Organometallic Sulfur Complexes. IV^a. Synthesis and Characterization of [Fe(Bu^tC₅H₄)(CO)₂]₂ and [Fe(1, 3-di-Bu^tC₅H₃)(CO)₂]₂ and the S-Bonded Thiocarboxylate Derivatives, Fe(Bu^tC₅H₄)(CO)₂Scor and Fe(1, 3-di-Bu^tC₅H₃)(CO)₂Scor

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