Diethylindium(III) derivatives: Synthesis and characterization of diethylindium(III) dialkylamides and diethylindium(III) pyrrolide. X-Ray crystal structures of diethylindium(III) pyrrolide and diethylindium(III) bromide

The compounds Et2InNR2 (R Me, Et, or SiMe3) and Et2InPyrr (HPyrr pyrrole) have been prepared by reaction of Et2InCl with the corresponding lithium amide or pyrrolide in diethylether. Their 1H NMR, IR and mass spectra are reported and discussed. The amides are dimers in the vapour phase. Diethylindium bromide is a layer polymer. The octahedral coordination geometry of indium is characterized by four distinct InBr distances ranging from 2.777(2) to 3.848(2) Å. Diethylindium pyrrolide has a chain structure as shown by the relatively short intermolecular interactions between each indium atom and the double bonds of two adjacent different pyrrole units (3.063(5) and 2.950(5) Å, respectively). The indium coordination geometry is then trigonal bipyramidal, with the shortest bonds in the equatorial plane (InC(5) 2.143(5) Å, InC(7) 2.141(5) Å, InN 2.166(4) Å).