Transition energy tuning from 3.3 - 1.4 eV in the system Mx[Pt(CN)₄]•mH₂O

Abstract

The electronic transition energies of the Mx[Pt²⁺(CN)₄]•mH₂O compounds, crystallizing in columnar structures, depend strongly on the Pt-Pt distance R in the direction of the columns. R can be varied by substituting M and/or by application of high pressure. Using three different compounds and applying hydrostatic pressures up to 38 kbar it is possible to adjust the emission energy continously from 3.3 to about 1.35 eV. The pressure-induced energy shift is unusually large with values between -320 and -140 cm⁻¹/kbar.