Abstract
(η 5-1,3,5-trimethyl-6-phenylcyclohexadienyl)(η 5-cyclopentadienyl)Fe ( 9) was synthesized via reaction of phenyllithium with [(cyclopentadienyl)(mesitylene)Fe][PF 6]. 9 crystallized from hexanes in the monoclinic space group P2 1/ n with a 8.5703(5), b 8.5283(9), c 21.8436(23) Å, β 93.868(6)° and D calc 1.327 g cm −3 for Z = 4. Least-squares refinement gave a conventional R value of 0.035 for 2046 independent observed reflections. The structure reveals that the phenyl moiety added in the expected exo fashion and that the Fe-ring distances are statistically identical, averaging 2.059(3) and 2.06(3) Å for the cyclopentadienyl and cyclohexadienyl moieties, respectively. A comparison with other mixed iron(II) full-sandwich complexes is made in an attempt to determine relative π-back bonding abilities of the four isoelectronic π-ligands: arene, cyclopentadienyl, pentadienyl, and cyclohexadienyl.
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