Bis(acetonitrile-N)(1,4,8,12-tetraazacyclopentadecane)nickel(II) bis(triiodide) and (1,4,8,12-tetraazacyclopentadecane)-palladium(II) bis(triiodide)

In the first title compound, [Ni(C2H3N)2(C11H26N4)][I3]2, the NiII centre is coordinated octahedrally: all four N-donor atoms of the macrocyclic ligand occupy an equatorial plane and the coordination is completed by two axial acetonitrile ligands. Each N-H group forms a contact of 2.97-3.11 Å to one I atom of an I3- anion. One of these anions participates in long I...I contacts of 4.008 (3) Å to form infinite chains of symmetry-related anions. In the second title compound [Pd(C11H26N4)][I3]2, each PdII centre is coordinated in an equatorial plane by four N-donor atoms from the macrocyclic ligand and axially by a terminal iodine from each of two I3- anions at 3.525 (4) Å. The same I atom forms an I...I contact of 4.094 (3) Å such that cations and pairs of anions alternate within one-dimensional zigzag chains.