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Iron(II) Spin‐Crossover Complexes in Ultrathin Films: Electronic Structure and Spin‐State Switching by Visible and Vacuum‐UV Light
Author(s) -
Ludwig E.,
Naggert H.,
Kalläne M.,
Rohlf S.,
Kröger E.,
Bannwarth A.,
Quer A.,
Rossnagel K.,
Kipp L.,
Tuczek F.
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201307968
Subject(s) - photoexcitation , spin crossover , metastability , spin transition , spin states , spin (aerodynamics) , relaxation (psychology) , x ray photoelectron spectroscopy , excited state , materials science , quantum tunnelling , condensed matter physics , spectroscopy , electronic structure , chemistry , atomic physics , nuclear magnetic resonance , optoelectronics , physics , psychology , social psychology , organic chemistry , quantum mechanics , thermodynamics
The electronic structure of the iron(II) spin crossover complex [Fe(H 2 bpz) 2 (phen)] deposited as an ultrathin film on Au(111) is determined by means of UV‐photoelectron spectroscopy (UPS) in the high‐spin and in the low‐spin state. This also allows monitoring the thermal as well as photoinduced spin transition in this system. Moreover, the complex is excited to the metastable high‐spin state by irradiation with vacuum‐UV light. Relaxation rates after photoexcitation are determined as a function of temperature. They exhibit a transition from thermally activated to tunneling behavior and are two orders of magnitude higher than in the bulk material.