Synthesis, molecular structures, Mossbauer and electrochemical investigation of ferrocenyltelluride derivatives: (Fc(2)Te(2))Fe(CO)(3)I-2 [(CO)(3)IFe(mu-TeFc)](2), CpFe(CO)(2)TeFc, CpFe(CO)(2)TeX(2)Fc (X = Br, I) and CpFe(CO)(2)(mu-TeFc)Fe(CO)(3)I-2

Depending on the ratio of the starting reagents, the interaction of [FcTeI] with Fe(CO)(5) gave complex (Fc(2)Te(2))Fe(CO)(3)I-2 (1) bearing an Fc(2)Te(2) ligand, or a dimeric complex [(CO)(3)IFe(mu-TeFc)](2) (2). An interaction of equimolar amounts of [CpFe(CO)(2)](2) and Fc(2)Te(2) under the thermal conditions in toluene afforded CpFe(CO)(2)TeFc (3). Complex 3 can be easily halogenated at the Te center by elemental bromine and iodine to give monomeric CpFe(CO)(2)TeX(2)Fc (X = Br (4), I (5)). Complex 5 can be prepared alternatively via formal insertion of [FcTeI] into Fc-I bond of CpFe(CO)(2)I. Complex 3 readily substitutes one carbonyl in Fe(CO)(4)I-2 to give the adduct CpFe(CO)(2)(mu-TeFc)Fe(CO)(3)I-2 (6). (C) 2014 Elsevier B.V. All rights reserved