The tellurophosphate K4P8Te4: Phase-change properties, exfoliation, photoluminescence in solution and nanospheres

In Chung, Jung Hwan Song, Myung Gil Kim, Christos D. Malliakas, Angela L. Karst, Arthur J. Freeman, David P. Weliky, Mercouri G. Kanatzidis

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


We describe the inorganic polymer K4P8Te4 which is soluble, giving solutions that exhibit white emission upon 355 nm laser irradiation. An indirect band gap semiconductor (Eg ≈ 1.4 eV), K4P8Te4 crystallizes in the space group P2 1/m, with a = 6.946(1) Å, b = 6.555(1) A, c = 9.955(2) Å, and β = 90.420(3)° at 173(2) K. The compound features infinite chains of [P8Te44-] with covalent P-Te bonding and exhibits reversible crystal-glass phase-change behavior. When deposited from solution, the material forms highly crystalline K4P 8Te4 nanospheres. The thermal analysis, FT-IR, UV-vis diffuse reflectance, 31P magic angle spinning solid-state NMR spectroscopy, and pair distribution function (PDF) analysis for the crystal and glass forms and ab initio electronic structure calculations by the screened-exchange local density function approximation are also reported. Speciation of K4P8Te4 in solution studied with 31P solutionstate NMR spectroscopy, electrospray ionization mass spectrometry, and PDF analysis indicate exfoliation of [P8Te 44-] chains followed by rearrangement into molecular species.

Original languageEnglish
Pages (from-to)16303-16312
Number of pages10
JournalJournal of the American Chemical Society
Issue number44
Publication statusPublished - Nov 27 2009

ASJC Scopus subject areas

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

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