Delgado Teresa, Tissot Antoine, Besnard Céline, Guénée Laure, Pattison Philip, Hauser Andreas
Départment de Chimie Physique, Université de Genève, 30 Quai Ernest Ansermet, CH-1211 Genève (Switzerland).
Chemistry. 2015 Feb 23;21(9):3664-70. doi: 10.1002/chem.201405405. Epub 2015 Jan 14.
The Hoffman-type coordination compound [Fe(pz)Pt(CN)4]⋅2.6 H2O (pz = pyrazine) shows a cooperative thermal spin transition at around 270 K. Synchrotron powder X-Ray diffraction studies reveal that a quantitative photoinduced conversion from the low-spin (LS) state into the high-spin (HS) state, based on the light-induced excited spin-state trapping effect, can be achieved at 10 K in a microcrystalline powder. Time-resolved measurements evidence that the HS→LS relaxation proceeds by a two-step mechanism: a random HS→LS conversion at the beginning of the relaxation is followed by a nucleation and growth process, which proceeds until a quantitative HS→LS transformation has been reached.
霍夫曼型配位化合物[Fe(pz)Pt(CN)₄]⋅2.6 H₂O（pz = 吡嗪）在约270 K时表现出协同热自旋转变。同步辐射粉末X射线衍射研究表明，基于光诱导激发自旋态捕获效应，在微晶粉末中于10 K时可实现从低自旋（LS）态到高自旋（HS）态的定量光致转变。时间分辨测量证明，HS→LS弛豫通过两步机制进行：弛豫开始时HS随机向LS转变，随后是成核和生长过程，该过程持续进行直至达到HS→LS的定量转变。
