Zusammenfassung
Y₂[Pt(CN)₄]₃•2H₂O (YCP) crystallizes in a columnar structure type with a mean in-chain Pt-Pt distance of R = 3.18 Å. At T(c) = (218.5 ± 1) K YCP undergoes a first order phase transformation which is investigated spectroscopically (polarized emission) and thermodynamically (specific heat and differential thermal analysis). It is possible to record polarized emission spectra from the high ...
Zusammenfassung
Y₂[Pt(CN)₄]₃•2H₂O (YCP) crystallizes in a columnar structure type with a mean in-chain Pt-Pt distance of R = 3.18 Å. At T(c) = (218.5 ± 1) K YCP undergoes a first order phase transformation which is investigated spectroscopically (polarized emission) and thermodynamically (specific heat and differential thermal analysis). It is possible to record polarized emission spectra from the high temperature phase (phase I) T > T(c), the low temperature phase (phase II) T < T(c), and the supercooled phase I. From the spectroscopic data we deduce a Pt-Pt distance reduction (at T(c)) of ΔR = (-0.04 ± 0.005) Å. The enthalpy of the transition from phase I to phase II is about +1500 J/mole.
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