[Li{N(Me3SiNPPh2)2}]2.2.5C7H8

Cyclometalation and coupling of a rigid 4,5-bis(imino)acridanide pincer ligand on yttrium

“…Compared to the relatively flat ligand backbones of H[AIm 2 ], 1, and 2, the ligand backbone in Li 2 [AIm 2 ] 2 has a 139°angle between the two aryl rings, and the central nitrogen-containing ring adopts a boat conformation. The Li(1)-Li(1)* distance of 2.474(6) Å is shorter than the reported distance of 2.79(1) Å 40 for [Li 2 {μ-1κ 2 :2κ 2 -N(PPh 2 NSiMe 3 ) 2 } 2 ], which exhibits similar connectivity to Li 2 [AIm 2 ] 2 , but is similar to the Li-Li distance of 2.494(6) Å in [Li 2 {μ-1κ 2 :2κ 2 -N(SiMe 2 NEt 2 ) 2 } 2 ] which features an acute Li-Si-Si-Li torsion angle of 38°a round the central anionic nitrogen donors. 41 The geometry at lithium is distorted tetrahedral with a 63.5°angle between the N(1)-Li afforded computed transition energies in reasonable agreement with experimental results (Fig.…”

Experimental and theoretical characterization of the Zn—Zn bond in [Zn2(η5-C5Me5)2]

“…Solution and standard (spherical atoms) refinement were made using the WinGX program package (Farrugia, 2005). Some disorder in the methyl groups was observed during the refinement and therefore some were split into two components in order to prevent them from being non-positive definite using the usual constraints (Van der Maelen Uría & Sheldrick, 1996;Van der Maelen Uría, 1999). Further details for this experiment are given in (Tables S1 and S2).…”

[P,P-Di-tert-butyl-N-trimethylsilyl-P-(trimethylsilylamino)phosphine imidato-κ2N,N′]bis(pyridine-κN)lithium(I)

“…While there are several other recently reported examples of compounds containing an NÐPÐN anionic chelate bound to Li, most of these involve P III rather than P V , and many have been characterized as dimers or clusters (Lawson et al, 2000;Brask et al, 1999;Schranz et al, 1998;Raithby et al, 1997;Van der Maelen Urõ Âa et al, 1994;Detsch et al, 1992). Distorted tetrahedral geometry is found about the Li atom in all of these structures, although the bond distances vary with the coordination environment.…”