Intercalated iodine molecules

Much larger iodine catenates are obtained when metal iodides are present the reaction of Til with (MesS) resulted in a number of species from which (Mc3 8)3126 has been structurally characterized, and shown to be of [15] and [17] anions with intercalated iodine molecules. A mixture is identified in [Me3PNHPMe3]4(l28), the linear [13] , the Z-shaped [Ig] , and the zigzag chains of In [Cp2Fe]3[l29], the most iodine-rich polyiodide, the ferrocenium cations, are made to interact in the cavities of an anionic three-dimensional network cage structure described by the formula [ (l5 )i/2 l2 (li2 )i/2T2 -l2]. ... 

Cgg forms mixed crystals or cocrystals with other molecules. Thus, crystals of Cgg with benzene, ferrocene, pentane, etc. have been prepared and their crystal structures determined. C g also readily intercalates iodine. While none of these solids shows any degree of charge transfer from or to C g, the structures of these crystals... 

It is probable that similar complexes are formed when iodine and the iodine halides are intercalated into graphite. In this case, two subspectra are seen (Table 6), suggesting that the I2 molecule is bound through only one atom. The parameters are very similar to those for the cr-complexes discussed below (Table 7). It seems likely that the structure of the Qo—12 complex is similar, although other possibilities have also been considered28. 

An apparent additional tellurium-rich subiodide (237) was identified to be a novel type of intercalation compound with an idealized composition of (Te2)2(l2) and with a minimum experimental iodine content of (Te2)2(l2)o.42 (227). It consists of planar tellurium double layers with 1+4-coordination of the Te atoms, between which planar monomolelu-lar layers of weakly associated I2 molecules are intercalated. 

A new approach to combating iodine deficiency through controlled release of iodide by a silicone elastomer has been reported (Fisch et ai, 1993). Silicone elastomers or silicone rubbers made from cross linked polymers are reinforced with silica. Silicones, being chemically inert, are safe and stable over a wide range of temperatures and have a high permeability to small molecules. Sodium iodide, being a small molecule, can be intercalated into the silicone matrix from where iodine is released in a controlled manner when water is passed through it. 

In the case of electron acceptors, iodine was first tried and found to form I2C60 and/or I4C60 [76,77]. Although bromine was testeed for intercalation, it makes double bonds between C o molecules to form a... 

---