Effect of adlayer structure on the host-guest recognition between calcium and crown-ether-substituted phthalocyanine arrays on Au single-crystal surfaces

Soichiro Yoshimoto, Koji Suto, Akinori Tada, Nagao Kobayashi, Kingo Itaya

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

Adlayers of 15-crown-5-ether-substituted cobalt(II) phthalocyanine (CoCRPc) were prepared by immersion of either Au(111) or Au(100) substrate into benzene-ethanol (9:1 v/v) mixed solutions containing CoCRPc. In situ STM imaging was carried out after transferring the CoCRPc-modified Au crystals into aqueous HClO4 solution. The packing arrangement of the CoCRPc array on Au(111) was determined to be p(8 × 4√3R - 30°), and the internal structure was clearly observed by high-resolution STM. Two adlayer structures of CoCRPc, (8 × 9) and (4√5 × 4√5)R26.7°, were found on the Au(100)-(1 × 1) terrace. In the presence of 1 mM Ca2+, two Ca2+ ions were trapped in two diagonally located 15-crown-5-ether moieties of each CoCRPc molecule on Au(111), whereas encapsulation of Ca 2+ ions was not seen in the CoCRPc arrays on the Au(100)-(1 × 1) surface. The present study demonstrates that the relationship between crown moieties of CRPc and the underlying Au lattice is important in the trapping of Ca2+ ions in crown rings.

Original languageEnglish
Pages (from-to)8020-8027
Number of pages8
JournalJournal of the American Chemical Society
Volume126
Issue number25
DOIs
Publication statusPublished - 2004 Jun 30

ASJC Scopus subject areas

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

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