title: A mixed-ligand approach for spin-crossover modulation in a linear Fe(II) coordination polymer.
abstract: In this work, we present a family of Fe(II) coordination polymers of general formula [Fe(btzx)(3-3x)(btix)(3x)](ClO4)2 with interesting spin-crossover properties. These coordination polymers have been synthesized using chemical mixtures of two different but closely related ligands, 1,4-bis(tetrazol-1-ylmethyl)benzene (btzx) and 1,4-bis(triazol-1-ylmethyl)benzene (btix), and the effect of a gradual substitution of the ligand in the spin transition temperature has been investigated. Several chemical mixtures have been structurally characterized by X-ray powder diffraction indicating a clear critical amount in the composition of the mixture after which mixed phases rather than a single phase comprising mixed components are observed. Importantly, this approach causes the appearance of a new transition at lower temperatures that is not present in the pure [Fe(L)3](ClO4)2 systems.
authors.affiliation: Instituto de Ciencia Molecular (ICMol), Universitat de València , c/Catedrático José Beltrán, 2, 46980 Paterna, Spain.
authors.forename: Néstor
authors.initials: N
authors.lastname: Calvo Galve
authors.forename: Eugenio
authors.initials: E
authors.lastname: Coronado
authors.forename: Mónica
authors.initials: M
authors.lastname: Giménez-Marqués
authors.forename: Guillermo
authors.initials: G
authors.lastname: Mínguez Espallargas
mesh_terms: D005296:Ferrous Compounds / Q000737:chemistry*; D008024:Ligands; D011108:Polymers / Q000737:chemistry*; D033362:Powder Diffraction; D013818:Thermogravimetry
chemical_list: D005296:Ferrous Compounds; D008024:Ligands; D011108:Polymers