Anion effect on the topological frameworks of a series of manganese coordination polymers based on 1,4-bis(imidazol-1-yl)-benzene: Syntheses, crystal structures and magnetic properties

摘要

In this work, the rod-like ligand 1,4-bis(imidazol-1-yl)-benzene (bib) has been utilized as a building block to perform counterion researches on the structural diversities of coordination polymers. A series of new manganese compounds, {[Mn(bib)(3)(ClO4)(2)](CHCl3)(2)}(n) (1), [Mn(bib)(2)(N-3)(2)](n) (2), [Mn(bib)(2)(HCO2)(2)](n) (3), [Mn(bib)(2)(Ac)(2)](n) (4), {[Mn(bib)(2)(CF3SO3)(2)](CH2Cl2)(4))(n) (5), and [Mn(bib)(2)(SO4)](n) (6) have been successfully synthesized. Compound 1 shows a 3D interpenetrating alpha-Po network only based on the bib linker. Compounds 2 and 3 exhibit a 2D (4,4) layer with parallel and incline interpenetration, respectively. Compounds 4 and 5 display a parallel-packing 2D (4,4) layer with the porosity of 23.4% and 61.4%, respectively. Compound 6 furnishes a 3D alpha-Po framework with a 2D (4,4) layer pillared by the mu(2)-SO42- ion. The structural diversities among 1-6 have been carefully discussed, and the roles of counterions (from coordination affinity and molecular size) in the self-assembly of coordination polymers have also been well documented. Furthermore, magnetic properties of 6 have been carefully studied. (C) 2014 Elsevier Inc. All rights reserved.