Structural investigation of the high spin→low spin relaxation dynamics of the porous coordination network [Fe(pz)Pt(CN)4]⋅2.6 H2O

Teresa Delgado; Antoine Tissot; Céline Besnard; Laure Guénée; Philip Pattison; Andreas Hauser

doi:10.1002/chem.201405405

Structural investigation of the high spin→low spin relaxation dynamics of the porous coordination network [Fe(pz)Pt(CN)4]⋅2.6 H2O

Chemistry. 2015 Feb 23;21(9):3664-70. doi: 10.1002/chem.201405405. Epub 2015 Jan 14.

Authors

Teresa Delgado¹, Antoine Tissot, Céline Besnard, Laure Guénée, Philip Pattison, Andreas Hauser

Affiliation

¹ Départment de Chimie Physique, Université de Genève, 30 Quai Ernest Ansermet, CH-1211 Genève (Switzerland).

PMID: 25589506
DOI: 10.1002/chem.201405405

Abstract

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.

Keywords: LIESST; X-ray diffraction studies; cooperative effects; organic electronics; relaxation dynamics; spin crossover.