Abstract: | Fc2B2(Br)(μ‐NPEt3)2]+Br– – a Ferrocenyl‐substituted Phosphoraneiminato Complex of Boron Fc2B2(Br)(μ‐NPEt3)2]+Br– has been prepared from ferrocenylboron dibromide, Fe(η5‐C5H5)(η5‐C5H4BBr2)], and the silylated phosphoraneimine Me3SiNPEt3 in dichloromethane solution to give orange‐red single crystals which were characterized by IR, NMR and 57Fe Mössbauer spectra, as well as by a crystal structure determination. Fc2B2(Br)(μ‐NPEt3)2]+Br– · 3 CH2Cl2 ( 1 · 3 CH2Cl2): Space group P21/n, Z = 4, lattice dimensions at –50 °C: a = 1370.6(3), b = 2320.9(5), c = 1454.4(2), β = 95.38(1)°, R1 = 0.061. In the cation of 1 the ferrocenyl‐substituted boron atoms are connected by the nitrogen atoms of the NPEt3]– groups to form a planar B2N2 four‐membered ring. One of the boron atoms having planar, the other tetrahedral coordination. |