U. Riese et al., PHOSPHORANEIMINATO COMPLEXES OF MANGANESE, IRON, AND COBALT WITH HETEROCUBANE STRUCTURES, Phosphorus, sulfur and silicon and the related elements, 125, 1997, pp. 315-321
The phosphoraneiminato complexes [MnBr(NPEt3)](4) 3, [FeCl(NPEt3)](4)
4 and [CoBr(NPEt3)](4) 5 were built from the element halides MX, and e
xcess trimethylsilyltriethylphosphoraneimine in the presence of potass
ium fluoride. They form shiny orange (M = Mn), dark brown (M = Fe), an
d dark green (M = Co) crystals. According to single crystal structure
determinations these compounds form M4N4 heterocubane frameworks with
mu(3)-N-bridges and M-N bond lengths of 213.4 pm (M = Mn), 205.7 pm (M
= Fe), and 204.4 pm (M = Co) which lead to intermetallic distances of
295.7 pm (M = Mn), 272.9 pm (M = Fe), and 279.0 pm (M = Co).