Crown-Containing N-(Thio)Phosphoryl-(Thio)Ureas, their Ligand Properties and Analytical Application

Larisa G. Shaidarova Department of Chemistry, Kazan State University, Kazan, 420008, Russia

Larisa G. Popesku Department of Chemistry, Kazan State University, Kazan, 420008, Russia

Nikolay Department of Chemistry, Kazan State University, Kazan, 420008, Russia

A. Ulakhovich Department of Chemistry, Kazan State University, Kazan, 420008, Russia

Herman C. Budnikov Department of Chemistry, Kazan State University, Kazan, 420008, Russia

Nail G. Zabirov Department of Chemistry, Kazan State University, Kazan, 420008, Russia

Vasiliyv Brus'ko Department of Chemistry, Kazan State University, Kazan, 420008, Russia

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Abstract

Crown-containing N-(thio)phosphoryl(thio)ureas are related to a class of NH-acids due to the presence of two acceptor-groups: (thio)phosphorylic and (thio)acylic. In agreement with structure of lariat ether, it was observed a stage corresponding to the step ejection of two H* ion on the potentiometric titration curve of ligand by alkaline. Calculated step ionization constants demonstrate that these compounds are weak acids with relative values of pK₁ and pK₂.

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Crown-Containing N-(Thio)Phosphoryl-(Thio)Ureas, their Ligand Properties and Analytical Application

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Crown-Containing N-(Thio)Phosphoryl-(Thio)Ureas, their Ligand Properties and Analytical Application

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