Synthesis, structural, and magnetic properties of a supramolecular assembly constructed from radical cations and [Au(CN)₂]⁻ anions

Abstract

A supramolecular assembly of [p-MePyNN]₂[Au(CN)₂]₂ (1) (p-MePyNN⁺ = 2-(4-N-methylpyridinium)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazo-1-oxyl-3-oxide radical cation) has been synthesized from the combination of p-N-methylpyridinium nitronyl nitroxide radical cations and [Au(CN)₂]⁻ anions, and characterized structurally as well as magnetically. The compound crystallizes in the orthorhombic, space group P2₁2₁2₁ , with two independent p-MePyNN⁺ cations separated from each other by the dimer . The magnetic study shows that the larger steric hindrance of [Au(CN)₂]⁻ anion influences the magnetic interactions between the radical cations, with very weak antiferromagnetic interactions.

Keywords:

• Supramolecular complex
• Nitronyl nitroxide radical
• Crystal structure
• Magnetism

Acknowledgments

This project was supported by the National Natural Science Foundation of China No. 20631030, National Basic Research Program of China, 973 Program, 2007CB815305, and Natural Science Foundation of Tianjin 09JCYBJC05500.