(4,7,13,16,21,24-Hexaoxa-1,10-di­aza­bicyclo­[8.8.8]hexa­cosa­ne)sodium iodide–1,1,2,2,tetra­fluoro-1,2-diiodo­ethane (2/3)

The title complex (CX1), [Na(C₁₈H₃₆N₂O₆)]I·1.5C₂F₄I₂, is a three-component adduct containing a [2.2.2]-cryptand, sodium iodide and 1,1,2,2-tetra­fluoro-1,2-di­iodo­ethane. The di­iodo­ethane works as a bidentate halogen-bonding (XB) donor, the [2.2.2]-cryptand chelates the sodium cation, and the iodide counter-ion acts as a tridentate XB acceptor. A (6,3) network is formed in which iodide anions are the nodes and halocarbons the sides. The network symmetry is C_3i and the I...I⁻ XB distance is 3.4492 (5) Å. This network is strongly deformed and wrinkled. It forms a layer 9.6686 (18) Å high and the inter-layer distance is 4.4889 (10) Å. The cations, inter­acting with each other via weak O...H hydrogen bonds, are confined between two anionic layers and also form a (6,3) net. The structure of CX1 is closely related to that of the KI homologue (CX2). The 1,1,2,2,-tetrafluoro-1,2-diiodoethane molecule is rotationally disordered around the I...I axis, resulting in an 1:1 disorder of the C₂F₄ moiety.

1,3-Bis(2,3,5,6-tetra­fluoro-4-iodo­phen­oxy)-2,2-bis­[(2,3,5,6-tetra­fluoro-4-iodo­phen­oxy)meth­yl]propane

In the crystal structure of the title compound, C₂₉H₈F₁₆I₄O₄, short I...I and I...F contacts, which can be understood as halogen bonds (XBs), represent the strongest inter­molecular inter­actions, consistent with the presence of I and F atoms, and the absence of H atoms, at the periphery of the mol­ecule. In addition, π–π stacking inter­actions between tetra­fluoro­iodo­phenyl (TFIP) groups and five short F...F inter­actions are present.