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In the asymmetric unit of the title polymeric complex, {[CuI(C11H9N3)]·0.5CH3CN}n, there are two CuI atoms, two N-[(pyridin-2-yl-κN)methylidene]pyridin-3-amine (PyPy) ligands and two I atoms. Both CuI atoms have a distorted tetrahedral geometry, each being coordinated by one I atom, two N atoms of one PyPy ligand and one N atom from an adjacent PyPy ligand. In the crystal, infinite helical chains of [Cu2(PyPy)2]n are formed propagating along the b axis. These chains are linked via weak C—H
I hydrogen bonds and π–π stacking interactions [shortest centroid–centroid distance = 3.2727 (14) Å]. During the refinement, electron-density peaks were located that were believed to be highly disordered solvent molecules (possibly acetonitrile). The SQUEEZE option in PLATON [Spek (2009). Acta Cryst. D65, 148–155] indicated there were solvent cavities with a total volume of 196 Å3 containing approximately 60 electrons per unit cell, which equated to one molecule of acetonitrile per asymmetric unit.
I hydrogen bonds and π–π stacking interactions [shortest centroid–centroid distance = 3.2727 (14) Å]. During the refinement, electron-density peaks were located that were believed to be highly disordered solvent molecules (possibly acetonitrile). The SQUEEZE option in PLATON [Spek (2009). Acta Cryst. D65, 148–155] indicated there were solvent cavities with a total volume of 196 Å3 containing approximately 60 electrons per unit cell, which equated to one molecule of acetonitrile per asymmetric unit.
