Synthesis, crystal structure, hydrogen bonding and spectroscopy of transition-metal complexes with the ligand (N,N '-bis(2-pyridylmethyl)-1,3-propanediamine)

摘要

Six mononuclear complexes are reported with the tetradentate ligand N,N'-bis(2-pyridylmethyl)-1,3-propanediamine, (abbreviated as pypn) i.e. [Cu(pypn)(ClO4)(2)](H2O)(1/2) (1), [Fe(pypn)Cl-2](NO3) (2), [Zn(pypn)Cl](ClO4) (3), [Co(pypn)(NCS)(2)](ClO4) (4). [Co(pypn)(N-3)(2)](ClO4) (5), [Zn(pypn)(NCS)(2)] (6). The synthesis and X-ray crystal structures of all six compounds and their spectroscopic properties are presented. The geometry of the Cu2+, Co3+, Zn2+, Fe3+ ions is essentially octahedrally based, with the mm conformation (for Cu) and m(s)f conformations for the other 3 metal ions; in compound 3 the geometry around the Zn2+ is distorted trigonal bipyramidal. The stabilisation of the crystal lattices is maintained by interesting, relative strong hydrogen bonds.