Syntheses and Characterization of Tin(II) Complexes Containing 10-π-Electron Ring Systems

The compounds [( i -Pr) 2 ATI]SnCl ( 1 ) and {[( i -Pr) 2 ATI]Sn}[η 5 -C 5 H 5 )ZrCl 2 (μ-Cl 3 )ZrCl 2 (η 5 -C 5 H 5 )] ( 2 ) in which [( i -Pr) 2 ATI] = N -isopropyl-2-(isopropylamino)troponimine have been prepared and characterized by 1 H, 13 C, and 119 Sn NMR spectroscopies and X-ray crystallography. Compounds 1 and 2 feature heterobicyclic C 7 N 2 Sn ring systems with basically three- and two-coordinate tin atoms, respectively. Solid state structures of 1 and 2 show weak Sn···Cl interactions. The 119 Sn NMR signal of 2 appears at a significantly lower field compared to that of 1 . This is consistent with the reduction in coordination number at the Sn center of 2 . The 1 H NMR data also provide evidence for the formation of a more symmetric solution species with the removal of Cl - from 1 . X-ray structural features of C 7 N 2 Sn moiety in [( i -Pr) 2 ATI]SnCl and the {[( i -Pr) 2 ATI]Sn} + cation are very similar. The Sn−N bond distances of {[( i -Pr) 2 ATI]Sn} + cation are not indicative of any significant Sn−N multiple bonding. The π-electrons of the C 7 N 2 Sn ring system, therefore, appears to be mostly delocalized over nitrogen and carbon atoms.