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Iron(III)-pivalate-based complexes with tetranuclear {Fe4(?3-O)2}8+ cores and n-donor ligands: formation of cluster and polymeric architectures

Iron(III)-pivalate-based complexes with tetranuclear {Fe4(?3-O)2}8+ cores and n-donor ligands: formation of cluster and polymeric architectures
Iron(III)-pivalate-based complexes with tetranuclear {Fe4(?3-O)2}8+ cores and n-donor ligands: formation of cluster and polymeric architectures
Different synthetic routes have been used for the preparation of a new tetranuclear [Fe4O2(O2CCMe3)(8)(bpm)] cluster (1) and a one-dimensional coordination polymer [Fe4O2-(O2CCMe3)(8)(hmta)](n) (2) (bpm = 2,2'-bipyrimidine and hmta = hexamethylenetetramine). For cluster 1, two structural isomers, 1a and 1b center dot 3MeCN, have been found. X-ray crystallographic analysis showed that all complexes consist of a central {Fe-4(mu(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(mu(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, [Fe4O2(O2CCMe3)(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.
coordination polymers, iron, carboxylate ligands, n ligands, magnetic properties
1434-1948
356-367
Baca, Svetlana G.
bf5b0d5c-2e00-49c2-bfcc-05743a0d638d
Filippova, Irina G.
f8480f08-d405-4189-8e43-8e60b320d47b
Keene, Tony D.
fb859c26-6a1d-4c43-a15f-f329bc8d34d7
Botezat, Olga
d53f5e05-b533-4515-8486-e98e64ec739e
Malaestean, Iurii L.
9051302d-c49e-4d14-8edc-20617a418369
Stoeckli-Evans, Helen
0dca7568-de3d-4c81-a345-3de78a2d6c8d
Kravtsov, Victor Ch.
da0db5bf-8dca-4014-817b-38408adbe77f
Chumacov, Iurii
a3eee0ee-c6f5-493e-bbe1-d90dc9bf295d
Liu, Shi-Xia
546635e3-8931-436e-8456-298ac2a3134d
Decurtins, Silvio
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Baca, Svetlana G.
bf5b0d5c-2e00-49c2-bfcc-05743a0d638d
Filippova, Irina G.
f8480f08-d405-4189-8e43-8e60b320d47b
Keene, Tony D.
fb859c26-6a1d-4c43-a15f-f329bc8d34d7
Botezat, Olga
d53f5e05-b533-4515-8486-e98e64ec739e
Malaestean, Iurii L.
9051302d-c49e-4d14-8edc-20617a418369
Stoeckli-Evans, Helen
0dca7568-de3d-4c81-a345-3de78a2d6c8d
Kravtsov, Victor Ch.
da0db5bf-8dca-4014-817b-38408adbe77f
Chumacov, Iurii
a3eee0ee-c6f5-493e-bbe1-d90dc9bf295d
Liu, Shi-Xia
546635e3-8931-436e-8456-298ac2a3134d
Decurtins, Silvio
331985a5-2121-47e4-a4b2-2fd09f8cabfd

Baca, Svetlana G., Filippova, Irina G., Keene, Tony D., Botezat, Olga, Malaestean, Iurii L., Stoeckli-Evans, Helen, Kravtsov, Victor Ch., Chumacov, Iurii, Liu, Shi-Xia and Decurtins, Silvio (2011) Iron(III)-pivalate-based complexes with tetranuclear {Fe4(?3-O)2}8+ cores and n-donor ligands: formation of cluster and polymeric architectures. European Journal of Inorganic Chemistry, 2011 (3), 356-367. (doi:10.1002/ejic.201000838).

Record type: Article

Abstract

Different synthetic routes have been used for the preparation of a new tetranuclear [Fe4O2(O2CCMe3)(8)(bpm)] cluster (1) and a one-dimensional coordination polymer [Fe4O2-(O2CCMe3)(8)(hmta)](n) (2) (bpm = 2,2'-bipyrimidine and hmta = hexamethylenetetramine). For cluster 1, two structural isomers, 1a and 1b center dot 3MeCN, have been found. X-ray crystallographic analysis showed that all complexes consist of a central {Fe-4(mu(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(mu(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, [Fe4O2(O2CCMe3)(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.

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More information

e-pub ahead of print date: 9 December 2010
Published date: January 2011
Keywords: coordination polymers, iron, carboxylate ligands, n ligands, magnetic properties
Organisations: Organic Chemistry: Synthesis, Catalysis and Flow, Chemistry, Faculty of Natural and Environmental Sciences

Identifiers

Local EPrints ID: 351384
URI: http://eprints.soton.ac.uk/id/eprint/351384
ISSN: 1434-1948
PURE UUID: 97790b8c-b4f0-4c9f-aea3-0a291b68616c
ORCID for Tony D. Keene: ORCID iD orcid.org/0000-0003-2297-4327

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Date deposited: 22 Apr 2013 09:49
Last modified: 14 Mar 2024 13:39

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Contributors

Author: Svetlana G. Baca
Author: Irina G. Filippova
Author: Tony D. Keene ORCID iD
Author: Olga Botezat
Author: Iurii L. Malaestean
Author: Helen Stoeckli-Evans
Author: Victor Ch. Kravtsov
Author: Iurii Chumacov
Author: Shi-Xia Liu
Author: Silvio Decurtins

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