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Magnetic Coupling of Porphyrin Molecules Through Graphene
Author(s) -
Hermanns Christian F.,
Tarafder Kartick,
Bernien Matthias,
Krüger Alex,
Chang YinMing,
Oppeneer Peter M.,
Kuch Wolfgang
Publication year - 2013
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201205275
Subject(s) - porphyrin , materials science , graphene , molecule , coupling (piping) , nanotechnology , photochemistry , organic chemistry , composite material , chemistry
X‐ray magnetic circular dichroism (XMCD) measurements and density functional theory (DFT)+ U calculations reveal an unexpected antiferromagnetic coupling between physisorbed paramagnetic Co‐porphyrin molecules and a Ni surface, separated by a graphene layer. A positive magnetization at the Ni substrate atoms is mediated by graphene and induces a negative one at the Co site, despite only a very small overlap between macrocyclic π and graphene p z ‐orbitals.
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