Synthesis and characterization of three ionic pairs of Fe(II) and Co(II) complexes with tridentate salicylideneglycine

Abstract

Three new transition metal complexes, [Fe^II(H₂O)₆][(C₉H₇NO₃)₂Fe^II] · H₂O (1), H[K(H₂O)₃][(C₉H₇NO₃)₂Co^II] · H₂O (2), and [Co^II(H₂O)₆][(C₉H₇NO₃)₂Co^II] · H₂O (3), with salicylideneglycine have been synthesized and characterized by elemental analysis, IR spectra, UV-Vis spectroscopy, and X-ray crystallography. The structure analyses indicate that the tridentate salicylideneglycine binds through aliphatic nitrogen, phenoxy, and carboxylic oxygen in the anion. There are many inter- and intra-molecular hydrogen bonds among lattice water, the anion, and the cation to form a 3-D network. The thermogravimetric analyses and the quantum chemistry calculations of compounds 1, 2, and 3 are also discussed.

Keywords:

• Complexes
• Salicylideneglycine ligand
• Crystal structure
• Hydrogen bonds

Acknowledgments

We express our sincere thanks to the National Natural Science Foundation of China (No. 20771051, 20633050) and Education Foundation of Liaoning Province (No. Grant 2007T093), for financial assistance.