STRUCTURE AND REACTIVITY OF IRON(0)-PHENYLTELLUROLATE [PPN][PHTEFE(CO)4]

Anionic iron(0) tetracarbonyl with terminal phenyltellurolate ligand PhTe-, [PhTeFe(CO)4]-, has been synthesized and characterized. The title compound was obtained by addition of (PhTe)2 to [PPN][HFe(CO)4] THF solution dropwise. [PPN][PhTeFe(CO)4] crystallizes in the monoclinic space -roup C c, with a = 16.119(4) angstrom, b = 13.141(3) angstrom, c = 19.880(8) angstrom, beta = 93.04(3)-degrees, V = 4205(2) angstrom3, and Z = 4. The [PhTeFe(CO)4]- anion is a trigonal-bipyramidal complex in which the phenyltellurolate ligand occupies an axial position with Fe-Te bond length 2.630(5) angstrom and the Fe-Te-C(Ph) angle is 103.4(5)-degrees. The neutral iron(0)-telluroether compound, (PhTeMe)Fe(CO)4, was prepared by alkylation of the [PhTeFe(CO)4]-. Protonation of [PhTeFe(CO)4]- and reaction of H2Fe(CO)4 and (PhTe)2 Ultimately lead to formation of the known dimer Fe2(mu-TePh)2(CO)6 and H-2.