Lamellar host-guest compounds

Intercalation into lamellar metal oxides and oxide chlorides has also received some attention [353, 354] in particular because of the capacity to intercalate ferrocene. Thus, FeOCl intercalation complexes with ferrocene [355-357] and substituted ferrocenes [358, 359], chromocene [355], cobaltocene [355, 360], ruthenocene [358], and intercalation host-guest complexes of cobaltocene into TiOCl and VOCl [361] have been described and investigated in some detail. Intercalation of some organo-tin compounds into FeOCl has also been reported [362]. 

Kitaura et al. obtained a new lamellar compound [Cu(dhbc)2(4,4 -bpy)] H20 from a diethyl ether solution of copper nitrate, 4,4 -bipyridine, and 2,5-dihydroxybenzoic acid (dhbc).[202] There are strong n-n interactions between the layers of the compound, and because of these interactions the compound behaves as a 3-D framework structure with channels containing guest water molecules that are removable reversibly. After dehydration, the host material exhibits adsorption properties, but its adsorption capacity for nitrogen is affected by the gas pressure. 

Although there are numerous families of lamellar solids, only a handful of them exhibit the kind of versatile intercalation chemistry that forms the basis of this book. In arriving at the content of this volume, the editors have accurately identified six classes of versatile layered compounds that are at the forefront of materials intercalation chemistry, namely, smectite clays, zirconium phosphates and phos-phonates, layered double hydroxides (known informally as hydrotalcites or anionic clays ), layered manganese oxides, layered metal chalcogenides, and lamellar alkali silicates and silicic acids. Graphite and carbon nanotubes have not been included, in part because this specialty area of intercalation chemistry is limited to one or two molecular layers of comparatively small guest species that are capable of undergoing electron transfCT reactions with the host structure. 

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