Recombination of Coordination Bonds of a Mononuclear Precursor into a 3D d-d′ Heterometallic Coordination Polymer with Double Helices.

Abstract. Based on a mononuclear precursor [Mn(Hstp)2(4,4′-Hbpy)2] ( 1), a hetero-metallic complex, [Mn2Ni(stp)2(4,4′-bpy)(H2O)4] ( 2) [stp = 2-sulfoterephthalate, 4,4′-bpy = 4,4′-bpyridine] was synthesized by solvothermal reaction. Single-crystal X-ray diffraction analysis reveals that the MnII ion of the precursor 1 is hexacoordinate by four oxygen atoms from two Hstp2- anions and two nitrogen atoms from two protonated 4, 4′-Hbpy, and hydrogen bonding plays a significant role in constructing 3D supramolecular structure. While complex 2 features a self-weaving framework from 1D straight chains and 2D wavy networks with double helical chains. Magnetic behavior of complex 2 was analyzed in connection with its crystal structure, which exhibits the weak antiferromagnetic interactions between the MnII and NiII ions. [ABSTRACT FROM AUTHOR]