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

被引：94

作者：

Gopakumar, Thiruvancheril G. ^{[1
]}

Bernien, Matthias ^{[2
]}

Naggert, Holger ^{[3
]}

Matino, Francesca ^{[1
]}

Hermanns, Christian F. ^{[2
]}

Bannwarth, Alexander ^{[3
]}

Muehlenberend, Svenja ^{[1
]}

Krueger, Alex ^{[2
]}

Krueger, Dennis ^{[2
]}

Nickel, Fabian ^{[2
]}

Walter, Waldemar ^{[2
]}

Berndt, Richard ^{[1
]}

Kuch, Wolfgang ^{[2
]}

Tuczek, Felix ^{[3
]}

机构：

[1] Univ Kiel, Inst Expt & Angew Phys, D-24098 Kiel, Germany

[2] Free Univ Berlin, Inst Expt Phys, D-14195 Berlin, Germany

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

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2013年 / 19卷 / 46期

关键词：

iron; gold; scanning tunnel microscopy; spintronics; spin crossover; X-ray absorption spectroscopy; THIN-FILMS; MOLECULES; FE(PHEN)(2)(NCS)(2); PRESSURE; VACUUM; STATES;

D O I：

10.1002/chem.201302241

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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).

引用

页码：15702 / 15709

页数：8

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