1. Cobalt 1992–1993

Davies, Michael B.

doi:10.1016/0010-8545(96)01268-4

Cited by 10 publications

(1 citation statement)

References 307 publications

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“…The Co1 coordination environment contained four carboxylate oxygen atoms from four µ 4 -L 2− blocks and two oxygen atoms from trans aqua ligands (Figure 1a). Such an arrangement of cobalt (II) center is relatively common in carboxylate-based coordination compounds obtained in an aqueous medium [42,54].…”

Section: Resultsmentioning

confidence: 99%

Structural and Thermal Investigations of Co(II) and Ni(II) Coordination Polymers Based on biphenyl-4,4′-dioxydiacetate Linker

et al. 2021

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Two coordination polymers, [Co(µ4-L)(H2O)2]n (1) and [Ni(µ-L)(H2O)4]n (2), were solvothermally assembled from the corresponding metal(II) chlorides and biphenyl-4,4-dioxydiacetic acid (H2L) as a flexible dicarboxylate linker. The cobalt(II) compound 1 featured a layer-pillared 3D metal-organic network with a cds topology, while the nickel(II) derivative 2 represented a linear chain 1D coordination polymer with a 2C1 topology. The µ4− and µ-L2− linkers exhibited different denticity and coordination modes in the synthesized compounds, thus contributing to their structural diversity. The dimensionality of 1 and 2 had an influence on their thermal stability and decomposition processes, which were investigated in detail by TG-DSC and TG-FTIR methods. Thermal decomposition products of coordination polymers were also analyzed by PXRD, confirming the formation of Co3O4/CoO and NiO as final materials. The obtained compounds broaden a family of coordination polymers assembled from flexible dicarboxylate linkers.

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Section: Resultsmentioning

confidence: 99%

Structural and Thermal Investigations of Co(II) and Ni(II) Coordination Polymers Based on biphenyl-4,4′-dioxydiacetate Linker

et al. 2021

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ChemInform Abstract: Cobalt 1992‐1993

Davies

1996

ChemInform

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Nitroxide Radicals Interacting with Polyamine‐Phenolic Ligands and Their Metal Complexes

et al. 2004

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We have analyzed the interactions of a series of nitroxide radicals with ligands containing a phenol moiety coupled with different polyamine fragments, and their Cu-II and Zn-II complexes, by EPR experiments. Nitroxide radicals are good mimics of the properties of pollutant molecules, e.g., organic compounds having different polarities and charges, surfactants, and polyaromatics. Charged, polar, and low-polarity sites in the ligands and complexes are all available for interactions; in particular, the ability to entrap the radicals in a vice-like structure, by the formation of phenyl sandwich complexes, determines the type of selective interaction that occurs when a chain or planar aromatic structure is present. For closely packed complexes, Zn-II has a cooperative effect in the interaction with the radical; it allows both the entrance of low-polarity radicals at the low-polarity sites of the complex and the interactions of polar or charged radicals at the polar sites of the complexes. Conversely, Cull coordinates to the amino groups of the ligands and blocks the entry of radicals, which, thus, impedes their insertion into the structure of the complexes. The opposite behavior, with respect to that of Cu-II and Zn-II, was found for the complexes that have more open structures. The complexes that have cyclic ligands exhibit a poor ability to interact with radicals, but, for the ligands in the absence of the coordinating metals, the interactions are significantly enhanced as a result of the entrance of the radicals into the cyclic structures. In all cases, stronger interactions occur when both hydrophilic and hydrophobic sites are involved. The neutral-surfactant probe forms aggregates mainly with the cooperative effect of the copper complexes. UV/Vis measurements confirmed the results obtained by EPR and indicate that weak interactions occur between the radicals and the complexes or ligands; they also confirmed the formation of 1:1 adducts

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1. Cobalt 1992–1993

Cited by 10 publications

References 307 publications

Structural and Thermal Investigations of Co(II) and Ni(II) Coordination Polymers Based on biphenyl-4,4′-dioxydiacetate Linker

Structural and Thermal Investigations of Co(II) and Ni(II) Coordination Polymers Based on biphenyl-4,4′-dioxydiacetate Linker

ChemInform Abstract: Cobalt 1992‐1993

Nitroxide Radicals Interacting with Polyamine‐Phenolic Ligands and Their Metal Complexes

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