Synthesis, X-ray structure, and characterization of catena -bis(benzoate)bis {N, N -bis(2-hydroxyethyl)glycinate}cadmium(II)

Abstract

The reaction of N,N -bis(2-hydroxyethyl)glycine (bicine; bicH 3) with Cd (O 2 CPh) 2 2 H 2 O in MeOH yielded the polymeric compound [ Cd 2 (O 2 CPh) 2 (bicH 2) 2 ] n (1).Å The complex crystallizes in the tetragonal space group P 41 2 1 2. The lattice constants are a= b = 12.737(5) and c = 18.288(7) .Å The compound contains chains of repeating { Cd 2 (O 2 CPh) 2 (bicH 2) 2 } units. One Cd II 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 Cd II 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 Cd II atom through one carboxylate oxygen, the nitrogen, and both hydroxyl oxygen atoms and bridges the second, six-coordinate trigonal prismatic Cd II 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. Copyright © 2010 Eugenia Katsoulakou et al.