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Spin Crossover in Polymeric Materials Using Schiff Base Functionalized Triazole Ligands
Author(s) -
Scott Hayley S.,
Ross Tamsyn M.,
Moubaraki Boujemaa,
Murray Keith S.,
Neville Suzanne M.
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201201071
Subject(s) - spin crossover , chemistry , schiff base , ligand (biochemistry) , 1,2,4 triazole , crystallography , triazole , antiferromagnetism , stereochemistry , medicinal chemistry , organic chemistry , biochemistry , physics , receptor , condensed matter physics
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 · 2H 2 O (A = BF 4 , ClO 4 , Br, NO 3 ; 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 · 2H 2 O [A = BF 4 ( 1 ), ClO 4 ( 2 ), Br ( 3 )] and [Fe(Hcintrz) 3 ](A) 2 · 1.5(H 2 O) [A = BF 4 ( 4 ), ClO 4 ( 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 {[Fe 2 (Hsaltrz) 5 (NCS) 4 ] · 2MeOH ( 7 )} and a trinuclear {[Fe 3 (Hsaltrz) 6 (H 2 O) 2 (EtOH) 4 ](ClO 4 ) 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.

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