Solid state dehydration condensation of potassium tetrakis(μ-pyrophosphito-P,P′)diplatinate(II) accompanied by the red shift of the luminescence peak

Tadashi Yamaguchi, Yoichi Sasaki, Takeshi Ikeyama, Tohru Azumi, Tasuku Ito

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Yellow crystals of K4[Pt2(pop)4]·2H2O (pop2- = pyrophosphite(2-)) change their color to orange upon dehydration in vacuo or at elevated temperatures with concomitant change in the emission color from green (emission peak at 515 nm) to orange (emission peaks at 520, 570, 670 nm). Thermogravimetric, 31P CP-MAS NMR, electronic and infrared absorption spectral studies indicate that the dehydration is not a simple loss of crystalline waters but involves dehydration condensation between the neighboring complex anions. The original green emission is recovered on dissolving the orange solid in water. Emissions from the dehydrated orange solid are of phosphorescence type (τem ≤ 6 μs). Relative intensity of the three emission peaks depends significantly on dehydration conditions, exciting wavelength and temperature. The orange solid seems to contain various species with different extent and type of condensation. Red shift of the emission peak on dehydration was discussed on the basis of the ligand field theory.

Original languageEnglish
Pages (from-to)233-239
Number of pages7
JournalInorganica Chimica Acta
Volume172
Issue number2
DOIs
Publication statusPublished - 1990 Jun 15

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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