When an electron is removed from a halogen atom, it forms a halenium ion X⁺ (X = I, Br, Cl). In halogen bonding (XB), X⁺ is considered as a strong XB donor, and when interacting with two XB acceptors (e.g., pyridine), it forms a halonium XB complex with a [N–I–N] three-center-four-electron bond with the two XB acceptors. An unprecedented I⁺···Ag⁺ interaction occurs between a [L₁–I–L₁]⁺ halogen-bonded complex and a [L₂–Ag–L₂]⁺ complex in which the iodonium ion acts like a nucleophile and donates electrons to the silver(I) cation. The X-ray diffraction analysis reveals a short contact [3.4608(3) Å] between the I⁺ and Ag⁺ cations, and ITC measurements give a ΔG of −6.321 kcal/mol and K_a∼37,000 M⁻¹ for the 1:1 complex. The DFT computational study on the nature of the I⁺···Ag⁺ interaction indicates that the I⁺ is nucleophilic in character, manifesting an unusual and strongly attractive interaction between the I⁺ and Ag⁺ cations.

当电子从卤原子上除去时，它形成a离子X ⁺（X = I，Br，Cl）。在卤素键（XB）中，X ⁺被认为是强大的XB供体，当与两个XB受体（例如吡啶）相互作用时，它会形成具有[N–I–N]三中心四的ha XB配合物。与两个XB受体的电子键。[L ₁ –I–L ₁ ] ⁺卤素键复合物与[L ₂ –Ag–L ₂ ] ⁺之间发生前所未有的I ⁺ ··Ag ⁺相互作用碘鎓离子的作用类似于亲核试剂，并向银（I）阳离子提供电子。X射线衍射分析显示I ⁺和Ag ⁺阳离子之间有短接触[3.4608（3）Å] ，ITC测量得出1：的ΔG为-6.321 kcal / mol，K _a约为37,000 M ^-1。 1个复合体。DFT对I ⁺ ···Ag ⁺相互作用性质的计算研究表明，I ⁺具有亲核性质，表现出I ⁺与Ag ⁺阳离子之间异常且强烈的相互作用。