Synthesis and Crystal Structure of (2,4-C_7H_(11))_3Ln(Ln=Dy,Er)

The reaction of LnCl 3 with two equivalents of 2,4-dimethyl-pentadienyl potassium affords (2,4-C 7H 11 ) 3Ln(Ln=Dy,Er). The compound (2,4-C 7H 11 ) 3Dy(1), crystallized from a mixed solvent of hexane and THF has a triclinic space group Pl with a =1 270 2(2) nm, b = 1 290 8(2) nm, c =0 847 9(2) nm, α =91 48(2)°, β =108 41(2)°, γ =118 41(2)°, Z =2. The compound (2,4-C 7H 11 ) 3Er(2) was crystallized from toluene in triclinic P l- with a =0 909 5(3) nm, b =1 407 2(3) nm, c =1.657 7(6) nm, α =106 66(2)°, β =93 77(3)°, γ =89 76(2)°, Z =4. Both structures were solved by using direct methods and refined by block-matrix least-squares to final values of R =0 039 for 1 and R =0 067 for 2. A comparison of some significant structural parameters in (2,4-C 7H 11 ) 3Ln(Ln=Dy,Er) with those from other analogues (2,4-C 7H 11 ) 3Ln(Ln=Nd,Gd) was made.