The synthesis and properties of a new linear NPN proligand

Following upon the synthesis of new proligands Me2NCH2XCH2NMe2(X = O or NMe), we have now prepared quarternised derivatives of the related phosphorus compounds, R2NCH2XCH2NR2(R = Me or Et, X = PPh). The ethyl compound can act as a phosphorus donor even when the nitrogen atoms are protonated, and we have characterised fully [NiBr4{PhP(CH2NHEt2)2}2][NiBr4] as well as a polymeric adduct of NiBr2 and thf, [{Ni3Br6(thf)5}n].