The reaction of Te2- with three equiv of Fe(CO)(5) leads to formation of [Fe-3(CO)(9)(mu(3)-Te)](2-) (I) in nearly quantitative yield. The structure consists of a three-iron triangle capped by a telluride. : Since the compound could be prepared so easily, its reactivity was probed toward a variety of electrophiles, particularly in regard to the reactivity of the lone pair of electrons presumed to reside on the apical telluride. One or two equivalents of acids results in addition of protons across Fe-Fe bonds, while NO+ leads to displacement of one CO and formation of [Fe-3(CO)(8)(NO)(mu(3)-Te)](-). Softer electrophiles such as PPh(3)Au(+) and PhHg(+) also simply add across an Fe-Fe edge of the cluster to form a salt of [Fe-3(CO)(9)(mu(3)-Te)(mu-AuPPh(3))](-) (II). Thus, none of the electrophiles investigated appear to react with the apical telluride. Molecule I also reacts with oxidants as well. Air oxidation of an initial reaction mixture of Fe(CO)(5) and Te2- results in formation of low yields of a Salt of [(Fe(CO)(4))(4)Te](2-) (III). This compound appears to be a byproduct, rather than a result, of a reaction of I with O-2. One equivalent of I-2 leads to formation of a salt of [Fe3Te2(CO)(9)I](-) (IV), which is isostructural with the well-known Fe3Te2(CO)(10). Crystal structure data : for [(C6H5)(4)P](2)[Fe-3(CO)(9)(mu(3)-Te)] (I), monoclinic, P2(1)/n, a = 11.034(3) Angstrom, b = 22.214(8) Angstrom, c = 21.980(8) Angstrom, beta = 97.72(3)degrees V = 5339(3) Angstrom(3), Z = 4, R = 0.0819, R(w) = 0.097; for [(C6H5)(4)P][Fe-3(CO)(9)(mu(3)-Te)(mu-AuPPh(3))] (II), monoclinic, P2(1)/c, a = 16.970(5) Angstrom, b = 13.996(4) Angstrom, c = 21.108(8) Angstrom, beta = 95.25(3)degrees, V = 4992(3) Angstrom(3), Z = 4, R = 0.0507, R(w) = 0.0579; for [(C6H5)(4)P](2)[(Fe(CO)(4))(4)Te] (III), monoclinic, C2/c, a = 14.264(4) Angstrom, b = 19.719(5) Angstrom, c = 22.937(10) Angstrom, beta = 90.55(3)degrees, V = 6451(3) Angstrom(3), Z = 4, R = 0.0454, R(w) = 0.0524; for [(C6H5)(4)P][Fe3Te2(Co)(9)I] (IV), triclinic, P $($) over bar$$ 1, a = 9.614(1) Angstrom, b = 14.511(2) Angstrom, c = 14.668(2) Angstrom, alpha = 74.47(1)degrees, beta = 71.14(1)degrees, gamma = 83.22(1)degrees, V = 1852.7(5) Angstrom(3), Z = 2, R = 0.0398, R(w) = 0.0542.