Hydride ion as photoelectron donor in microporous crystal

Satoru Matsuishi, Katsuro Hayashi, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticle

45 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 languageEnglish
Pages (from-to)12454-12455
Number of pages2
JournalJournal of the American Chemical Society
Volume127
Issue number36
DOIs
Publication statusPublished - Sep 14 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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