

Teichmann, Martin ^{[4
]}

Kuppusamy, Senthil Kumar ^{[5
]}

Scherz, Andreas ^{[4
]}

Ruben, Mario ^{[5
,6
]}

Sokolowski-Tinten, Klaus ^{[1
,2
]}

Eschenlohr, Andrea ^{[1
,2
]}

Ollefs, Katharina ^{[1
,2
]}

Schmitz-Antoniak, Carolin ^{[7
]}

Tuczek, Felix ^{[3
]}

Kratzer, Peter ^{[1
,2
]}

Bovensiepen, Uwe ^{[1
,2
]}

Wende, Heiko ^{[1
,2
]}

机构：

[1] Univ Duisburg Essen, Fac Phys, D-47057 Duisburg, Germany

[2] Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CENIDE, D-47057 Duisburg, Germany

[3] Univ Kiel, Inst Inorgan Chem, D-24098 Kiel, Germany

[4] European XFEL, D-22869 Schenefeld, Germany

[5] Karlsruhe Inst Technol KIT, Inst Quantum Mat & Technol IQMT, D-76131 Karlsruhe, Germany

[6] Inst Sci & Ingn Supramol ISIS, Ctr Europeen Sci Quant CESQ, Cedex, F-67083 Strasbourg, France

[7] Tech Univ Appl Sci Wildau, Fac Engn & Nat Sci, D-15745 Wildau, Germany

来源：

ACS NANO | 2024年 / 18卷 / 51期

关键词：

spin crossover; ultrafast switching; molecularfilm; X-ray free-electron laser; time-resolved X-rayabsorption spectroscopy; X-RAY SPECTROSCOPY; MULTISTEP TRANSITIONS; CROSSOVER COMPLEXES; VACUUM; TEMPERATURE; HYSTERESIS; MECHANISM; INTERPLAY; CHARGE;

D O I：

10.1021/acsnano.4c05123

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The tailoring of spin-crossover films has made significant progress over the past decade, mostly motivated by the prospect in technological applications. In contrast to spin-crossover complexes in solution, the investigation of the ultrafast switching in spin-crossover films has remained scarce. Combining the progress in molecule synthesis and film growth with the opportunities at X-ray free-electron lasers, we study the photoinduced spin-state switching dynamics of a molecular film at room temperature. The subpicosecond switching from the S = 0 low-spin ground state to the S = 2 high-spin state is monitored by analyzing the transient evolution of the Fe L3 X-ray absorption edge fine structure, i.e. element-specifically at the switching center of the Fe(II) complex. Our measurements show the involvement of an intermediate state in the switching. At large excitation fluences, the fraction of high-spin molecules saturates at approximate to 50%, which is likely due to molecule-molecule interaction within the film.

引用

页码：34596 / 34605

页数：10

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