Emission and excitation spectra of silver atoms in γ-irradiated aqueous, ethanol, and 2-methyltetrahydrofuran solutions at 77 K

Hase, Hirotomo; Miyatake, Yoko; Hoshino, Mikio; Taguchi, Mitsumasa; Arai, Shigeyoshi

doi:10.1016/s0969-806x(96)00107-7

Cited by 11 publications

(27 citation statements)

References 26 publications

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“…f ESR lines due to two isotopes are situated too closely for the line widths to be determined. are given by the following Breit-Rabi equation: 1,21 where a is the hyperfine coupling constant; g I is the gyromagnetic ratio of the nucleus; m is the magnetic quantum number of the total moment of the atom F ) J + I, where J and I are the moments of the electrons and of the nucleus, respectively; and x ) (g J -g I ) H/ha, where g J is the g-value of the electron shell. According to the Zeeman levels of the hyperfine structure of Cu 0 , 4 four groups in ascending order of magnetic field correspond to transitions (F ) 1, m ) 1) f (2, 2), (1, 0) f (2, 1), (1, -1) f (2, 0), and (2, -2) f (2, -1), respectively.…”

Section: Resultsmentioning

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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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%

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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“…The calibration of g-value was carried out with an Mn 2+ standard sample that was immersed in the Dewar together with the irradiated samples. The experimental apparatus and procedures for the optical absorption measurements at 77 K were described elsewhere [4,5]. The measurements of the emission and excitation spectra were carried out at 77 K with use of a Hitachi fluorescence spectrometer (model F-4500) for the same samples subsequently after ESR measurements.…”

Section: Methodsmentioning

confidence: 99%

“…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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“…All samples were prepared as described previously. , Either AgNO 3 or AgClO 4 of various concentrations was quickly dissolved in ethanol and MTHF at the room temperature. MTHF was first distilled fractionally and then dried over Na and K alloy.…”

Section: Methodsmentioning

confidence: 99%

“…There has been a limited number of optical studies on Ag 0 produced via the radiation chemical reduction of silver ions (Ag + ) in organic solutions at low temperatures except for ESR studies . − Therefore, we have been investigating the optical properties of Ag 0 produced by γ-irradiation at 4 or 77 K in aqueous, ethanol, and 2-methyltetrahydrofuran (MTHF) solutions containing Ag + of 0.015 M and have already reported the results of the optical absorption properties and the steady-state emission and excitation spectra . We observed the two intense emission bands centered at nearly 500 and 600 nm in both ethanol and MTHF solutions but no emission band in the aqueous solutions.…”

Section: Introductionmentioning

confidence: 96%

Emission Characteristics of Silver Atoms in γ−Irradiated Organic Solid Solutions at 77 K

et al. 1998

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Ag0 atoms were produced via the electron capture of Ag+ ions in γ-irradiated solid solutions of ethanol and MTHF at 77 K. The 2-dimensional time-resolved fluorescence spectra together with the steady-state fluorescence spectra and excitation spectra were measured by photoexcitation of Ag0 produced in the γ-irradiated solid solutions. The steady-state measurements have revealed the existence of two main emission bands at nearly 500 and 580 nm. The intensity of the 500 nm band increased and that of the 580 nm band concomitantly decreased with increasing concentration of Ag+ in both solutions. The time-resolved observation has shown that the 500 nm band consists of three components of different lifetimes (τ). The main component with τ ∼ 1 μs is attributed to the exciplex (Ag0·Ag+)*, the one with τ ∼ 2 μs, to the similar exciplex which is weakly coupled to solvent molecules, and the third one with τ ∼ 3 ns, to Ag0* trapped in a large cavity where Ag0 scarcely interacts with solvent molecules. The 580 nm band grows at about 0.5−1 μs and decays with a long lifetime, i.e., about 50 μs in ethanol or 40 μs in MTHF. The band is attributed to the exciplex (Ag0·L n )*, where L n denotes n solvent molecules.

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Emission and excitation spectra of silver atoms in γ-irradiated aqueous, ethanol, and 2-methyltetrahydrofuran solutions at 77 K

Cited by 11 publications

References 26 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

Emission Characteristics of Silver Atoms in γ−Irradiated Organic Solid Solutions at 77 K

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