Hydride ion as photoelectron donor in microporous crystal

Satoru Matsuishi; Katsuro Hayashi; Masahiro Hirano; Hideo Hosono

doi:10.1021/ja053568m

Hydride ion as photoelectron donor in microporous crystal

Satoru Matsuishi, Katsuro Hayashi, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journal › Article › peer-review

51 Citations (Scopus)

Abstract

Atomic hydrogen (H⁰) and trapped electrons generated by UV illumination (λ _∼ 330 nm) at 4 K were observed using electron paramagnetic resonance (EPR) in a 12CaO·7Al₂O₃ (C12A7) crystal heated in a hydrogen atmosphere. The concentration ratio of generated H⁰ to the electrons encaged in the subnanometer-sized cages of C12A7 (F⁺ centers) is almost 1:1, providing direct evidence that a hydride ion, H^-, accommodated in the cage by the heat treatment was dissociated to a pair of an H⁰ and an electron by a UV photon: H^- → H⁰ + e^- (F⁺). After annealing at 300 K, H⁰ was completely annihilated, while _∼60% of the trapped electrons survived. The remaining electrons can hop between neighboring cages and give electrical conductivity to C12A7. The hyperfine splitting of the EPR spectrum of H⁰ in C12A7 (48.6 mT) is 4% smaller than that of the neutral hydrogen atom (50.6 mT), implying that H⁰ is trapped at the interstitial sites among the cages.

Original language	English
Pages (from-to)	12454-12455
Number of pages	2
Journal	Journal of the American Chemical Society
Volume	127
Issue number	36
DOIs	https://doi.org/10.1021/ja053568m
Publication status	Published - Sept 14 2005
Externally published	Yes

All Science Journal Classification (ASJC) codes

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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10.1021/ja053568m

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title = "Hydride ion as photoelectron donor in microporous crystal",

abstract = "Atomic hydrogen (H0) and trapped electrons generated by UV illumination (λ ∼ 330 nm) at 4 K were observed using electron paramagnetic resonance (EPR) in a 12CaO·7Al2O3 (C12A7) crystal heated in a hydrogen atmosphere. The concentration ratio of generated H0 to the electrons encaged in the subnanometer-sized cages of C12A7 (F+ centers) is almost 1:1, providing direct evidence that a hydride ion, H-, accommodated in the cage by the heat treatment was dissociated to a pair of an H0 and an electron by a UV photon: H- → H0 + e- (F+). After annealing at 300 K, H0 was completely annihilated, while ∼60% of the trapped electrons survived. The remaining electrons can hop between neighboring cages and give electrical conductivity to C12A7. The hyperfine splitting of the EPR spectrum of H0 in C12A7 (48.6 mT) is 4% smaller than that of the neutral hydrogen atom (50.6 mT), implying that H0 is trapped at the interstitial sites among the cages.",

author = "Satoru Matsuishi and Katsuro Hayashi and Masahiro Hirano and Hideo Hosono",

year = "2005",

month = sep,

day = "14",

doi = "10.1021/ja053568m",

language = "English",

volume = "127",

pages = "12454--12455",

journal = "Journal of the American Chemical Society",

issn = "0002-7863",

publisher = "American Chemical Society",

number = "36",

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TY - JOUR

T1 - Hydride ion as photoelectron donor in microporous crystal

AU - Matsuishi, Satoru

AU - Hayashi, Katsuro

AU - Hirano, Masahiro

AU - Hosono, Hideo

PY - 2005/9/14

Y1 - 2005/9/14

N2 - Atomic hydrogen (H0) and trapped electrons generated by UV illumination (λ ∼ 330 nm) at 4 K were observed using electron paramagnetic resonance (EPR) in a 12CaO·7Al2O3 (C12A7) crystal heated in a hydrogen atmosphere. The concentration ratio of generated H0 to the electrons encaged in the subnanometer-sized cages of C12A7 (F+ centers) is almost 1:1, providing direct evidence that a hydride ion, H-, accommodated in the cage by the heat treatment was dissociated to a pair of an H0 and an electron by a UV photon: H- → H0 + e- (F+). After annealing at 300 K, H0 was completely annihilated, while ∼60% of the trapped electrons survived. The remaining electrons can hop between neighboring cages and give electrical conductivity to C12A7. The hyperfine splitting of the EPR spectrum of H0 in C12A7 (48.6 mT) is 4% smaller than that of the neutral hydrogen atom (50.6 mT), implying that H0 is trapped at the interstitial sites among the cages.

AB - Atomic hydrogen (H0) and trapped electrons generated by UV illumination (λ ∼ 330 nm) at 4 K were observed using electron paramagnetic resonance (EPR) in a 12CaO·7Al2O3 (C12A7) crystal heated in a hydrogen atmosphere. The concentration ratio of generated H0 to the electrons encaged in the subnanometer-sized cages of C12A7 (F+ centers) is almost 1:1, providing direct evidence that a hydride ion, H-, accommodated in the cage by the heat treatment was dissociated to a pair of an H0 and an electron by a UV photon: H- → H0 + e- (F+). After annealing at 300 K, H0 was completely annihilated, while ∼60% of the trapped electrons survived. The remaining electrons can hop between neighboring cages and give electrical conductivity to C12A7. The hyperfine splitting of the EPR spectrum of H0 in C12A7 (48.6 mT) is 4% smaller than that of the neutral hydrogen atom (50.6 mT), implying that H0 is trapped at the interstitial sites among the cages.

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U2 - 10.1021/ja053568m

DO - 10.1021/ja053568m

M3 - Article

C2 - 16144369

AN - SCOPUS:24744437533

SN - 0002-7863

VL - 127

SP - 12454

EP - 12455

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

IS - 36

ER -

Hydride ion as photoelectron donor in microporous crystal

Abstract

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