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Synthesis of Microcrystals of the [Fe(L)(bipy)] Spin Crossover Coordination Polymer in a Poly‐4‐vinylpyridine Matrix
Author(s) -
Göbel Christoph,
Palamarciuc Tatiana,
Lochenie Charles,
Weber Birgit
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201402144
Subject(s) - spin crossover , materials science , crystallography , polymer , spin transition , matrix (chemical analysis) , bridging ligand , coordination polymer , quasicrystal , mössbauer spectroscopy , chemistry , crystal structure , composite material
Abstract Microcrystals of the spin‐crossover coordination polymer [FeL(bipy)] (L=[3,3′]‐[1,2‐phenylenebis(iminoethylidyne)]bis‐(2,4‐pentanedionato)(2‐), bipy=4,4′‐bipyridine) have been prepared in a poly(4‐vinylpyridine) (P4VP) matrix. This was done by sequential addition of the iron(II) precursor complex and the bridging ligand bipy to a P4VP matrix, and by repetition of this cycle. The obtained composite material was characterized using TEM, SEM, XRPD, and SQUID measurements, and Mössbauer spectroscopy. With repeating cycles, the size of the [FeL(bipy)] crystals in the P4VP matrix increases from submicrometer to micrometer dimensions. A strong dependence on the number of cycles is observed. Above a critical size and concentration, the microcrystals show the same cooperative spin transition as the bulk material. No indication for a gradual spin transition is observed, but the remaining iron centers are either high‐spin or low‐spin depending on the coordination environment.