Some new amide complexes of thorium tetrachloride and N-thiocyanate

The amide complexes [ThCl4L3], where L = CH3CON(CH3)2 (dma), C2H5CON(CH3)2 (dmpa), C2H5CON(C2H5)2 (depa), or (CH3)3CCON(CH3)2 (dmpva), [Th(NCS)4L4], where L = dmpa, depa, dmiba ((CH3)2CHCON(CH3)2), or dmpva, and [Th(NCS)4 (dmpva)3] have been prepared and their ir spectra reported. The observations are discussed in terms of the steric crowding about the thorium atom using a cone-packing model.