title: A ferrocenyl-substituted 1,2,4-triazole ligand and its Fe(II), Ni(II) and Cu(II) 1D-chain complexes.
abstract: As part of a program aimed at making bifunctional iron(II) spin-crossover (SCO) materials, particularly those having redox/electron transfer as the second function, we have made the new ferrocene-triazole ligand ATF ([(4H-1,2,4-triazol-4-yl)amino]methylferrocene), (1), and a series of M(II) complexes of this ligand with emphasis on iron(II). Polynuclear 1D-chain complexes [Fe(ATF)3](Br)2·0.5(H2O) (2), [Fe(ATF)3](ClO4)2·0.5(H2O) (3), [Ni(ATF)3](ClO4)2·0.5(H2O) (4) and an analogous complex formed with a positively charged ATF ligand [Fe(ATF(+))3](ClO4)5 (6) were formed as polycrystalline powders. Crystals of a mixed ATF/NCS-bridged copper(II) polymer [Cu(ATF)2(NCS)](ClO4)·(Et2O)0.5(MeCN) (5) were formed and structurally characterised. Magnetic and Mössbauer spectral measurements on 2, 3 and 6 indicated that SCO has not been achieved though the Mössbauer data show interesting temperature dependence for doublets of the two iron sites for complexes 2 and 3. Solid state cyclic voltammetric data on the iron(II) complexes 3 and 4 showed well defined, reversible ATF-based electrochemistry, similar to those shown by ATF in solution.
authors.affiliation: School of Chemistry, Monash University, Building 23, Clayton, Victoria 3800, Australia.
authors.forename: Hayley S
authors.initials: HS
authors.lastname: Scott
authors.forename: Ayman
authors.initials: A
authors.lastname: Nafady
authors.forename: John D
authors.initials: JD
authors.lastname: Cashion
authors.forename: Alan M
authors.initials: AM
authors.lastname: Bond
authors.forename: Boujemaa
authors.initials: B
authors.lastname: Moubaraki
authors.forename: Keith S
authors.initials: KS
authors.lastname: Murray
authors.forename: Suzanne M
authors.initials: SM
authors.lastname: Neville