The dinuclear unit μ-aqua-bis(μ-carboxylato)dimetal. X-ray structure and magnetism of cobalt and nickel(II) compounds containing bridging carboxylato groups and a bridging water molecule

Turpeinen, Urho; Hämäläinen, Reijo; Reedijk, Jan

doi:10.1016/s0277-5387(00)80847-5

Cited by 75 publications

(30 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The overall molecular architecture of (I) is similar to that of related compounds (Corkery & Hockless, 1997;Turpeinen et al, 1987;Hagen et al, 1993). The Co1-OW and Co2-OW distances of 2.190 (3) and 2.196 (3) Å , respectively, are the same within experimental uncertainty.…”

Section: Commentmentioning

confidence: 57%

μ₂-Aqua-bis(μ₂-trifluoroaceto-κ²O,O′)bis[bis(pyridine-κN)(trifluoroacetato-κO)cobalt(II)]

Burley¹,

Prior

2005

Acta Cryst E

View full text Add to dashboard Cite

The title complex, [Co2(C2F3O2)4(C5H5N)4(H2O)], crystallizes as a neutral dinuclear molecule with two crystallographically distinct octahedrally coordinated CoII ions in the asymmetric unit. The metal ions are connected by two μ2‐bridging trifluoroacetate ions and a single μ2‐bridging water molecule. Each cobalt(II) coordination sphere is completed by a further trifluoroacetate ion, which coordinates in a monodentate manner, and also by two pyridine molecules, resulting in local cis‐CoN2O4 coordination. The water molecule H atoms participate in intramolecular O—H⋯O hydrogen bonds to the pendant O atoms of the monodentate trifluoroacetate ligands.

show abstract

Section: Commentmentioning

confidence: 57%

μ₂-Aqua-bis(μ₂-trifluoroaceto-κ²O,O′)bis[bis(pyridine-κN)(trifluoroacetato-κO)cobalt(II)]

Burley¹,

Prior

2005

Acta Cryst E

View full text Add to dashboard Cite

show abstract

“…17 Compounds 2a-c have an unprecedented ligand set connecting the two metal ions. Although triply bridged (µ-aqua)di(µ-carboxylato)dimetallic cores have been previously observed for diiron(II), [43][44][45][46][47] dicobalt(II), 44,45,48,49 or dinickel(II) 50-52 complexes, a quadruply bridged di(µ-aqua)di(µ-carboxylato)dimetallic core is an unknown unit in inorganic chemistry. For edge-shared octahedral metal centers, such a bridging unit can be accommodated only by a trans disposition of the bridging carboxylate ligands across the {M 2 (µ-OH 2 ) 2 } n+ core.…”

Section: Discussionmentioning

confidence: 99%

Sterically Hindered Carboxylate Ligands Support Water-Bridged Dimetallic Centers That Model Features of Metallohydrolase Active Sites

