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- W2002318995 abstract "Abstract The complexation of the alkaline earth ions by four crown ethers in anhydrous propylene carbonate has been investigated by a competitive potentiometric method using lead(II) as an auxiliary ion. The ligand-12-crown-4 forms bis-adducts with all the alkaline earths, the maximum stability being exhibited by the calcium complex. A fifteen-membered macrocycle, 4-tert-butylbenzo-15-crown-5 also forms 1:2 complexes but only with Sr2+ and Ba2+. The larger ligands 4,4′(5′)-di-tert-butylbenzo-18-crown-6 and dibenzo-30-crown-10 bind strongly the alkaline earths, especially Sr2+ and Ba2+. Moreover, the stability of the 1:1 adducts with dibenzo-30-crown-10 decreases regularly from Ba2+ to Mg2+. The complexation trends are interpreted by taking into account the known structures of macrocyclic complexes in the solid. Finally, the stability of the adducts with the alkali metals, the alkaline earths and the di- and trivalent lanthanides are compared." @default.
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- W2002318995 date "1982-01-01" @default.
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- W2002318995 title "On the complexation of alkaline earth metal cations in propylene carbonate by macrocyclic crown ethers featuring from four to ten coordinating sites" @default.
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- W2002318995 doi "https://doi.org/10.1016/s0020-1693(00)91162-9" @default.
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