Reversible Fe Magnetic Moment Switching in Catalytic Oxygen Reduction Reaction of Fe-Phthalocyanine Adsorbed on Ag(110)

被引：16

作者：

Bartolome, Juan ^{[1
,2
]}

Bartolome, Fernando ^{[1
,2
]}

Brookes, Nicholas B. ^{[3
]}

Sedona, Francesco ^{[4
]}

Basagni, Andrea ^{[4
]}

Forrer, Daniel ^{[4
,5
]}

Sambi, Mauro ^{[4
]}

机构：

[1] Univ Zaragoza, Inst Ciencia Mat Aragon, CSIC, E-50009 Zaragoza, Spain

[2] Univ Zaragoza, Dept Fis Mat Condensada, CSIC, E-50009 Zaragoza, Spain

[3] ESRF, CS40220, F-38043 Grenoble 9, France

[4] Univ Padua, Dipartimento Sci Chim, I-35131 Padua, Italy

[5] CNR IENI, I-35131 Padua, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2015年 / 119卷 / 22期

关键词：

RAY CIRCULAR-DICHROISM; SPIN;

D O I：

10.1021/acs.jpcc.5b02916

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The consequences of the evolution of the active site in the oxygen reduction reaction catalyzed by iron phthalocyanine (FePc) submonolayers deposited on the Ag(110) surface are explored. The capacity of reversibly and sharply switching the magnetic state of FePc molecules by chemical means is conclusively evidenced by X-ray magnetic circular dichroism (XMCD) at the Fe L-2,L-3 absorption edge. In the molecular oxygen-dosed phase, oxygen intercalates between the molecule and the surface, thereby switching the Fe magnetic moment from a nearly negligible (m(Tot)(exp) approximate to 0.26(1) mu(B)) to an order of magnitude larger value (m(Tot)(exp) approximate to 2.1(2) mu(B)). Moreover, the characteristic XMCD spectrum undergoes a crossover from metallic to oxidized Fe(III)-like line shape, in accordance with an oxygen-induced decoupling of the molecular electronic states from the underlying metal surface. The FePc acts as a reversible bifunctional chemical-magnetic switch at the atomic monolayer scale.

引用

页码：12488 / 12495

页数：8