title: Polynuclear spin crossover complexes: synthesis, structure, and magnetic behavior of [Fe4(mu-CN)4(phen)4(L)2)]4+ squares.
abstract: Three new tetranuclear compounds of formula [Fe(4)(mu-CN)(4)(phen)(4)(L)(2))](PF(6))(4) x G where L = tris(pyridin-2-ylmethyl)amine (TPMA) [G = 0] (1), (6-methylpyrid-2-ylmethyl)-bis(pyrid-2-ylmethyl)amine (MeTPMA) [G = 0] (2), or bis(6-methylpyrid-2-ylmethyl)-(pyrid-2-ylmethyl)amine (Me(2)TPMA) [G = NH(4)PF(6)] (3) and phen = 1,10-phenanthroline) have been synthesized and characterized. The three compounds crystallize in the C2/c space group and consist of [Fe(4)(mu-CN)(4)(phen)(4)(L)(2))](4+) square shaped cations with two distinct iron(II) sites. The sites, associated with [Fe(phen)(2)(CN)(2)] and [Fe(L)(NC)(2)] moieties, are connected by cyanide bridging ligands and reside in different [FeN(4)C(2)] and [FeN(6)] ligand field strength environments. For 1, the structural features of both sites at 100 and 293 K are those of an iron(II) atom in the low-spin state, according to the magnetic properties. At 370 K the structure of the [FeN(6)] site is consistent with a quite complete change of spin state from the low-spin state to the high-spin state, a behavior confirmed by the magnetic study. Introduction of a methyl substituent in the sixth position of one or two pyridine groups to get MeTPMA or Me(2)TPMA derivatives, respectively, induce in 2 and 3 notable steric constraint in the [FeN(6)] site making longer the average Fe-N bond distances thereby weakening the ligand field strength and stabilizing the high-spin state. The [FeN(4)C(2)] site remains in the low-spin state in the three compounds.
authors.affiliation: Institut de Ciència Molecular/Departament de Química Inorgànica, Universitat de València, Edifici de Instituts de Paterna, P.O. Box 22085, 46071, València, Spain.
authors.forename: Ishtvan
authors.initials: I
authors.lastname: Boldog
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Muñoz-Lara
authors.forename: Ana B
authors.initials: AB
authors.lastname: Gaspar
authors.forename: M Carmen
authors.initials: MC
authors.lastname: Muñoz
authors.forename: Maksym
authors.initials: M
authors.lastname: Seredyuk
authors.forename: José A
authors.initials: JA
authors.lastname: Real
mesh_terms: D018360:Crystallography, X-Ray; D005296:Ferrous Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D008024:Ligands; D008280:Magnetics; D008958:Models, Molecular; D013696:Temperature
chemical_list: D005296:Ferrous Compounds; D008024:Ligands