Analytical methods

Beyond transition block metals: exploring the reactivity of phosphine PTA and its oxide [PTA(O)] towards gallium(iii)

“…Gallium( iii ) is a strong Lewis acid and typically coordinates electron-rich neutral or anionic donors (mainly O, N or S) forming stable complexes with coordination numbers from 3 to 6, depending on the nature of the surrounding ligands. 62,63 Although phosphines are considered to be soft bases binding preferably soft acids, the number of complexes obtained from the reaction of alkyl and aryl monodentate phosphines with trihalides of gallium is significant. 59 Di- and poly-phosphine adducts with gallium are also known, 64,65 as well as complexes with amino-diphosphine pincer ligands (PNP), which can coordinate the metal in tridentate NP 2 -fashion or bidentate P 2 -fashion, depending on whether the pincer is in the anionic or neutral form.…”