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A Trinuclear Defect‐Grid Iron(II) Spin Crossover Complex with a Large Hysteresis Loop that is Readily Silenced by Solvent Vapor
Author(s) -
Steinert Markus,
Schneider Benjamin,
Dechert Sebastian,
Demeshko Serhiy,
Meyer Franc
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.201403068
Subject(s) - spin crossover , vertex (graph theory) , hysteresis , chemistry , molecule , spin states , solvent , spin (aerodynamics) , ion , chemical physics , metal , loop (graph theory) , spin transition , crystallography , photochemistry , materials science , condensed matter physics , inorganic chemistry , physics , thermodynamics , organic chemistry , graph , mathematics , discrete mathematics , combinatorics
A new type of [2×2] matrix‐like complexes with one vertex devoid of a metal ion has been selectively synthesized. The defect‐grid triiron(II) complex exhibits a sharp and complete spin‐crossover (SCO) from the 1HS‐2LS to the 2HS‐1LS state (HS: high spin; LS: low spin) with wide hysteresis near room temperature. Although the “structurally soft” H‐bonded vertex, elastically coupled to the metal ions, accounts for the stabilization of spin states, it also mediates a dramatic, yet reversible, response to the uptake of exogenous solvent molecules leading to silencing of the SCO. The high sensitivity towards those guest molecules, the short response time upon exposure, and the smooth reversibility of guest binding are favorable characteristics for future sensing applications of such defect grids.