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Spin‐Crossover Properties of an Iron(II) Coordination Nanohoop
Author(s) -
Heras Ojea María José,
Van Raden Jeff M.,
Louie Shayan,
Collins Richard,
Pividori Daniel,
Cirera Jordi,
Meyer Karsten,
Jasti Ramesh,
Layfield Richard A.
Publication year - 2021
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.202013374
Subject(s) - spin crossover , octahedron , ligand (biochemistry) , crystallography , chemistry , spin (aerodynamics) , magnetic susceptibility , stereochemistry , crystal structure , physics , thermodynamics , biochemistry , receptor
Abstract Addition of the bipyridyl‐embedded cycloparaphenylene nanohoop bipy[9]CPP to [Fe{H 2 B(pyz) 2 }] (pyz=pyrazolyl) produces the distorted octahedral complex [Fe(bipy[9]CPP){H 2 B(pyz) 2 } 2 ] ( 1 ). The molecular structure of 1 shows that the nanohoop ligand contains a non‐planar bipy unit. Magnetic susceptibility measurements indicate spin‐crossover (SCO) behaviour with a T 1/2 of 130 K, lower than that of 160 K observed with the related compound [Fe(bipy){H 2 B(pyz) 2 } 2 ] ( 2 ), which contains a conventional bipy ligand. A computational study of 1 and 2 reveals that the curvature of the nanohoop leads to the different SCO properties, suggesting that the SCO behaviour of iron(II) can be tuned by varying the size and diameter of the nanohoop.