ChemInform Abstract: Low‐Spin Six‐Coordinate Cobalt(II) Complexes. A Solution Study of Tris(violurato)cobaltate(II) Ions

Garcı́a-España, Enrique; Ballester, Maria-Jesus; Lloret, Francisco; Moratal, José M.; Faus, Juan; Bianchi, Antonio

doi:10.1002/chin.198815310

Cited by 2 publications

(3 citation statements)

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“…has been fully described elsewhere. 20 The acquisition of the electromotive force (emf) data was performed with the computer program PASAT. 21 The reference electrode was an Ag/ AgCl electrode in saturated KCl solution.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Coordination Chemistry of Cu²⁺ Complexes of Small N-Alkylated Tetra-azacyclophanes with SOD Activity

et al. 2018

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A new tetraaza-pyridinophane macrocycle (L1) N-alkylated with two isopropyl and one methyl groups symmetrically disposed has been prepared and its behavior compared with those of the unsubstituted pyridinophane (L3) and the related compound with three methyl groups (L2). The protonation studies show that, first, a proton binds to the central methylated amine group of L1, while, second protonation leads to a reorganization of the protons that are at this stage attached to the lateral isopropylated amines. The X-ray structure of [HL1] agrees with the UV-vis and NMR studies as well as with the results of DFT calculations. The stability of the Cu complexes decreases on increasing the bulkiness of the alkyl substituents of the amine groups. The crystal structures of [CuL1Cl](ClO) and [CuL1(HO)](ClO)·HO show square pyramidal coordination geometries with the ligands disposed in a bent L-shaped conformation. Kinetic studies indicate that the rates of both complexation and ligand dissociation decrease with the bulkiness of the substituents, so that the stability changes are surely the results of compensating effects, complex formation dominating over complex dissociation. The pH dependence of the rate constants for complex formation cannot be explained by consideration of rapid pre-equilibria involving the different protonated forms of the ligand, and it has been interpreted in terms of a mechanism involving an acid-base equilibrium for a reaction intermediate. NBT SOD studies show that the Cu complex of the bulkiest L1 ligand is the one having the highest activity (IC = 0.26(5) μM, k = 13.7 × 10 M s) which can be associated with the poorer σ-donor ability of the tertiary amino groups, and the rigidity of the system, caused by the bulky isopropyl groups.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Coordination Chemistry of Cu²⁺ Complexes of Small N-Alkylated Tetra-azacyclophanes with SOD Activity

et al. 2018

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“…The experimental procedure (buret, potentiometer, cell, stirrer, microcomputer, etc.) has been fully described elsewhere . The acquisition of the emf data was performed with the computer program PASAT .…”

Section: Experimental Sectionmentioning

confidence: 99%

“…has been fully described elsewhere. 27 The acquisition of the emf data was performed with the computer program PASAT. 28 The reference electrode was a Ag/AgCl electrode in saturated KCl solution.…”

Section: ■ Introductionmentioning

confidence: 99%

Boehmite Supported Pyrene Polyamine Systems as Probes for Iodide Recognition

et al. 2013

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New organic–inorganic fluorescent probes made by attaching the tripodal polyamine (tris(2-aminoethyl))amine (tren), propylamine, or diethylenetriamine functionalized with pyrene as a fluorophore to an γ-aluminum oxohydroxide matrix have been prepared and studied both in solution and supported on the surface of boehmite nanoparticles. Both kinds of systems have been revealed as sensitive and selective fluorescence turn-off chemosensors for iodide in aqueous solution with an estimated detection limit that reaches 36 ppb. The recognition characteristics and photophysical properties of these molecules are essentially preserved when they are grafted to the surface of the particles. Since the nanoparticles are stable over a wide pH window and they can be easily recovered by centrifugation and filtration, these systems present the advantage that can be repeatedly used for the detection of iodide.

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ChemInform Abstract: Low‐Spin Six‐Coordinate Cobalt(II) Complexes. A Solution Study of Tris(violurato)cobaltate(II) Ions

Cited by 2 publications

References 1 publication

Coordination Chemistry of Cu²⁺ Complexes of Small N-Alkylated Tetra-azacyclophanes with SOD Activity

Coordination Chemistry of Cu²⁺ Complexes of Small N-Alkylated Tetra-azacyclophanes with SOD Activity

Boehmite Supported Pyrene Polyamine Systems as Probes for Iodide Recognition

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ChemInform Abstract: Low‐Spin Six‐Coordinate Cobalt(II) Complexes. A Solution Study of Tris(violurato)cobaltate(II) Ions

Cited by 2 publications

References 1 publication

Coordination Chemistry of Cu2+ Complexes of Small N-Alkylated Tetra-azacyclophanes with SOD Activity

Coordination Chemistry of Cu2+ Complexes of Small N-Alkylated Tetra-azacyclophanes with SOD Activity

Boehmite Supported Pyrene Polyamine Systems as Probes for Iodide Recognition

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Coordination Chemistry of Cu²⁺ Complexes of Small N-Alkylated Tetra-azacyclophanes with SOD Activity

Coordination Chemistry of Cu²⁺ Complexes of Small N-Alkylated Tetra-azacyclophanes with SOD Activity