Synthesis and structure of (η5-C5H5)3Dy·OC4H8

Abstract Reaction of a 1/3 mole ratio of DyCl 3 and NaC 5 H 5 in THF solution resulted in the formation of (η 5 -C 5 H 5 ) 3 Dy·THF. The compound crystallized in the monoclinic space group P 2 1 / n with unit cell constants a =8.247(4), b =24.582(5), c =8.318(6) A, β=101.49(7)° and D c =1.69 g cm −3 for Z =4. Full-matrix least-squares refinement has led to a final R value of 0.046 based on 2214 independent observed reflections. The THF molecule is coordinated to the dysprosium atom at a DyO distance of 2.522(5) A. The DyC(cyclopentadienyl) bond lengths range from 2.649(2) to 2.816(9) A. A comparison of some significant structural parameters along the isostructural series Cp 3 Ln·THF (LnLa, Pr, Nd, Gd and Dy) with the crystal radii was made.