Lewis base properties of 1.lambda.5,3.lambda.5-diphospha-5-thia-2,4,6-triazines: crystal and molecular structures of (Ph4P2N3SPh)Me+ CF3SO3-

The behavior of Ph 4 P 2 N 3 SPh toward Lewis and Bronsted acids has been investigated, and the following adducts have been isolated: (Ph 4 P 2 N 3 SPh)H + BF 4 - , (Ph 4 P 2 N 3 SPh)Me + CF 3 SO 3 - , Ph 4 P 2 N 3 -SPh•BF 3 , and Ph 4 P 2 N 3 SPh•BCl 3 . The 31 p NMR spectrum reveals inequivalent phosphorus atoms, indicating that the methyl group is coordinated to a nitrogen atom between a phosphorus and a sulfur atom of the P 2 N 3 S ring. An X-ray structural determination has confirmed this assignment. The crystals of 6 are monoclinic and belong to the space group P2 1 /c