Formation of Gd coordination polymer with 1D chains mediated by Bronsted acidic ionic liquids

One dimensional coordination polymer Gd[(SO4)(NO3)(C2H6SO)(2)] (1) is prepared through the mediation of Bronsted acid ionic liquid, which crystallized in the monoclinic space of C2/c. In this polymer, adjacent Gd atoms are linked by two SO42- ions to generate a 1-D chain, and all oxygen atoms in SO42- groups are connected to three nearest Gd atoms in mu(3):eta(1):eta(1):eta(2) fashion. Gd, S and N from SO42- and NO3- are precisely coplanar. The planar is coordinated by a pair of DMSO molecules, which is parallel and linked by hydrogen bonding to form a three-dimensional supramolecular network. Magnetic susceptibility measurement of 1 reveals weak antiferromagnetic interactions between the Gd (III) ions. It exhibits relatively large magneto-caloric effect with -Delta S-m=28.8 J Kg(-1) K-1 for Delta H=7 T.