Solvent-controlled synthesis and crystal structures of a pair of azido-bridged copper(II) complexes constructed from 1-[(3-dimethylaminopropylimino)methyl]naphthalen-2-ol

Abstract

A pair of azido-bridged copper(II) complexes, [Cu₂L₂(μ _1,1-N₃)₂] (1) and [Cu₂L₂(μ _1,3-N₃)₂] · H₂O (2) (HL = 1-[(3-dimethylaminopropylimino)methyl]naphthalen-2-ol), have been obtained from an identical synthetic procedure and starting materials with solvents as the only independent variable. Complex 1 was synthesized and crystallized using the anhydrous methanol, while 2 was synthesized and crystallized using 95% ethanol. Both complexes show interesting self-assembled structures in their crystals as elucidated by X-ray analysis. The end-on azido-bridged dinuclear 1 crystallizes in the P 1 space group. The end-to-end azido–bridged polymeric 2 crystallizes in the P2₁/c space group.

Keywords:

• Synthesis, Schiff base
• Copper(II) complex
• Crystal structure
• Azide

Acknowledgements

This work was financially supported by the Office of Dalian Science & Technology (Project No. 2007J23JH018) and by the Scientific Research Foundation of the Education Office of Liaoning Province (Project No. 20060495).