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Iron(III)‐Pivalate‐Based Complexes with Tetranuclear {Fe 4 (μ 3 ‐O) 2 } 8+ Cores and N ‐Donor Ligands: Formation of Cluster and Polymeric Architectures
Author(s) -
Baca Svetlana G.,
Filippova Irina G.,
Keene Tony D.,
Botezat Olga,
Malaestean Iurii L.,
StoeckliEvans Helen,
Kravtsov Victor Ch.,
Chumacov Iurii,
Liu ShiXia,
Decurtins Silvio
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201000838
Subject(s) - chemistry , hexamethylenetetramine , crystallography , carboxylate , cluster (spacecraft) , chelation , ligand (biochemistry) , ion , antiferromagnetism , metal , stereochemistry , inorganic chemistry , receptor , organic chemistry , computer science , programming language , condensed matter physics , biochemistry , physics
Different synthetic routes have been used for the preparation of a new tetranuclear [Fe 4 O 2 (O 2 CCMe 3 ) 8 (bpm)] cluster ( 1 ) and a one‐dimensional coordination polymer [Fe 4 O 2 (O 2 CCMe 3 ) 8 (hmta)] n ( 2 ) (bpm = 2,2′‐bipyrimidine and hmta = hexamethylenetetramine). For cluster 1 , two structural isomers, 1a and 1b· 3MeCN, have been found. X‐ray crystallographic analysis showed that all complexes consist of a central {Fe 4 (μ 3 ‐O) 2 } 8+ core. In 1a , metal ions in the core are additionally linked by six bridging pivalates as two other pivalates and a bpm ligand are chelated to Fe III ions, whereas in cluster 1b , metal ions in the {Fe 4 (μ 3 ‐O) 2 } 8+ core are linked by seven bridging pivalates and only one carboxylate as well as bpm are chelated to the iron centers. In coordination polymer 2 , [Fe 4 O 2 (O 2 CCMe 3 ) 8 ] clusters are bridged by hmta ligands to form zigzag chains. Magnetic measurements have been carried out to characterize these complexes and revealed antiferromagnetic interactions between Fe III ions with best‐fit parameters of J wb = –72.2 ( 1a ) and –88.7 cm –1 ( 1b ) for wing ··· body interactions.