Structural diversities and magnetic properties of a series of Fe(II) coordination polymers based on bis(triazole) ligands

A series of bis(triazole)-Fe(II) coordination polymers, {[Fe(NCS)(2)(btm)(2)]center dot H2O)(n) (1), {[Fe(bte)(2)(NCS)(2)] [Fe(bte)(H2O)(2)(NCS)(2)]}(n) (2), [Fe(NCS)(2)(btP)(2)](n) (3), {[Fe(NCS)(2)(btb)(2)](a)[Fe(NCS)(2)(btb)(2)](b)}(n) (4) and [Fe(NCS)(2) (bth)(2)](n) (5) (btm = bis-(1,2,4-triazol-1-yl)methane, bte = 1,2-bis-(1,2,4-triazol-1-yl)ethane, btp = 1,3-bis-(1,2,4-triazol-1-yl)propane, btb = 1,4-bis(1,2,4-triazol-1-yl)butane, bth = 1,6-bis(1,2,4-triazol-1-yl)hexane), have been synthesized and structural characterized by X-ray single-crystal diffraction. Compounds 1-3 are 1D chains, complex 4 is a mixture of 2D networks and 1D chains, while complex 5 has 2-fold interpenetrated frameworks of [Fe(NCS)(2)(bth)(2)](n) 2D planes. The iron(II) ions in complexes 1-5 all remain in the high spin state down to 2 K and the experimental data were fitted by using the single ion approximation for Fe(II) ion with zero-field splitting of ground-state quintet. (C) 2015 Elsevier Ltd. All rights reserved.