Platinum chalcogenido MCM-41 analogues. High hexagonal order in mesostructured semiconductors based on Pt2+ and [Ge4Q10]4- (Q = S, Se) and [Sn4Se10]4- adamantane clusters

Pantelis N. Trikalitis, Krishnaswamy K. Rangan, Mercouri G. Kanatzidis

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

Highly periodic hexagonal honeycombs of platinum-germanium chalcogenide and platinumtin selenide frameworks were prepared by linking corresponding [Ge4Q10]4- (Q = S, Se) and [Sn4Se10]4- clusters with Pt2+ ions. The non-oxidic honeycombs designated as CnPyPtGeQ and CnPyPtSnSe were templated by the lyotropic liquid-crystalline phase of alkylpyridinium surfactant [CnH2n+1NC5H5]Br (CnPyBr) with n= 12, 14, 16, 18, 20, and 22. Although the materials are amorphous at the microscale, they have crystalline mesoporosity with well-ordered and aligned surfactant-filled cylindrical pores. In addition to high mesoscopic order, the pore-pore separation is adjustable with the surfactant chain length (i.e., value of n). The quality of these materials, as judged by the degree of hexagonal order, rivals or exceeds that reported for the highest quality MCM-41 silicates. The materials have the lowest band gap reported so far for mesostructured chalcogenides solids, in the range 1.5 < Eg < 2.3 eV. The CnPyPtGeS analogues show intense photoluminescence at 77 K when excited with light above the band gap.

Original languageEnglish
Pages (from-to)2604-2613
Number of pages10
JournalJournal of the American Chemical Society
Volume124
Issue number11
DOIs
Publication statusPublished - Mar 20 2002

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ASJC Scopus subject areas

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

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