A mercury(II)-radical complex with a 1D ladder structure

Abstract

Interaction of HgI₂ with a new long rigid nitronyl nitroxide radical ligand, 2-[4-(2-pyridin-4-yl-vinyl)phenyl]-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (L), leads to the formation of the mercury-radical complex [Hg₂I₄L₂] _n (1). The single crystal structure analysis reveals that 1 exhibits a one-dimensional (1D) ladder structure. Magnetic susceptibility data of 1 were simulated by a uniform chain model composed of the NIT–NIT dimers, indicating that there exist an antiferromagnetic exchange between the nitroxides within the dimer (J ₁ = −8.41 cm⁻¹) and a very weak interdimer antiferromagnetic interaction (J _c = −0.39 cm⁻¹).

Keywords:

• Nitronyl nitroxide complex
• Mercury complex
• Ladder structure
• Magnetic properties

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 20473096 and 20671093), Major State Basic Research Development Program of P. R. China (2001CB610507), Center for Molecular Science (CMS-CX200405), Institute of Chemistry and Chinese Academy of Sciences.