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Syntheses of dibenzo-18-crown-6 lariat isomers and their complexation with lanthanoid nitrates
Authors:Ying-Wei Yang  Heng-Yi Zhang
Affiliation:Department of Chemistry , State Key Laboratory of Elemento-Organic Chemistry, Nankai University , Tianjin, China
Abstract:Two constitutional isomers of dibenzo-18-crown-6 derivatives (6 and 7) were synthesised and their binding behaviours towards trivalent lanthanoid cations (La3 + , Ce3 + , Pr3 + , Nd3 + , Sm3 + , Eu3 + , Gd3 +  and Tb3 + ) were investigated. Both isomers expressed better binding affinities towards Sm3 +  and Tb3 +  than a group of other lanthanoids, as measured by the ligand-to-metal charge-transfer (LMCT) band intensity at ca. 425 nm using UV–vis spectroscopic method. Additionally, the trans isomer 7 was shown to have a higher binding ability than the cis isomer 6 towards Tb3 + .

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Keywords:dibenzo-18-crown-6  lanthanoid ion  complexation  selectivity  titration
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