Synthesis and Characterization of Two Pb(II) Complexes of 2,2′-dihydroxy, Dimethoxy-1,1′-binaphthyl-3,3′-dicarboxylic Acid

Abstract

Two new complexes {[Pb(L¹)(DMSO)₂(H₂O)]·DMF}_n (1, L¹ = 2,2′-dihydroxy-l,l′-dinaphthyl-3,3′-dicarboxylate) and {[Pb(L²)(DMS O)·DMSO}_n (2, L² = 2,2′-dimethoxy-l,l′-dinaphthyl-3,3′-dicarboxylate) have been synthesized under mild conditions and structurally characterized. Crystal structural analysis reveals that complex 1 adopts a 1D infinite chain structure which forms 2D sheet by hydrogen bonds interactions. Complex 2 possesses a 2D sheet structure, which was further assembled into a 3D supramolecular network through the π-π weak interactions. IR spectra indicates the carboxyl group coordinates with the Pb²⁺ ion. TGA shows that complex 2 is highly thermally stable up to 120°C.

Keywords:

• Binaphthol-based ligands
• crystal structure
• metal-organic frameworks

Acknowledgments

The work was financially supported by the Natural Science Foundation of Hebei Province (No. B2012201109, No. B2010000223), and Science & Technology Pillar Program of Hebei Province (No. 12211212). Crystallographic data for the structural analysis have been deposited with the Cambridge Crystallographic Data Centre, CCDC No. 949351 and 949350. Copies of this information can be obtained free of charge from The Director, CCDC, 12 Union road, Cambridge, CB21EZ, UK (fax: [phone]; E-mail: [email protected]; www:http://www.ccdc.cam. ac.uk).