The use of sterically demanding ligands to enforce low-coordination geometries upon d-and f-block metal centres remains an area of interest for inorganic chemists. Such complexes are typically highly reactive and thus capable of acting as a catalyst or activating small molecules. These complexes can also display unusual physical properties, such as single molecule magnet (SMM) behaviour. The use of amides as sterically demanding ligands dates to the 1960s, with the use of the [N(SiMe3)2] - ligand to isolate two-coordinate d-block complexes. Since then, a wide array of bulky silylamide ligands have been developed and utilized, such as [N(Dipp)(SiMe3)] -. More recently, the exceedingly bulky [KN(Si i Pr3)2] has been applied to the synthesis of linear f-block species, which display large magnetic anisotropy and have the potential for extremely high Ueff values (Ueff = barrier to magnetization, as well as group 2 Lewis acidic cations. Most recently, investigations of ( t Bu3Si)2NH showed the amide to be resistant to deprotonation even by n BuLi/KO t Bu superbase mixtures. However, coordination of ( t Bu3Si)2N -to Cs was achieved through the reaction with Cs 0 /THP electride solution (THP = tetrahydropyran) and the resulting ( t Bu3Si)2NCs complex was shown to undergo a metathesis reaction when reacted with LiI. While bulky silylamides are relatively well established, the corresponding phosphorus analogues have received considerably less attention. Studies with [P(SiMe3)2] -ligands afforded dimeric, rather than monomeric, structures due to the larger size of the P atom. To the best of our knowledge, the only two-coordinate metal bis(silylphosphanido) complexes to date are M[P(SiPh3)2]2 (M = Zn, Cd, Hg), prepared by Matchett et al. Here, the higher steric demands of the -SiPh3 group offset the larger P atom, allowing for isolation of monomeric species. Thus, we propose that the phosphorus analogue of the above-discussed [N(Si i Pr3)2] -ligand is of considerable interest due to its steric bulk, which should allow the isolation of monomeric complexes. While the [P(Si i Pr3)2] -ligand is known, it has scarcely been studied due to difficulties in its preparation. Westerhausen et al. prepared the Li salt [(THF)LiP(Si i Pr3)2]2 by first reacting n BuLi with PH3 in the presence of DME (DME = 1,2dimethoxyethane) to obtain (DME)LiPH2 in an 82-91% yield. This was then reacted i Pr3SiCl to afford P(Si i Pr3)3 (64%) and ( i Pr3Si)2PH (13%). Further reaction of the minor product ( i Pr3Si)2PH with n BuLi in THF afforded [(THF)LiP(Si i Pr3)2]2 in 83% yield, giving an overall yield from PH3 of at most 9.8%. Given the difficult and low-yielding synthesis, [(THF)LiP(Si i Pr3)2]2 was used to prepare only one complex, [(THF)4Li][( i Pr3Si)2PW(CO)5]. As such, the potential of this ligand is largely unexplored.