Synthesis, X-Ray Structure, and Characterization of Catena-bis(benzoate)‎bis{N,N-bis(2-hydroxyethyl)‎glycinate}cadmium(II)‎

Abstract EN

The reaction of N,N-bis(2-hydroxyethyl)glycine (bicine; bicH3) with Cd(O2CPh)2·2H2O in MeOH yielded the polymeric compound [Cd2(O2CPh)2(bicH2)2]n(1).

The complex crystallizes in the tetragonal space group P41212.

The lattice constants are a=b=12.737(5) and c=18.288(7) Å.

The compound contains chains of repeating {Cd2(O2CPh)2(bicH2)2} units.

One CdII atom is coordinated by two carboxylate oxygen, four hydroxyl oxygen, and two nitrogen atoms from two symmetry-related 2.21111 (Harris notation) bicH2− ligands.

The other CdII atom is coordinated by six carboxylate oxygen atoms, four from two bicH2- ligands and two from the monodentate benzoate groups.

Each bicinate(-1) ligand chelates the 8-coordinate, square antiprismatic CdII atom through one carboxylate oxygen, the nitrogen, and both hydroxyl oxygen atoms and bridges the second, six-coordinate trigonal prismatic CdII center through its carboxylate oxygen atoms.

Compound 1 is the first structurally characterized cadmium(II) complex containing any anionic form of bicine as ligand.

IR data of 1 are discussed in terms of the coordination modes of the ligands and the known structure.