A New Di-Copper(II) Complex of Schiff-Base and 1,3-Di(pyridin-4-yl)propane Ligands: Synthesis, Spectral, Thermal Properties, and Crystal Structure

Abstract

A new binuclear copper(II) complex with the Schiff-base ligand N-(2-hydroxybenzyl)aminomethanesulfonic acid (H₂Saes) has been synthesized, [Cu(Saes) (1,3-dpp)]₂ (1,3-di(pyridin-4-yl)propane abbreviation as 1,3-dpp) (1), and characterized by single-crystal X-ray diffraction, elemental, IR spectra, and thermogravimetric analyses. Complex 1 shows phenoxo-bridged dinuclear Cu₂O₂ core with intermetallic distance of 3.19 (8) Å. In the crystal structure, 1D infinite chain structure is formed through weak π-π stacking interactions between the phenyl rings of adjacent dimmer units with ring-centroid distances of 3.787 (4) Å. In addition, 2-D layers structure are formed by intermolecular C-H···O hydrogen bonds with the separate C···O distances of 3.278 (8)-3.533 (9) Å. Molecules from neighboring stacks further interdigitate with each other in the c-direction, leading to an interwoven three-dimensional network held together by C-H···O interactions and π-stacking and stabilize the coordination complex.

Keywords:

• copper(II) complex
• crystal structure
• Schiff-base
• synthesis
• thermal properties

Acknowledgments

This work was supported by the Natural Science Foundation of Guangxi Province (Grant nos. 2010GX NSFD013017 and 2011GXNSFB018023). The authors also acknowledge the financial support from the State Key Laboratory of Cultivation Base for the Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China (CMEMR2011-13) and the Scientific research and technological development project of GuiLin (No. 20110330).