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

Burley, J.; Prior, Timothy J.

doi:10.1107/s1600536805019586

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…The O water –H distance was about 2 times lower than the H···O TFMBz distance, confirming that the bridging O atom belongs to water. The two Co–O(9) bond length distances of 2.145(1) and 2.157(1) Å, the Co(1)–O(9)–Co(2) angle of 116.87(5),° and the Co–N py bond lengths in the range 2.138–2.176 Å are comparable to those reported for other aqua bridged binuclear Co II carboxylates. − …”

Section: Resultssupporting

confidence: 75%

Supramolecular Isomerism in Cobalt(II) Coordination Polymers Built from 3,5-Bis(trifluoromethyl)benzoate and 4,4′-Bipyridine

Papi

Rosado

Valcorba

et al. 2022

Crystal Growth & Design

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The reaction of [Co 2 (H 2 O)(TFMBz) 4 (py) 4 ] (1) (TFMBz: 3,5bis(trifluoromethyl)benzoate; py: pyridine) with 4,4′-bipyridine (bpy) in different solvents yields four coordination polymers with unlikely structures but with the same stoichiometry. Three of them contain similar ladder chains consisting of binuclear nodes "Co 2 (TFMBz) 4 ", in which two of the TFMBz ligands show bidentate bridge coordination, double linked to each adjacent node by bpy but packed in different fashions. The different packing affects the compound porosity; thus, [Co 2 (TFMBz) 4 (bpy) 2 ] n (2), precipitated using low-polarity solvents such as supercritical CO 2 (scCO 2 ), n-butyl acetate, or heptane and also in acetonitrile, is microporous, with a surface area of 330 m 2 g −1 , showing the N 2 adsorption/desorption isotherm at 77 K with a gate-opening effect at low relative pressures (P/P 0 = 0.05). The isomer [Co 2 (TFMBz) 4 (bpy) 2 ] n (3), synthesized in ethoxyethanol, presents a surface area of 230 m 2 g −1 . A third chain packing isomer, [Co 2 (TFMBz) 4 (bpy) 2 ] n (4), is obtained in acetone and has only non-interconnected voids. Finally, precursor 1 is combined with bpy in a highly polar solvent such as water to give [Co(TFMBz) 2 (bpy)] n (5). In this isomer, all the carboxylate units act as bidentate bridging ligands, generating chains that are interlinked by bpy, leading to a 2D network, which after packing yields a non-porous structure. The resolution of structures 2−5 is only possible with the recently developed 3D electron diffraction method based on the collection of diffraction patterns on sub-micron-sized single crystals. The variation of magnetic susceptibility as a function of temperature is also measured. Overall, our work provides insightful information on the complex landscape of metal−organic framework solids that are formed by crystallization using different solvent media.

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Section: Resultssupporting

confidence: 75%

Supramolecular Isomerism in Cobalt(II) Coordination Polymers Built from 3,5-Bis(trifluoromethyl)benzoate and 4,4′-Bipyridine

Papi

Rosado

Valcorba

et al. 2022

Crystal Growth & Design

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Tri- (M = Cu II ) and hexanuclear (M = Ni II , Co II ) heterometallic coordination compounds with ferrocene monocarboxylate ligands: Solid-state structures and thermogravimetric, electrochemical and magnetic properties

et al. 2017

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Unusual (μ-aqua)bis(μ-carboxylate) Bridge in Homometallic M(II) (M = Mn, Co and Ni) Two-Dimensional Compounds Based on the 1,2,3,4-Butanetetracarboxylic Acid: Synthesis, Structure, and Magnetic Properties

et al. 2007

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The first coordination compounds of 1,2,3,4-butanetetracarboxylate anion (butca4-) of the formula [M2(butca)(H2O)5]n.2nH2O [M=Mn(II) (1), Co(II) (2), and Ni(II) (3)] were prepared and their X-ray crystal structures and magnetic properties investigated. The three complexes have a very similar two-dimensional structure which consists of (4,4) networks, 1 and 2 being isostructural. The tetracarboxylate ligand acts as a 4-fold connector leading to two-dimensional (4,4) networks of metal atoms, this topology being possible because of its planar conformation. The nodes of these networks are formed by dinuclear motifs which exhibit the unusual (mu-aqua)bis(mu-carboxylate) bridging unit which is analogous to that observed in some molecules of biological interest. The variable-temperature magnetic susceptibility measurements of 1-3 show that 1 and 2 are antiferromagnetically coupled systems whereas 3 exhibits a ferromagnetic behavior. The analysis of the magnetic data of 1-3 through a simple dinuclear model allowed the determination of the values of the magnetic coupling (J) -3.6 (1), -1.2 (2), and +1.47 cm(-1) (3) with the Hamiltonian being defined as H=-JSA.SB. The countercomplementarity between the two bridges (aqua and syn-syn carboxylate) accounts for the trend exhibited by the values of the magnetic coupling in this family.

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

Cited by 5 publications

References 6 publications

Supramolecular Isomerism in Cobalt(II) Coordination Polymers Built from 3,5-Bis(trifluoromethyl)benzoate and 4,4′-Bipyridine

Supramolecular Isomerism in Cobalt(II) Coordination Polymers Built from 3,5-Bis(trifluoromethyl)benzoate and 4,4′-Bipyridine

Tri- (M = Cu II ) and hexanuclear (M = Ni II , Co II ) heterometallic coordination compounds with ferrocene monocarboxylate ligands: Solid-state structures and thermogravimetric, electrochemical and magnetic properties

Unusual (μ-aqua)bis(μ-carboxylate) Bridge in Homometallic M(II) (M = Mn, Co and Ni) Two-Dimensional Compounds Based on the 1,2,3,4-Butanetetracarboxylic Acid: Synthesis, Structure, and Magnetic Properties

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