Synthesis and Crystal Structure of （2,4—C7H11）3Ln（Ln=Dy,Er）

The reaction of LnCl3 with two equivalents of 2,4-dimethyl-pentadienyl potassiumaffords (2,4-C7H11)3Ln(Ln=Dy,Er). The compound (2, 4-C7H11)3Dy(1), crystallized froma mixed solvent of hexane and THF has a triclinic space group Pl with a=l. 270 2(2) nm,b=l. 290 8(2) nm, c=0. 847 9(2) nm, a=91.48(2)°, β=108.41(2)°, γ＇=118.41(2)°, Z=2. The compound (2,4-C7H11)3Er(2) was crystallized from toluene in triclinic P1- 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 ofsome significant structural parameters in (2,4-C7H11)3Ln(Ln=Dy,Er) with those from otheranalogues (2,4-C7H11) 3Ln (Ln = Nd, Gd) was made.