NDLI: Structural versatility in cobalt(ii) complexes with 1,2,4,5-benzenetetracarboxylic acid (H4bta) and 4,4′-bipyridine-N,N′-dioxide (dpo)

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Structural versatility in cobalt(ii) complexes with 1,2,4,5-benzenetetracarboxylic acid (H₄bta) and 4,4′-bipyridine-N,N′-dioxide (dpo)

Content Provider	Royal Society of Chemistry (RSC)
Author	Lloret, Francesc Ruiz-Pérez, Catalina Julve, Miguel Fabelo, Oscar Pasán, Jorge
Copyright Year	2007
Abstract	Four new high-spin cobalt(II) complexes of formula [Co(H2O)6](H2bta)·dpo·4H2O (1), [{Co(H2O)4(dpo)}2(bta)]·4H2O·(2), [Co(H2O)2)(dpo)2(H2bta)]n (3) and [Co(H2O)3(dpo)(bta)1/2]n (4) (H4bta = 1,2,4,5-benzenetetracarboxylic acid and dpo = 4,4′-bipyridine-N,N′-dioxide) have been synthesized and their structures solved by single crystal X-ray diffraction methods. Compound 1 is an ionic salt whose structure is made up of [Co(H2O)6]2+ cations, H2bta2− anions, uncoordinated dpo groups and crystallization water molecules, which are linked by extensive hydrogen bonds to afford a three-dimensional network. The structure of 2 consists of bta-bridged dinuclear cobalt(II) complexes where four coordinated water molecules and a terminally bound dpo ligand complete the six coordination around each cobalt atom. The bta ligand in 2 adopts the bis-monodentate bridging mode through two trans carboxylate-oxygen atoms, the intramolecular cobalt–cobalt distance being 11.46(2) Å. The structure of 3 is constituted by uniform chains of cobalt(II) ions bridged by the dideprotonated H2bta2− species through two trans carboxylate-oxygen atoms. Two coordinated water molecules and two terminally bound dpo ligands achieve the six coordination around each cobalt atom. The intrachain cobalt–cobalt separation is 11.387(1) Å. The structure of 4 consists of corrugated layers of cobalt(II) ions bridged by bis-monodentate dpo and bta4− ligands, (through two trans carboxylate-oxygen atoms), three coordinated water molecules in a fac arrangement achieving the six-coordination around each cobalt atom. The investigation of the magnetic behaviour of 2–4 in the temperature range 1.9–300 K shows the occurrence of very weak antiferromagnetic interactions between the high-spin cobalt(II) ions, the strong decrease of χMT upon cooling which is observed for this family of complexes ligands being mainly due to the depopulation of the higher energy Kramers doublets of the high-spin octahedral cobalt(II) centers.
Starting Page	815
Ending Page	827
Page Count	13
File Format	HTM / HTML PDF
ISSN	14668033
Volume Number	9
Issue Number	9
Journal	CrystEngComm
DOI	10.1039/b706035c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	X-ray crystallography Antiferromagnetism Ligand Kramers Cobalt Water of crystallization Hydrogen bond
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics Materials Science

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Anion dependent structural diversity in cobalt(ii) complexes of 4,4′-bipyridine-N,N′-dioxide

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Poly[[diaqua(μ-4,4′-bipyridine N,N′-dioxide-κ2 O:O′)(μ-terephthalato-κ2 O 1:O 4)cobalt(II)] 4,4′-bipyridine N,N′-dioxide monosolvate]

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Structural versatility in cobalt(ii) complexes with 1,2,4,5-benzenetetracarboxylic acid (H₄bta) and 4,4′-bipyridine-N,N′-dioxide (dpo)

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