Spin-Crossover Complex on Au(111): Structural and Electronic Differences Between Mono- and Multilayers

Submono‐, mono‐ and multilayers of the Fe(II) spin‐crossover (SCO) complex [Fe(bpz)2(phen)] (bpz=dihydrobis(pyrazolyl)borate, phen=1,10‐phenanthroline) have beenprepared by vacuum deposition on Au(111) substrates and investigated with near edge X‐ray absorption fine structure (NEXAFS) spectroscopy a...

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Published in:Chemistry : a European journal 2013-11, Vol.19 (46), p.15702-15709
Main Authors: Gopakumar, Thiruvancheril G., Bernien, Matthias, Naggert, Holger, Matino, Francesca, Hermanns, Christian F., Bannwarth, Alexander, Mühlenberend, Svenja, Krüger, Alex, Krüger, Dennis, Nickel, Fabian, Walter, Waldemar, Berndt, Richard, Kuch, Wolfgang, Tuczek, Felix
Format: Article
Language:English
Subjects:
Chemistry
Decay
Deposition
Electronics
Fine structure
gold
iron
Multilayers
scanning tunnel microscopy
Scanning tunneling microscopy
spin crossover
spintronics
Vacuum deposition
X-ray absorption spectroscopy
X-rays
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Summary:Submono‐, mono‐ and multilayers of the Fe(II) spin‐crossover (SCO) complex [Fe(bpz)2(phen)] (bpz=dihydrobis(pyrazolyl)borate, phen=1,10‐phenanthroline) have beenprepared by vacuum deposition on Au(111) substrates and investigated with near edge X‐ray absorption fine structure (NEXAFS) spectroscopy and scanning tunneling microscopy (STM). As evidenced by NEXAFS, molecules of the second layer exhibit a thermal spin crossover transition, although with a more gradual characteristics than in the bulk. For mono‐ and submonolayers of [Fe(bpz)2(phen)] deposited on Au(111) substrates at room temperature both NEXAFS and STM indicate a dissociation of [Fe(bpz)2(phen)] on Au(111) into four‐coordinate complexes, [Fe(bpz)2], and phen molecules. Keeping the gold substrate at elevated temperatures ordered monolayers of intact molecules of [Fe(bpz)2(phen)] are formed which can be spin‐switched by electron‐induced excited spin‐state trapping (ELIESST). Switchable spins: The FeII spin‐crossover (SCO) complex [Fe(bpz)2(phen)] (bpz=dihydrobis(pyrazolyl)borate, phen=1,10‐phenanthroline) partly decays to four‐coordinate complexes [Fe(bpz)2] and phen molecules upon vacuum deposition on Au(111) substrates (see figure). Molecules of the second layer are intact and exhibit thermal SCO. Through variation of deposition conditions ordered structures of intact molecules can also be generated on the surface.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201302241