Syntheses of dibenzo-18-crown-6 lariat isomers and their complexation with lanthanoid nitrates |
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| Authors: | Ying-Wei Yang Heng-Yi Zhang |
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| Institution: | Department of Chemistry , State Key Laboratory of Elemento-Organic Chemistry, Nankai University , Tianjin, China |
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| 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 + .  | |
| Keywords: | dibenzo-18-crown-6 lanthanoid ion complexation selectivity titration |
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