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Towards the Molecular Design of Spin‐Crossover Complexes of 2,6‐Bis(pyrazol‐3‐yl)pyridines
Author(s) -
Nikovskiy Igor,
Polezhaev Alexander,
Novikov Valentin,
Aleshin Dmitry,
Pavlov Alexander,
Saffiulina Elnara,
Aysin Rinat,
Dorovatovskii Pavel,
Nodaraki Lydia,
Tuna Floriana,
Nelyubina Yulia
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202000047
Subject(s) - spin crossover , steric effects , denticity , substituent , ligand (biochemistry) , chemistry , spin states , transition metal , stereochemistry , spin (aerodynamics) , crystallography , metal , computational chemistry , inorganic chemistry , organic chemistry , physics , biochemistry , receptor , thermodynamics , catalysis
Abstract The molecular design of spin‐crossover complexes relies on controlling the spin state of a transition metal ion by proper chemical modifications of the ligands. Herein, the first N,N’‐disubstituted 2,6‐bis(pyrazol‐3‐yl)pyridines (3‐bpp) are reported that, against the common wisdom, induce a spin‐crossover in otherwise high‐spin iron(II) complexes by increasing the steric demand of a bulky substituent, an ortho ‐functionalized phenyl group. As N,N’‐disubstituted 3‐bpp complexes have no pendant NH groups that make their spin state extremely sensitive to the environment, the proposed ligand design, which may be applicable to isomeric 1‐bpp or other families of popular bi‐, tri‐ and higher denticity ligands, opens the way for their molecular design as spin‐crossover compounds for future breakthrough applications.