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Self‐Assembly of Tetrahedral and Trigonal Antiprismatic Clusters [Fe 4 (L 4 ) 4 ] and [Fe 6 (L 5 ) 6 ] on the Basis of Trigonal Tris‐Bidentate Chelators
Author(s) -
Saalfrank Rolf W.,
Glaser Horst,
Demleitner Bernhard,
Hampel Frank,
Chowdhry Mubarik M.,
Schünemann Volker,
Trautwein Alfred X.,
Vaughan Gavin B. M.,
Yeh Robert,
Davis Anna V.,
Raymond Kenneth N.
Publication year - 2002
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 - 10.1002/1521-3765(20020118)8:2<493::aid-chem493>3.0.co;2-5
Subject(s) - malonate , denticity , tris , chemistry , lambda , chelation , crystallography , carboxylate , stereochemistry , medicinal chemistry , crystal structure , inorganic chemistry , physics , organic chemistry , biochemistry , optics
In a one‐pot reaction, the tetranuclear iron chelate complex [Fe 4 (L 4 ) 4 ] 6 was generated from benzene‐1,3,5‐tricarboxylic acid trichloride ( 4 ), bis‐ tert ‐butyl malonate ( 5 a ), methyllithium, and iron( II ) dichloride under aerobic conditions. Alternatively, hexanuclear iron chelate complex [Fe 6 (L 5 ) 6 ] 7 was formed starting from bis‐ para‐ tolyl malonate ( 5 b ) by employing identical reaction conditions to those applied for the synthesis of 6 . The clusters 6 and 7 are present as racemic mixtures of homoconfigurational ( Δ , Δ , Δ , Δ )/( Λ , Λ , Λ , Λ )‐ fac or ( Δ , Δ , Δ , Δ , Δ , Δ )/ ( Λ , Λ , Λ , Λ , Λ , Λ )‐ fac stereoisomers. The structures of 6 and 7 were unequivocally resolved by single‐crystal X‐ray analyses. The all‐iron( III ) character of 6 and 7 was determined by Mössbauer spectroscopy.