et al. 2002

View full text Add to dashboard Cite

The synthesis and characterization of carboxylate-bridged dimetallic complexes are described. By using m-terphenyl-derived carboxylate ligands, a series of dicobalt(II), dicobalt(III), dinickel(II), and dizinc(II) complexes were synthesized. The compounds are [Co(2)(mu-O(2)CAr(Tol))(2)(O(2)CAr(Tol))(2)L(2)] (1), [Co(2)(mu-OH(2))(2)(mu-O(2)CAr(Tol))(2)(O(2)CAr(Tol))(2)L(2)] (2a-c), [Co(2)(mu-OH)(2)(mu-O(2)CAr(Tol))(2)(O(2)CAr(Tol))(2)L(2)] (3), [Ni(2)(mu-O(2)CAr(Tol))(4)L(2)] (4), [Ni(2)(mu-HO...H)(2)(mu-O(2)CAr(Tol))(2)(O(2)CAr(Tol))(2)L(2)] (5), and [Zn(2)(mu-O(2)CAr(Tol))(2)(O(2)CAr(Tol))(2)L(2)] (6), where Ar(Tol)CO(2)H = 2,6-di(p-tolyl)benzoic acid and L = pyridine, THF, or N,N-dibenzylethylenediamine. Structural analysis of these complexes revealed that additional bridging ligands can be readily accommodated within the [M(2)(mu-O(2)CAr(Tol))(2)](2+) core, allowing a wide distribution of M...M distances from 2.5745(6) to 4.0169(9) A. Unprecedented bridging units [M(2)(mu-OH(2))(2)(mu-O(2)CR)(2)](n+) and [M(2)(mu-HO...H)(2)(mu-O(2)CR)(2)](n+) were identified in 2a-c and 5, respectively, in which strong hydrogen bonding accommodates shifts of protons from bridging water molecules toward the dangling oxygen atoms of terminal monodentate carboxylate groups. Such a proton shift along the O...H...O coordinate attenuates the donor ability of the anionic carboxylate ligand, which can translate into increased Lewis acidity at the metal centers. Such double activation of bridging water molecules by a Lewis acidic metal center and a metal-bound general base may facilitate the reactivity of metallohydrolases such as methionine aminopeptidase (MAP).

show abstract

“…[49]. Both complexes are bridged by two acetate groups and additionally in the first case by an acetatohydroxamate group, while in the second case by water [48][49][50].…”

Section: [Co 2 ( -Oac) 2 ( -Aa)(urea)(tmen) 2 ][Otf] (3) [Co 2 ( -H mentioning

confidence: 98%

High-spin Co(II) in monomeric and exchange coupled oligomeric structures: Magnetic and magnetic circular dichroism investigations

Ostrovsky

Tomkowicz

Haase

2009

Coordination Chemistry Reviews

View full text Add to dashboard Cite

The dinuclear unit μ-aqua-bis(μ-carboxylato)dimetal. X-ray structure and magnetism of cobalt and nickel(II) compounds containing bridging carboxylato groups and a bridging water molecule

Cited by 75 publications

References 17 publications

μ₂-Aqua-bis(μ₂-trifluoroaceto-κ²O,O′)bis[bis(pyridine-κN)(trifluoroacetato-κO)cobalt(II)]

μ₂-Aqua-bis(μ₂-trifluoroaceto-κ²O,O′)bis[bis(pyridine-κN)(trifluoroacetato-κO)cobalt(II)]

Sterically Hindered Carboxylate Ligands Support Water-Bridged Dimetallic Centers That Model Features of Metallohydrolase Active Sites

High-spin Co(II) in monomeric and exchange coupled oligomeric structures: Magnetic and magnetic circular dichroism investigations

Contact Info

Product

Resources

About

The dinuclear unit μ-aqua-bis(μ-carboxylato)dimetal. X-ray structure and magnetism of cobalt and nickel(II) compounds containing bridging carboxylato groups and a bridging water molecule

Cited by 75 publications

References 17 publications

μ2-Aqua-bis(μ2-trifluoroaceto-κ2O,O′)bis[bis(pyridine-κN)(trifluoroacetato-κO)cobalt(II)]

μ2-Aqua-bis(μ2-trifluoroaceto-κ2O,O′)bis[bis(pyridine-κN)(trifluoroacetato-κO)cobalt(II)]

Sterically Hindered Carboxylate Ligands Support Water-Bridged Dimetallic Centers That Model Features of Metallohydrolase Active Sites

High-spin Co(II) in monomeric and exchange coupled oligomeric structures: Magnetic and magnetic circular dichroism investigations

Contact Info

Product

Resources

About

μ₂-Aqua-bis(μ₂-trifluoroaceto-κ²O,O′)bis[bis(pyridine-κN)(trifluoroacetato-κO)cobalt(II)]

μ₂-Aqua-bis(μ₂-trifluoroaceto-κ²O,O′)bis[bis(pyridine-κN)(trifluoroacetato-κO)cobalt(II)]