Tetratin(II) and barium tritin(II) tetrakis[mu(3)-tri-tert-butylsilylphosphandiide] compounds with a tetrametallatetraphosphacubane core

The metalation of tri-tert-butylsilylphosphane with bis[bis(trimethylsilyl) amino] stannylen yields nearly quantitatively the tetrameric tin(II) tri-te rt-butylsilylphosphandiide with a central Sn4P4 cubane moiety. Barium bis[t ri-tert-butylsilylphosphanide] is accessible via the reaction of tri-tert-b utylsilylphosphane with barium bis[bis(trimethylsilyl)amide] in the molar r atio 2:1. This phosphanide reacts with his [bis(trimethylsilyl)amino] stann ylen to give barium tritin(II) tetrakis[mu(3)-tri-tert-butylsilylphosphandi ide]. Crystallographic data of 1: P 2(1)2(1)2(1), T = 193 K, a = 1532.6(3), b = 2120.2(4), c = 2194.0(5) pm, V = 7.129(3) nm(3), Z = 4, R-1 = 0.0360 ( 9132 observed data [I > 2 sigma(I)]), wR2 = 0.1064 (all data); crystallogra phic data of 3: P 2(1)/c, T= 193 K, a = 1927.35(1), b = 1799.27(2), c = 220 1.35(2) pm, P = 93.010(1)degrees V = 7.6234(1) nm(3), Z = 4, R-1 = 0.0321 ( 11993 observed data [I > 2 sigma(I)]), wR2= 0.0772 (all data).