Iron(II) coordination polymers based on 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene: Structures and magnetic properties

Four new diverse structural iron(II) coordination polymers, namely, [Fe(btx)3(H2O)2](ClO4)2·2H2O·btx (1), [Fe(btx)(N(CN)2)2(H2O)2] (2), [Fe(btx)2(SCN)2]·0.5EtOH·CH3CN (3) and [Fe(btx)2(N(CN)2)(H2O)](ClO4)·EtOH·H2O (4) [btx = 1,4-bis(1,2,4-triazol-1-ylmethyl)benzene], are reported with their crystal structures and magnetic properties. Compounds 1 and 2 possess 1D chain bridged by btx ligands, while compounds 3 and 4 have similar 2D (4,4) sheet-like structure. Variable temperature magnetic susceptibility measurements indicate that all of these iron(II) polymers retain a high-spin ground state and the values of χMT at low temperature are attributed to the zero-field splitting of the iron(II) ions and weak antiferromagnetic coupling.