Silver(I) Complexes of 2,2′;6′,4″-Terpyridine: The Formation of Discrete Dimers versus Helical Polymers is Anion Dependent

Carbonyl hypoiodites from pivalic and trimesic acid and their silver(I) intermediates

The first tris(O-I-N) carbonyl hypoiodites have been synthesised based on trimesic acid and pyridine or 4-methylpyridine, with their structures definitively confirmed by single crystal X-ray diffraction (SCXRD). The more soluble carbonyl hypoiodites based on pivalic acid have also been studied via NMR, SCXRD, and computational analyses, enabling the study of the direct silver(I) precursor and intermediates of the resulting carbonyl hypoiodites generated using a range of substituted pyridines.

Utility of Three-Coordinate Silver Complexes Toward the Formation of Iodonium Ions

The work herein describes the synthesis of five three-coordinate silver(I) complexes comprising a bidentate ligand L1, either bpy (2,2'-bipyridyl) or bpyMe₂ (4,4'-dimethyl-2,2'-dipyridyl), and a monodentate ligand L2, either mtz (1-methyl-1H-1,2,3-triazole), 4-Etpy (4-ethylpyridine), or 4-DMAP (N,N-dimethylpyridin-4-amine). Upon reaction of the three-coordinate silver(I) complexes with 0.5 equiv of I₂, the reactions quantitatively produce a 1:1 pair of complexes of a four-coordinate silver(I) complex [Ag(L1)₂]PF₆ and a two-coordinate iodonium complex [I(L2)₂]PF₆. The combination of [Ag(bpyMe₂)₂]PF₆ and [I(4-DMAP)₂]PF₆ gave rise to an I⁺···Ag⁺ interaction where the I⁺ acts as a nucleophile, only the second example of which, that was observed in both the solution (NMR) and solid (X-ray) states.

Anion templated double cyclization assembly of a chloride selective [2]catenane

The interweaving of two identical acyclic positively charged anion recognizing units around a chloride anion template leads to the formation of an orthogonal supramolecular ensemble which upon subsequent double ring cyclization gives a chloride selective [2]catenane in very high yield.