5,10,15,20-Tetrakis(α,α,α,α-o-pivalamidophenyl)porphinatoiron(II) bearing a covalently linked axial imidazole via m-aminobenzoic acid. Synthesis and influence of imidazole basicity on O2-binding affinity

Komatsu, Teruyuki; Furubayashi, Yuka; Nishide, Hiroyuki; Tsuchida, Eishun

doi:10.1016/s0020-1693(99)00346-1

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…These complexes are further classified as to whether the oxygen is bound to one metal atom or two metal atoms. Synthetic chemistry has provided a chemical basis for the structures and physicochemical properties of various active-oxygen species M n –O 2 (M = Fe, ,− Co, − ,, Cu, Cr, and n = 1 or 2). Among those metal complexes, nickel ions ,− are capable of producing similar M n –O 2 species, and thus, nickel-based transition metal complexes may be candidates as an O 2 sorbent in the air separation technology.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Analysis of Oxygen Separation from Air over Ni-Transition Metal Complexes

2011

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The separation of O2 from air over nickel-transition metal complexes has been studied using in situ infrared and Raman spectroscopy, thermogravimetric analysis, volumetric gas sorption, and quantum chemical simulation methods. Exposure of O2 to the solid Ni-transition metal complexes produces a reactive oxygen species at ambient temperatures. The infrared transient responses, during the absorption process, indicate that the ligand groups interact with oxygen, producing both weakly bound and strongly bound oxygen species. The results indicate that the reactive oxygen interacts weakly with the cyanide ligand groups, which are easily removed during the pressure swing absorption/desorption process at 298 K and 689.5 kPa. Temperature-programmed desorption revealed that the oxygen absorbed at the Ni center was bound stronger than the ligand-bound oxygen, evidenced by its removal at 393 K and the disappearance of a hydrogen-bonded species. The results obtained for the absorption/desorption process suggest that the persistence of the activated oxygen and reactivity with the transition metal ligands are an important factor for improving the absorption capacity of the organometallic sorbent. The in situ infrared spectroscopy study reveals the chemical structure of the ligand groups acting as adsorption sites for the reversible O2 uptake of the Ni-transition metal complex; the ligand-O2 interaction is an important factor for air separation sorbent development using organometallic complexes.

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Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Analysis of Oxygen Separation from Air over Ni-Transition Metal Complexes

2011

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Gas separation membranes containing Re6Se8(MeCN)6 2+ cluster-supported cobalt-porphyrin complexes

et al. 2004

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Cellulose nitrate (CN) composite membranes, containing cobalt porphyrin (CoP) complexes self-assembled within nanometer-sized rhenium clusters (ReCoP), have been prepared and their oxygen and nitrogen gas permeabilities were analyzed. The solubility of ReCoP and the characteristics of the corresponding composite membranes were analyzed using a Cahn microbalance, FT-IR spectroscopy, wide-angle X-ray scattering, and differential scanning calorimetry. The nitrogen permeability through the CN composite membranes decreased upon addition of ReCoP and CoP, which implies that the presence of these oxygen carrier complexes affects the structure of the polymer matrix. The oxygen permeability through the composite membranes containing small quantities of ReCoP decreased, but it increased upon increasing the concentration. The oxygen gas transport was affected by the matrix at low ReCoP concentrations, but higher concentrations of ReCoP increased the oxygen permeability as a result of its reversible and specific interactions with oxygen, effectively realizing ReCoP carrier-mediated oxygen transport.

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5,10,15,20-Tetrakis(α,α,α,α-o-pivalamidophenyl)porphinatoiron(II) bearing a covalently linked axial imidazole via m-aminobenzoic acid. Synthesis and influence of imidazole basicity on O2-binding affinity

Cited by 2 publications

References 13 publications

Theoretical and Experimental Analysis of Oxygen Separation from Air over Ni-Transition Metal Complexes

Theoretical and Experimental Analysis of Oxygen Separation from Air over Ni-Transition Metal Complexes

Gas separation membranes containing Re6Se8(MeCN)6 2+ cluster-supported cobalt-porphyrin complexes

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