Spin-transition frameworks based on bistetrazole and triazine ligands

Abstract

The present thesis deals with the synthesis and characterisation of new spin-transition materials based on tetrazole and triazine chemistry. The thesis is thus divided in two main parts. The first part examines the iron(II) coordination chemistry with bistetrazoles, which are well-known ligands in the field of spin-crossover research. The central aim is to generate new members of this interesting family of polymeric spin-transition materials based on these ligands, to better assess the structural/coordination features driving the spin-crossover behaviour. An emphasis is therefore given to the analysis of the crystal structures of the various compounds, newly prepared and reported in the literature (both in the high-spin and low-spin states), to be able to evaluate the influence of the various chemical building units on the overall framework. Additionally, the structural changes caused by the spin transition are thoroughly analysed. In the second part, the use of dpyatriz, a triazine-based ligand, as a unit for the construction of spin-transition materials is reported. In the corresponding chapters, the benefit to use triazine chemistry in the field of spin transition is stressed, setting the grounds for future highly promising systems to be developed.