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Spin‐Crossover Complex on Au(111): Structural and Electronic Differences Between Mono‐ and Multilayers
Author(s) -
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
Publication year - 2013
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201302241
Subject(s) - spin crossover , xanes , scanning tunneling microscope , molecule , crystallography , monolayer , spin transition , dissociation (chemistry) , spin states , chemistry , transition metal , materials science , spectroscopy , inorganic chemistry , nanotechnology , organic chemistry , physics , quantum mechanics , catalysis
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).