Wydział Chemii

Il’ya A. Gural’skiy

Viktor A. Reshetnikov

Agnieszka Szebesczyk

Elżbieta Gumienna-Kontecka

Andriy I. Marynin

Sergii I. Shylin

Vadim Ksenofontov

Igor O. Fritsky

2015

Journal of Materials Chemistry C

3

4737-4741

10.1039/c5tc00161g

Naukowa

Angielski

Artykuł

Spin crossover complexes represent spectacular examples of molecular switchable materials. We describe a new approach towards homochiral coordination nanoparticles of [Fe(NH₂trz)₃](L-CSA)₂ (NH₂trz = 4-amino-1,2,4-triazole, L-CSA = L-camphorsulfonate) that display an abrupt switch of chiral properties associated with a cooperative spin transition. This is an original method that generates stable and additive-free colloidal solutions of nanoparticles with a spin transition around room temperature. The introduction of a chiral anion to the coordination framework makes these nanoparticles display specific chiro-optical (circular dichroism) properties that are different in high and low spin states. We also illustrate here an effect of the “chiral memory” which is caused by the hysteretic spin transition. In addition, a bistable chiral composite supramolecular system – a [Fe(NH₂trz)₃](L-CSA)₂–CHCl₃ gel – is described here.

http://dx.doi.org/10.1039/c5tc00161g

https://www.rsc.org/