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Organometallic molecules in cyclodextrin receptors

The host-guest chemistry of organometallic cyclodextrin complexes has been reviewed [443, 443a] and will be surveyed only briefly here. [Pg.77]

The cavities of cyclodextrins can well accommodate the cyclopentadienyl and benzene rings and as a result many metallocenes and half-sandwich tt-complexes have been incorporated as guests. [Pg.77]

Ferrocene was the first organometallic guest incorporated and numerous spectroscopic and electrochemical studies have been performed on ferrocene, substituted ferrocene, and related metallocene (e.g. cobaltocene) inclusion complexes (444-469]. Half-sandwich cyclopentadienyl- and benzene-metal carbonyl complexes have also been studied quite extensively [470-479] as have // -allyl metal (palladium) complexes [480], diene metal (rhodium) complexes [481-484], acetylene cobalt carbonyl cluster complexes [485], and complexes with metal carbonyls, e.g. Fe(CO)5, Mn2(CO)io, and CoNO(CO)3 [485a]. [Pg.77]

X-Ray crystal structure investigations of the ferrocene-a-CD 1 2 complex [487] and of the [( 7 -C5H5)Fe( 7 -C6H6]+ complex [488] have established that e metallocenes are tilted relative to the six-fold axis of the cyclodextrin (by 42 for ferrocene and 33° for the sandwich cation). [Pg.77]

The geometric (size and shape) complementarity between the cyclodextrin host and the organometallic guest determines a well manifested selectivity in the formation of inclusion complexes and can be used for the separation of ferrocene from dime-thylferrocene (only the latter forms a complex with y5-CD) [471], and of (benzene)-chromium tricarbonyl, (7 -C6H6)Cr(CO)3 from (hexamethylbenzene)-chromium tricarbonyl, ( y -C6Me6)Cr(CO)3 (only the latter forms a complex with y-CD) [471], Cyclodextrin host-guest complexation also affords the resolution of hydroxyethylferrocene enantiomers [489]. [Pg.78]


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