Notes. Characterization of a zinc(II) complex of a 15-membered macrocyclic ligand in the solid state and in solution : X-ray structure of (6,7,8,1 3,14,15,16,17,18,19-decahydro-5H-[e,n][1,4,8,12]tetra-azacyclopentadecine)iodozinc(II) iodide
Abstract
Reaction of the title 15-membered macrocyclic ligand (L1) with ZnI2 leads to the isolation of [Zn(L1)I][I]. The X-ray structure determination of this complex confirms a square-pyramidal co-ordination geometry for the ZnII, in which the metal is bound by the four nitrogens of the macrocycle and has one axial iodine ligand. N.m.r. spectroscopic measurements confirm the 1 : 1 zinc to ligand stoicheiometry in solution and indicate that the complex undergoes slow chemical exchange at ambient temperature. The complex crystallises in monoclinic space group P21/c with a= 8.279(3), b= 18.211(6), c= 14.723(4)Å, and β= 99.21(4)°. The structure was refined to R= 0.033 for 2 597 reflections.