Adsorption of large and complex molecules

Examples of building up large molecules inside a zeolite structure via a reaction were frequently reported under the term ship-in-the-bottle synthesis . For instance, very early Romanowski et al. [844] and, somewhat later, Schulz-Ekloff et al. [845] produced phthalocyanines in faujasite-type zeolites and investigated the pro ducts, inter alia, by IR spectroscopy. Cobalt-phthalocyanine encapsulated in zeolite EMT was prepared and, inter alia, characterized via IR spectroscopy by Ernst et al. (cf. [846] and references to related work therein). A number of typical bands of CoPc-EMT in the mid infrared (1600-1200 cm ) were observed and interpreted. 

Balkus et al. [847] applied the IR/KBr pellet technique and reported on the characterization of Rh(III)-salen ship-in-the-bottle complexes encapsulated in zeolite X and Y zeolites. In their more recent, excellent review article on Raman spectroscopy on zeolite systems, de Vos et al. [848] made reference to the formation and Raman characterization of complexes such as Ru-2,2 -bipyridine (cf. also [849]) and related compounds as well as to zeolite-confined Schiff bases, e.g., [Mn(salen)OH], in Na-Y, (cf also the IR study in Ref [848]). IR spectra of Na(I)-salen and Pd(II)-salen complexes in zeolite Y were shown in [850]. 

Similarly, Zhan and Li [851] synthesized and characterized by Raman spectroscopy Mn(II)-l,10-phenanthroline complexes in Y-type zeolites. Selenium chains and rings confined in voids of various zeolites (zeolite A, zeolite X, mor-denite, chabazite, and cancrinite) were studied by Raman spectroscopy in the range 300-100 cm in the contribution of Poborchii [852]. 

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