Syntheses, structures, and properties of supramolecular complexes with bipyridine and amino-Schiff-base derived from salicylaldehyde with glycine

The reactions of stoichiometric amounts of Cu(CH3COO)2 center dot 2H2O or Ni(CH3COO)2 center dot 2H2O with KHL (potassium salt of salicylideneglycine) and 4,4'-bipy or 2,2'-bipy ethanol afforded [Cu2(L)2(-4,4'-bipy)(4,4'-bipy)2] center dot 2H2O (1) (L = salicylideneglycine) and Ni(OAc)2(2,2'-bipy) (H2O)2 (2), respectively. The structure of 1 contains two Cu(II)'s, bridged by 4,4'-bipy; each copper is square pyramidal. Complex 2 contains a Ni(II) in highly distorted octahedral geometry. The two complexes were constructed into 3-D interwoven networks by typical H-bonding (i.e., O-H center dot center dot center dot O and N-H center dot center dot center dot O) and some other intra- or intermolecular weak interactions (i.e., C-H center dot center dot center dot O).