Strcutural Analysis of [Fe(ptz)₆)](BF₄)₂under Photo-Excitation –Condensation of Photo-Excited High-Spin Ions–

Abstract

We have performed in situ synchrotron-radiation X-ray powder structural analysis in a spin-crossover complex ([Fe(ptz) 6 )](BF 4 ) 2 : ptz = propyltetrazole) under a photo-excitation with a continuous-wave (CW) green (532 nm) laser at 91 K. The Fe 2+ ions in the Fe(ptz) 6 molecules take the low-spin (LS: S = 0) state at the ground state, and are photo-excited selectively into the high-spin (HS: S = 2) state. When the excitation power P exceeds the critical value, we observed a novel secondary phase which can be ascribed to the condensation of the photo-excited HS ions.