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Substituent Effects on 31 P NMR Chemical Shifts and 1 J P–Se of triarylselenophosphates

2010; Taylor & Francis; Volume: 185; Issue: 4 Linguagem: Inglês

10.1080/10426500902953979

1563-5325

Zaira Domínguez, Javier Hernández, Lorena Silva-Gutiérrez, M. Salas, Mario Sánchez, Gabriel Merino,

Synthesis and Reactivity of Sulfur-Containing Compounds

The effect of electron-withdrawing (EW) and electron-releasing (ER) substituents on the 31P NMR chemical shifts and the structural parameters of a series of tris-(p-X-aryl)selenophosphates is reported in this article. Similarly to O-aryl phosphates and O-aryl thiophosphates, EW groups attached to aromatic rings induce a shielding effect on the 31P NMR signal. After a detailed experimental and theoretical analysis, we confirmed that the selenium atom is the main part responsible for the charge density transfer toward phosphorus through a back-bonding effect. The obtained 1JP-Se values for the complete series agree with this observation. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file.