Bis(nitrato-κ)(1,4,8,11-tetra-aza-cyclo-tetra-decane-κ)zinc(II) methanol monosolvate.

Abstract

This study reports the crystal structure of a zinc(II) complex coordinated by 1,4,8,11-tetraazacyclotetradecane (cyclam) with two nitrate ligands as a methanol monosolvate. Each zinc center adopts a distorted octahedral geometry, with cyclam nitrogen atoms occupying the equatorial plane and nitrate oxygen atoms at the axial positions. The cyclam ring adopts a type-III conformation (δδλλ), consistent with patterns observed in other metal-cyclam complexes. Nitrate anions participate in both intramolecular and intermolecular hydrogen bonding with the N-H groups of the Zn-cyclam unit. Combined with the methanol solvent molecule, this hydrogen-bonding network organizes the Zn-cyclam units into ribbon-like arrangements extending parallel to the crystallographic a-axis.