Self-assembly of tetrahedral and trigonal antiprismatic clusters [Fe4(L4)4] and [Fe6(L5)6] on the basis of trigonal tris-bidentate chelators.
In a one-pot reaction, the tetranuclear iron chelate complex [Fe4(L4)4] 6 was generated from benzene-1,3,5-tricarboxylic acid trichloride (4), bis-tert-butyl malonate (5a), methyllithium, and iron(II) dichloride under aerobic conditions. Alternatively, hexanuclear iron chelate complex [Fe(L5)6] 7 was formed starting from bis-para-tolyl malonate (5b) 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 (delta,delta,delta,delta)/(lambda,lambda,lambda,lambda)-fac or (delta,delta,delta,delta,delta,delta)/(lambda,lambda,lambda,lambda,lambda,lambda)-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.
Saalfrank
Rolf W
RW
Institut für Organische Chemie, Universität Erlangen-Nürnberg, Erlangen, Germany. saalfrank@organik.uni-erlangen.de
Glaser
Horst
H
Demleitner
Bernhard
B
Hampel
Frank
F
Chowdhry
Mubarik M
MM
Schünemann
Volker
V
Trautwein
Alfred X
AX
Vaughan
Gavin B M
GB
Yeh
Robert
R
Davis
Anna V
AV
Raymond
Kenneth N
KN