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Solid state dehydration condensation of potassium tetrakis(μ-pyrophosphito-P,P′)diplatinate(II) accompanied by the red shift of the luminescence peak by Tadashi Yamaguchi; Yoichi Sasaki; Takeshi Ikeyama; Tohru Azumi; Tasuku Ito is a Chemistry article available to read on EtoBox.

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Yellow crystals of K4 [Pt2(pop)4] \*2Hz0 (pop'-= pyrophosphite(2-)) change their color to orange upon dehydration in vacua or at elevated temperatures with concomitant change in the emission color from green (emission peak at 5 15 nm) to orange (emission peaks at 520, 570, 670 mn). 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 (7, 5 6 ps). 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. yellow solid despite the apparent color difference. Gray and coworkers indicated that the greenish salt is contaminated with a small amount of oxidized species, and described a stan

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Author

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

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0020-1693)

Published

1990

Language

EN

Field

Chemistry (Physical Sciences)