Bulletin of the Academy of Sciences of the USSR Division of Chemical Science p. 1828 - 1834 (1989)
Update date:2022-08-04
Topics:
Evreinov,V. I.
Baulin, V. E.
Vostroknutova, Z. N.
Bondarenko, N. A.
Syundyukova, V. Kh.
Tsvetkov, E. N.
Alkylation of o-(diphenylphosphinylmethyl)phenol by oligoethylene glycol ditosylates leads to a series of acyclic polyether complexing agents (podands) with phosphinylmethylphenyl terminal groups.A conductometric method in tetrahydrofuran-chloroform (4:1 by volume) has been used to determine the stability constants of the pobands with alkali metal 2,4-dinitrophenoxides.Several of the prepared ligands exhibited a high Li/Na, Na/K, and Li/K selectivity.For lithium and sodium cations, the curve of complex-forming ability against the overall number of donor centers in the structure of the podand has a maximum for the case of tetraethylene glycol bis(o-diphenylphosphinylmethyl)phenyl ether.For lithium cations, this compound surpasses the crown ethers in terms of its effectiveness and is the most powerful of the phosphoryl-containing complexing agents.For potassium, rubidium, and cesium cations, the complex-forming ability increases with increase in the number of oxygen donor centers in the polyether chain of the ligand.
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