Abstract
The structure of (μ-1κN:2(η2),κ2 N,N'-(2-{[2,6-bis(propan-2-yl)phen-yl]aza-nid-yl}eth-yl)[2-(1H-inden-1-yl)eth-yl]aza-nido)(1,4,7,10,13,16-hexa-oxa-cyclo-octa-dec-ane-1κ6 O)lithiumtin, [LiSn(C8H16O4)(C25H31N2)], at 100 K has monoclinic (P21/n) symmetry. Analysis of the coordination of the Sn to the indenyl ring shows that the Sn inter-acts in an η2 fashion. A database survey showed that whilst this coordination mode is unusual for Ge and Pb compounds, Sn displays a wider range of coordination modes to cyclo-penta-dienyl ligands and their derivatives.
Highlights
The structure of (-1N:2(2),2N,N0-(2-{[2,6-bis(propan-2-yl)phenyl]azanidyl}ethyl)[2-(1H-inden-1-yl)ethyl]azanido)(1,4,7,10,13,16-hexaoxacyclooctadecane-16O)lithiumtin, [LiSn(C8H16O4)(C25H31N2)], at 100 K has monoclinic (P21/n) symmetry
A database survey showed that whilst this coordination mode is unusual for Ge and Pb compounds, Sn displays a wider range of coordination modes to cyclopentadienyl ligands and their derivatives
We have sought to install NHSns into a tethered ligand system using a fluorenyl group linked to the NHSn with a C2H4 linker, but this resulted in dimeric species with Sn—N dative bonding, even upon addition of suitable Rh salts (Rosello -Merino & Mansell, 2016)
Summary
N-heterocyclic stannylenes (NHSns) are the tin analogues of N-heterocyclic carbenes (NHCs). They have been found to be thermally unstable (GansEichler et al, 2002, Gans-Eichler et al 2006), but with a saturated backbone they are thermally robust (Mansell et al, 2008) and show interesting binding properties including a higher propensity for bridging coordination modes (Mansell et al, 2011). We have sought to install NHSns into a tethered ligand system using a fluorenyl group linked to the NHSn with a C2H4 linker, but this resulted in dimeric species with Sn—N dative bonding, even upon addition of suitable Rh salts (Rosello -Merino & Mansell, 2016). In this contribution we analyse the crystal structure of a monomeric NHSn with an indenyl donor group
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