Syntheses and characterization of new dithiophosphinato zinc complexes

Abstract

Four known dithiophosphinic acids, DTPA, were synthesized and their zinc complexes were prepared as novelties. The complexes have been proven to have the structures [Zn(µ-DTPAⁿ)₂(DTPAⁿ)₂], ([DTPAⁿ]= Rⁿ(R)P(S)H, R= 4-CH₃O-C₆H₄-; R¹= iso-amyl-, DTPA¹; R²= iso-butyl-, DTPA²; R³= sec-butyl-, DTPA³; R⁴= iso-propyl-, DTPA⁴). The DTPAs were prepared by the reaction of the Lawesson reagent, [2,4–bis(4-methoxyphenyl)–1,3,2,4–ditiyodifosfetan–2,4–disülfür] (LR), with the corresponding Grignard compounds. The acids formed are viscous liquids difficult to purify and so they were converted to ammonium salts, [DTPAⁿ][NH₄], which are easy to obtain as pure crystals. The complexes were identified to have dimeric structures on the basis of mass spectroscopic data.

Keywords

• Dithiophosphinic Acid,Dithiophosphinate,Phosphinodithioic Acid,Dithiophosphinato Zinc Complex,Lawesson’s Reagent

References

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