Sublimierbare Spin‐Crossover‐Komplexe: Vom Schalten des Spinzustands zu molekularen Bauelementen

Abstract

Wegen ihres bistabilen, bei Raumtemperatur schaltbaren Spinzustands bilden aktive Übergangsmetallkomplexe mit Spin‐Crossover (SCO) eine wichtige Gruppe von schaltbaren molekularen Materialien. Aus vakuumsublimierbaren SCO‐Komplexen, einer Untergruppe der SCO‐Komplexe, lassen sich ultrareine Filme mit schaltbarem Spin herstellen, wie sie insbesondere in der molekularen Elektronik/Spintronik benötigt werden. Dünne Filme aus sublimierbaren SCO‐Komplexen wurden deshalb mit spektroskopischen und mikroskopischen Techniken auf ihren oberflächenabhängigen SCO untersucht. In diesem Aufsatz werden vakuumsublimierbare SCO‐Komplexe und ihre Entwicklung umfassend beschrieben, insbesondere die Fortschritte im Design und in der Herstellung von sublimierbaren funktionalen SCO‐Komplexen, in der Ausprägung desoberflächenabhängigen SCO in molekularen Multilagenfilmen und die Konstruktion von Bauelementen mit molekularen Dünnschicht‐Architekturen von sublimierbaren SCO‐Komplexen als aktive Schaltelemente.

Stress‐Induced Domain Wall Motion in a Ferroelastic Mn3+ Spin Crossover Complex

“…[1] In contrast, ferroelectric DWs are Ising-like as the non-quantized polarization axis can vary in size and gradually reverse its sign. [1] It will therefore be of interest to further probe the internal structure of ferroelastic DWsi nS CO crystals,n anomaterials [7a] and films [32] using advanced imaging techniques suitable for different physical scales. [8]…”

Anomalous Light‐Induced Spin‐State Switching for Iron(II) Spin‐Crossover Molecules in Direct Contact with Metal Surfaces

“…[12] Meanwhile ar everse LIESST (r-LIESST,that is, switching from HS-to-LS) that can only be promoted by nearinfrared excitation has been discovered, [13] giving rise to applications in light driven memory devices. [14] To develop efficient nanoscale devices, [15,16] it is mandatory to study the light-induced processes at the level of SCO molecule-substrate interfaces. [17,18] Avery powerful technique to do so is X-ray absorption spectroscopy (XAS) as the measured Fe II L 2,3 edges have very different shapes in the LS and HS states.…”

Spin-Crossover Complexes in Direct Contact with Surfaces

“…To the best of our knowledge, Fe(1,10-phenanthroline) 2 (NCS) 2 was the first SCO complex to be successfully sublimated [27], followed by nine further compounds (Table 1 and Ref. [28]). The table is expected to grow soon, as several groups are working on newly synthesized SCO compounds.…”

“…[4][5][6]34,71,72] and in particular Ref. [28] that focuses on sublimable SCO compounds. While reversible switching of individual molecules on surfaces [25,30,31,38,67] as well as nearly full light-induced spin-state conversion of sub-monolayer coverages [24,41,52,69] have been evidenced for a number of systems, the surfaces appears to play a major role for the integrity and functionality of the adsorbed SCO complexes.…”