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Influence of CF 3 Substituents on the Spin Crossover Behavior of Iron(II) Coordination Polymers with Schiff Base‐like Ligands
Author(s) -
Kurz Hannah,
Sander Joan,
Weber Birgit
Publication year - 2020
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201900354
Subject(s) - spin crossover , schiff base , crystallography , polymer , coordination polymer , ligand (biochemistry) , diffraction , chemistry , powder diffraction , bridging ligand , materials science , crystal structure , physics , optics , organic chemistry , biochemistry , receptor
A Schiff base‐like ligand bearing CF 3 substituents was synthesized and converted to iron(II) coordination polymers [{FeL(L ax )} n ] using five different bridging ligands L ax . The structure of the coordination polymers was investigated using powder X‐ray diffraction and single‐crystal X‐ray diffraction in the case of [{FeL(bipy)} n ]. The later revealed an untypical ABAB pattern of alternating equatorial ligands rotated by 180° with regard to each other along the chain. The temperature‐dependent magnetic behavior was investigated with a SQUID magnetometer and the spin states at room temperature were confirmed by 57 Fe‐Mössbauer spectroscopy. Three out of five coordination polymers show spin crossover behavior in the temperature range between 50 and 400 K with different kind of curve progressions (abrupt, gradual, step‐wise). The other two coordination polymers are either fully highspin or fully low spin.