The enhanced coordination capability and rigid structure of PDA2− are not only helpful to construct high-nuclearity metal cluster but also confer high thermodynamic stabilityon the corresponding complexes. 1,10-Phenanthroline-2,9-dicarboxylic acid (H2PDA) has versatile chelating and bridging capabilities, which play an important role in coordination chemistry. Preorganized ligands can be good candidates for biomedical applications and sensors because of their intrinsic rigidity and selective behavior. These ligands show a promising future in the bioinorganic, nuclear and industrial fields as well as many other fields. Therefore, we synthesized Co(II) complexes with this ligand and auxiliary ligands such as 2,2'-bipyridine (bipy) and 1,10-Phenanthroline (Phen) using various methods. The chemical formulas of [Co(PDA)(Phen)(H2O)]·H2O∙CH3CN(1), [Co(PDA)(bipy)]·H2O(2) were determined by the help of elemental analysis and infrared spectroscopy (Fig. 1.). References [1] N.E. Dean, Metal ion complexing properties of the highly preorganized ligand 1,10–Phenanthrolin– 2,9–dicarboxylic acid, North Carolina Wilmington, 2007. [2] Q. Chen, M.H. Zeng, L.Q. Wei, M. Kurmoo, Chem. Mater., 2010, 22, 4328. [3] Y.L. Miao, J.L. Liu, Zh.J. Lin, Y.C. Ou, J.D. Leng, M.L. Tong, Dalton Trans., 2010, 39, 4893.

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