Mono-, di- and trinuclear complexes of bis(terpyridine) ligand: Synthesis, crystal structures and magnetic properties

摘要

Application of Stille-coupling protocol allowed for synthesis of new bis(terpyridine) ligand L (6′,6″-(2-phenylpyrimidine-4,6-diyl)bis(6- methyl-2,2′-bipyridine)) which comprises two tridentate N-donor subunits, designed so as to exploit the formation of supramolecular architectures of different nuclearity. Further complexation, while maintaining reaction parameters unaltered, with the following salts: CoCl_2 (1), Co(NO _3)_2 (2), Cu(NO_3)_2 (3) and Mn(ClO_4)_2 (4) led to three different classes of compounds: mono-, di- and trinuclear species, the result of self-assembly being contingent on the choice of the metal ion as well as to its corresponding counterion. Single crystal structures of [Co(L)Cl_2] (1), [Co_2(L) (NO_3)_4](CH_3CN)_2 (2), [Cu _2(L)(NO_3)_4](CH_3CN)_2 (3) and [Mn_3(L)_2(H_2O)_2(CH _3CN)_4](ClO_4)_6·2H _2O (4) are presented, together with description of their magnetic behavior. Delusively simple coordination compounds were found to self-assemble into interesting supramolecular architectures in the solid state: 1D pillar-like constituent arranged in the helical manner (1), sheets of isostructural 2 and 3, hydrogen bonded zig-zag shaped chains (4). Magnetic susceptibility measurements made the determination of both antiferromagnetic interactions and metal ions′ multiplicity possible.