Abstract
The crystal structures of [(η5-C5H4COOH)W(CO)3R] (R=Me, I) have been determined. They crystallize in two different monoclinic space groups. R=Me isP21/c,a=10.4833(6),b=8.0144(7),c=13.0731(6) A, β=93.147(4)°, andD(calc)=2.374 g-cm−3 forZ=4. R=I isP21/n,a=7.814(2),b=13.075(4),c=11.097(4) A, β=91.75(2)°, andD(calc)=2.953 g-cm−3 forZ=4. Both possess a “four-legged piano stool” geometry. The methyl ligand in the R=Me complex is disordered between two positions insyn oranti relative to the substituted carbon of the cyclopentadienyl ligand. The iodo ligand in the R=I complex is, however, exclusively insyn-position.
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