Conversion of Ag0 into Ag2+ in <i>γ</i>-Irradiated Organic Solid Solutions at 77 K as Studied by ESR

Matsuura, Kaoru; Hase, Hirotomo; Arai, Shigeyoshi; Miyatake, Yoko; Hoshino, Mikio

doi:10.1246/bcsj.72.363

Cited by 4 publications

(15 citation statements)

References 21 publications

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“…In this case, the conversion from Ag 0 to Ag 2 + amounted to about 30% for the sample stored in liquid nitrogen for 5 days. 19 Natural copper has two isotopes, 63 Cu (69%) and 65 Cu (31%), both of which have a nuclear spin of 3/2, and, in free state, have magnetic moments of 2.2233 and 2.3817 nuclear magnetons, respectively. Thus the ESR of Cu 0 exhibits duplicate hyperfine quartets, resulting in an eight-line spectrum.…”

Section: Resultsmentioning

confidence: 99%

“…This is in contrast to the case of Ag 0 in EtOH and MTHF solutions where ESR spectra are due to the dimer cation, Ag 2 + was clearly observed as well as Ag 0 in γ-irradiated solutions at 77 K with dose as low as 33 kGy. In this case, the conversion from Ag 0 to Ag 2 + amounted to about 30% for the sample stored in liquid nitrogen for 5 days 1 ESR spectra at 73 K of Cu 0 produced in γ-irradiated EtOH (A) and MTHF (B) solutions containing 10 -1 M CuCl.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

“…On annealing to 77 K, Ag 0 is partly desolvated to give rise to a reduction of the isotropic hyperfine coupling, indicating a new solvation configuration in which one of the four water molecules reorients one hydrogen toward Ag 0 . 14 The dimer cation, Ag 2 + was found to form by the tunneling reaction between Ag 0 and Ag + ion at 77 K. [16][17][18][19] The optical properties of Ag 0 were previously studied in 2-methyltetrahydrofuran (MTHF), ethanol (EtOH), and aqueous solutions. [20][21][22] The absorption spectra of Ag 0 in EtOH and MTHF solutions consisted of the UV and NUV bands, each of which was composed of at least two bands.…”

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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…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%

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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Optical Properties of Gold Atoms in γ-Irradiated Organic Solid Solutions at 77 K

et al. 2004

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Au0 atoms were produced via the electron capture of Au+ ions in γ-irradiated solid solutions of MTHF at 77 K. The optical absorption bands observed in the regions of UV and NUV are ascribed to Au0. The steady-state emission and excitation spectra were measured by photoexcitation at 73 K before and after γ-irradiation of the solid solutions containing [Au+] ions. The two-dimensional time-resolved emission spectra were also investigated by photoexcitation at λexc = 337, 380, and 420 nm by using an N2 laser and dye lasers. A set of five emission bands of 385, 430, 480, 520, and 580 nm and another set of emission bands at 456, 482, 484, and 520 nm were observed. The latter set of emission bands showed such characteristic structures as the mirror image of the absorption bands of Au0 in the rare gas matrixes. The emission band at 430 nm observed before γ-irradiation was confirmed to be phosphorescence due to Au+ with a lifetime of about 625 ms. A part of the emission band of 385 nm observed after γ-irradiation was also due to phosphorescence consisting of two components with lifetimes of 146 and 461 ms. Three types of exciplexes (Au+·Ln)*, (Au0·Ln...Au+)*, (Au0·Ln)*, and the excited gold atom (Au0)* are proposed for all the emission bands including phosphorescence. The excited gold atoms in 2P1/2 and 2P3/2 states participate mainly in the formation of these emissive exciplexes. The formation mechanism for these species is also presented.

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Conversion of Ag0 into Ag2+ in γ-Irradiated Organic Solid Solutions at 77 K as Studied by ESR

Cited by 4 publications

References 21 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

Optical Properties of Gold Atoms in γ-Irradiated Organic Solid Solutions at 77 K

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