Strong magnetic coupling of spins in Fe(ii) dimers with differently charged thioindigo ligands†
Dmitri V.
Konarev, 
*a
Mikhail S.
Batov,
ac
Akihiro
Otsuka,
de
Hideki
Yamochi,
de
Hiroshi
Kitagawa
d
and
*a
Mikhail S.
Batov,
ac
Akihiro
Otsuka,
de
Hideki
Yamochi,
de
Hiroshi
Kitagawa
d
and
Abstract
A first coordination {[2.2.2]cryptand(K+)}2{FeII(TI˙−)(TI2−)}2·2C6H4Cl2 (1) complex of iron(II) containing radical anions and dianions of thioindigo (TI) was obtained. The complex has two high-spin FeII centers bound by two oxygen atoms, and the TI˙− radical anions are coordinated to each FeII. As a result, the 4-spin system consisting of TI˙− (S = 1/2)–FeII (S = 2)–FeII (S = 2)–TI˙− (S = 1/2) coupled spins is formed within a dimer with strong FeII–FeII (J = −51.1 cm−1) and weaker FeII–TI˙− interactions of (J = −35.4 cm−1).
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