ESR study on gold atoms produced in γ-irradiated MTHF and 10 M NaOH aqueous solutions containing Au+ ions at 77 K

Hase, Hirotomo; Miyatake, Yoko; Miyamoto, Yoshitomo

doi:10.1016/s0009-2614(00)00770-3

Cited by 5 publications

(21 citation statements)

References 10 publications

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“…The very large negative shifts, i.e., −50% were deduced for both matrixes in this study. The values of the relative shifts reported previously for other 1B atoms produced radiation-chemically in organic glasses were about −13% for Ag 0 10 and −16% for Au 0 . A comparison of the present result for Cu 0 with those for Ag 0 and Au 0 leads us to conclude that a larger delocalization of the spin density of Cu 0 onto ligands occurs.…”

Section: Resultssupporting

confidence: 69%

“…Recently Hase and co-workers have initially reported ESR characteristics of Au atoms (Au 0 ) produced radiation-chemically in MTHF and 10 M NaOH aqueous solutions at 77 K. The results show that the hyperfine splittings of Au 0 are smaller than those of the free Au atoms, indicating a dominant van der Waals interaction occurring between Au 0 and ligands.…”

Section: Introductionmentioning

confidence: 99%

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ESR and Optical Properties of Copper Atoms in γ-Irradiated Organic Solutions at 77 K

Miyatake

and²,

Saito³

et al. 2001

J. Phys. Chem. A

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EtOH and MTHF solutions containing Cu + ions are γ-irradiated at 77 K. ESR spectra are attributed, for the first time, to Cu 0 that is produced radiation-chemically by reducing Cu + ions in the solutions at 77 K. A large delocalization of the unpaired spin density of Cu 0 onto ligands is deduced. No evidence for formation of the dimer cation of Cu 0 has been obtained. This is contrary to the case of Ag 0 produced in the solutions containing Ag + ions. The NUV absorption spectrum of Cu 0 is decomposed into five Gaussian bands that are attributed to two types of exciplexes formed between excited Cu 0 and ligands: one associates with Cu + ions as well as solvent molecules, the other consists mainly of solvent molecules. The exciplexes are supposed to be transferred to relaxed states followed by two emission bands, one of which is common to both solvents and the other is characteristic of the solvents. The absorption band at 255 nm is ascribed to a photoionization spectrum of Cu 0 .

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Section: Resultssupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

ESR and Optical Properties of Copper Atoms in γ-Irradiated Organic Solutions at 77 K

Miyatake

and²,

Saito³

et al. 2001

J. Phys. Chem. A

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“…These ESR spectra in our system are quite similar to those due to paramagnetic Cu(II) ions subjected to axial crystal field, which have been reported previously by many researchers in a variety of research fields as well as the biological field [13][14][15][16][17][18][19][20][21][22][23]. The spectra have been attributed to well resolved parallel and unresolved perpendicular components of the hyperfine splitting due to the Cu(II) ions with unpaired electron on 3d 9 in ground state that are subjected to an axial crystal field.…”

Section: Esr Propertiessupporting

confidence: 85%

“…This result shows another evidence that Cu(II) ion is formed in the solutions used in this study. We infer that Cu(II) ion with unpaired electron density on 3d 9 orbital locates in a coordination field of the ligand molecules, showing the axial ESR spectra. In this context, we refer the ligand as solvent molecules.…”

Section: Esr Propertiesmentioning

confidence: 80%

“…As a fundamental research to elucidate the function and effects of metal ions and/or atoms in biological systems, we have been investigating the ESR and optical properties of 1B metal atoms produced radiation-chemically by reducing their mono cations in solid solutions [4][5][6][7][8][9][10][11][12]. In the series of our previous studies, formation of metal atoms, Cu 0 , Ag 0 and Au 0 in irradiated solid solutions containing their mono cations were evidenced by ESR spectra that exhibited duplicate quartets [10], duplicate doublets [8] and quartet [12], respectively.…”

Section: Introductionmentioning

confidence: 99%

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Effects of UV Irradiation on ESR and Optical Properties of Cu(II) Ions in Organic Solid Solutions Containing CuCl at 77 K

Hase¹,

Nakano²,

Saito³

2008

TOMRJ

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The effect of uv irradiation on the solid solutions of MTHF and EtOH containing CuCl with HCl has been investigated. The axial ESR spectra observed before uv irradiation at 73 K for these solutions indicate that Cu(II) ions exist in such a way that the unpaired electron density locates on 3d 9 orbital in the coordination structure associated with the ligand molecules. The new ESR signals observed after uv irradiation is inferred to Cu(II) ions of a transformed ligand structure that is formed via an exciplex "adiabatically". We infer that the new species induced by uv irradiation forms strong covalent bonds between Cu(II) ions and the ligand. The formation of the exciplex has also been evidenced by the absorption and emission properties for the same solutions at 77 K. Three types of emissive exciplexes have been proposed.

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2.32 Gold-centered radicals

Howard

2007

Inorganic Radicals, Metal Complexes and Nonconjugated Carbon Centered Radicals. Part 1

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ESR study on gold atoms produced in γ-irradiated MTHF and 10 M NaOH aqueous solutions containing Au+ ions at 77 K

Cited by 5 publications

References 10 publications

ESR and Optical Properties of Copper Atoms in γ-Irradiated Organic Solutions at 77 K

ESR and Optical Properties of Copper Atoms in γ-Irradiated Organic Solutions at 77 K

Effects of UV Irradiation on ESR and Optical Properties of Cu(II) Ions in Organic Solid Solutions Containing CuCl at 77 K

2.32 Gold-centered radicals

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