An iron(ii) coordination polymer of a triazolyl tris-heterocycle showing a spin state conversion triggered by loss of lattice solvent

Abstract

Solvated crystals of “[FeL2][BF4]2·H2O” (L = 2-(1,2,4-triazol-1-yl)-6-(pyrazol-1-yl)pyridine) contain a 1D coordination polymer [Fe(μ-L)2{Fe(OH2)2L2}][BF4]4, with κ1:κ3,μ-L coordination.

Redox and guest tunable spin-crossover properties in a polymeric polyoxometalate

“…10,11 However, the resultant materials were oen poorly crystalline, with incomplete and very gradual SCO transitions. 12 In this work, an alternative strategy has been attempted: instead of using a neutral and electrically innocent organic spacer between the two 1-bpp units of the ditopic ligand, a charged ligand containing a polyoxometalate (POM) moiety has been prepared. POMs are polyanionic molecular-metal oxides of groups 5 or 6 transition metals in their highest oxidation states.…”

“…10,11 However, the resultant materials were often poorly crystalline, with incomplete and very gradual SCO transitions. 12…”