Further study of the effect of macrocyclic pendant groups on the supramolecular architecture: Synthesis and structures of macrocyclic nickel (II) complexes with trans-butene dicarboxylate

Two nickel (II) complexes with the formula [NiL(H2O)2] · 6H2O (1 · 6H2O) and [NiH2L(BDC)]n (2), where L = 3,10-bis(3-propylcarboxyl)-1,3,5,8,10,12-hexaazacyclo-tetradecane, BDC = trans-butene dicarboxylate, have been synthesized and characterized by elemental analyses, IR spectra and single-crystal X-ray analyses. In 1, the Ni(II) ion is six-coordinated with four nitrogen atoms from the macrocyclic ligand in the equatorial plane and two water molecules in axial position. In 2, the structure is made up of one-dimensional chain of [NiH2L]2+ units with BDC2− anions, in which the Ni(II) ion is also six-coordinated with four nitrogen atoms from the macrocyclic ligand in the equatorial plane and two carboxylate oxygen atoms from the BDC2− group in axial position. In 2, the 1D chains are aligned in a parallel mode.