Assembling Isomeric heterocyclic disulfide ligands with copper(I) iodide: effect of ligand structure on their assembly structures and S–S reactivity

Abstract

Self-assembly of two isomeric heterocyclic disulfide ligands, n-ppds (n-ppds = di[n-(pyridin-2-yl)pyrimidinyl]disulfide, n = 3, 4), with copper(I) iodide in acetonitrile/toluene produced different assembled structures and S–S reactivity, exhibiting profound influence of disulfide structure. For 3-ppds, a 2D layered structure 1 based on [CuI(3-ppds)]₂ was obtained. Homolytic cleavage of the S–S bond occurred in 4-ppds, resulting in a 1D staircase double-chain structure 2. 1 and 2 have been characterized by single-crystal X-ray diffraction; solid-state diffuse-reflectance UV–vis spectra show that 1 and 2 are semiconductors with band gaps of 2.88 and 2.16 eV, respectively.

Keywords:

• Heterocyclic disulfide
• S–S bond cleavage
• Copper iodide
• Crystal structure
• Band gap

Acknowledgments

We acknowledge the financial support provided by the National Natural Science Foundation of China (Nos. 20801011 and 21171036) and Teaching and Research Program for the Excellent Young Teachers of Southeast University (No. 3207041202).