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.
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