The synthesis of iodine(I) complexes with either benzoimidazole or carbazole-derived sp N-containing Lewis bases is described, as well as their corresponding silver(I) complexes. The addition of elemental iodine to the linear two-coordinate Ag(I) complexes produces iodine(I) complexes with a three-center four-electron (3c-4e) [N-I-N] bond. The H and H- N HMBC NMR studies unambiguously confirm the formation of the complexes in all cases via the [N-Ag-N] →[N-I-N] cation exchange, with the N NMR chemical shift change between 94 to 111 ppm when compared to the free ligand.
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