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- Title
Spin Crossover in Polymeric Materials Using Schiff Base Functionalized Triazole Ligands.
- Authors
Scott, Hayley S.; Ross, Tamsyn M.; Moubaraki, Boujemaa; Murray, Keith S.; Neville, Suzanne M.
- Abstract
Functionalized 1,2,4-( R)-triazole-based Schiff base (R-N=CH-R′) ligands have been incorporated into spin crossover 1D materials of the general formula [Fe(Xtrz)3](A)2 ·2H2O (A = BF4, ClO4, Br, NO3; Xtrz = triazole liands). The ligand N-salicylidene 4-amino-1,2,4-triazole (Hsaltrz) and the novel ligand N-cinimalidene 4-amino-1,2,4-triazole (Hcintrz) were targeted to assess the implication of incorporating various aromatic functional groups on the spin crossover properties of this well-known family of one-dimensional materials. Magnetic susceptibility measurements on the polycrystalline powdered materials [Fe(Hsaltrz)3](A)2 ·2H2O [A = BF4 ( 1), ClO4 ( 2), Br ( 3)] and [Fe(Hcintrz)3](A)2 ·1.5(H2O) [A = BF4 ( 4), ClO4 ( 5), Br ( 6)] revealed spin transitions over the range T ${1 \over 2}$ = 100-225 K. The spin crossover properties of the dehydrated materials were also investigated [ 1- 6(dh)]. In attempts to prepare single crystals of these materials a dinuclear {[Fe2(Hsaltrz)5(NCS)4] ·2MeOH ( 7)} and a trinuclear {[Fe3(Hsaltrz)6(H2O)2(EtOH)4](ClO4)6 ·2(EtOH) ( 8)} complex were obtained; these materials remain high spin over all temperatures and display weak antiferromagnetic exchange coupling. The structure of the novel ligand Hcintrz ( 9) is reported.
- Subjects
SPIN crossover; POLYMERS; SCHIFF bases; TRIAZOLES; LIGANDS (Chemistry)
- Publication
European Journal of Inorganic Chemistry, 2013, Vol 2013, Issue 5/6, p803
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201201071