Methylindium dialkylamido compounds: mono- and bis-dialkylamides involving four- and five-co-ordinated indium(III). X-Ray crystal structures of {Me2In[N(CH2)2N(Me)CH2CH2]}2, MeIn[MeNC(CH)4N]2, and MeIn{[MeN(CH2)2NMe]InMe2}2

Abstract

The synthesis of (Me₂InL)₂[L = [graphic omitted]H₂(1), N(C₆H₁₁)₂(2), and [graphic omitted]HMe (3)] is reported. The X-ray crystal structure of (1) shows an amido-bridged dimer; all the compounds appear as dimers in the mass spectra. Variable-temperature ¹H n.m.r. of (3) shows that it exists as two conformational isomers which do not interconvert at room temperature. The synthesis of MeIn[MeN[graphic omitted]]₂(4) and MeIn{[MeN(CH₂)₂NMe]InMe₂}₂(5) is also reported and their X-ray crystal structures show square-pyramidal, bis(dialkylamido)metal centres; (5) also contains two peripheral, distorted tetrahedral indium atoms.