Phosphonitrilic derivatives. Part XXI. Complexes with metal carbonyls

Abstract

Octamethylcyclotetraphosphonitrile and decamethylcyclopentaphosphonitrile react with the hexacarbonyls of molybdenum and tungsten to give tricarbonyls L,M(CO)₃, co-ordination of the ligand occurring most probably through its nitrogen atoms. The octadimethylamido-derivative N₄P₄(NMe₂)₈ forms a tetracarbonyl L,W(CO)₄. The quaternary iodide N₄P₄Me₉I reacts with M(CO)₆(M = Cr or Mo) to give the salts [N₄P₄Me₉]⁺[M(CO)₅l]⁺, in which ¹H n.m.r. and i.r. spectra indicate donor–acceptor interaction between the ions.