The preparation and crystal structures of Cu(Hdpa)(chp) 2 and a new phase of Cu(dpa) 2 [Hdpa = 2-(pyridyl-2-amino)-pyridine, Hchp = 6-chloro-2-hydroxypyridine

Abstract

The synthesis and crystal structure of Cu(Hdpa)(chp) 2 ( I) are reported. The copper environment is six coordinate with Hdpa and one of the chp ligands bonding in a chelating fashion. The second pyridine is bound through N, the O atom takes up the sixth coordination site but is also hydrogen bonded to the Hdpa ligand of a second Cu(Hdpa)(chp) 2 unit, forming a centrosymmetric dimer. A new (orthorhombic) phase of Cu(dpa) 2 ( II) has also been found, in which distorted tetrahedral copper(II) complexes are linked through a network of H bonds between the deprotonated dpa ligand and CH bonds meta- to the pyridyl nitrogen donor.