Diphenyldichalcogenide complexes of iron, chromium and rhenium carbonyls

Crystals at a Carrefour on the Way through the Phase Space: A Middle Path

“…Analysis of the crystal structure of the 8-alkoxy-4-cyclooctenyl-tellurium tribromides 1 and 3 (see Scheme 1) demonstrated that, despite the fact that they are close homologues (R = Et (1) and Me (3)), they provide different self-assembly patterns in solid-state. In particular, ethoxy-homologues C8H12(TeX3)OEt (R = Et, X = Br (1), I (2)) are assembled into 1-D chains stabilized by Te-π(C=C) ChBs (3.479-3.577 Å) (see Figure 1a), while their chloro-(X = Cl, R = Et [10] and methoxy-(R = Me X = Br (3), I (4) congeners, form dimeric associates [11][12][13], stabilized by two Te---X ChBs (see Figure 2). The tellurium center in 1-2 can be described as a typical octahedral [14] (see Figure 1), with the sixth position of the octahedron occupied by a weakly associated C=C double bond.…”

Tricarbonylrhenium(I) Complexes with N‐Heterocyclic Thiones and Selenols

“…[34,35] Under the condition applied, the Se-Se bond undergoes a cleavage and the resulting pyridylselenolato ligands coordinate to the metal ions with formation of the dinuclear complex [Re 2 (CO) 6 (Sepy) 2 ]. Such cleavage reactions are not without precedent and have been applied for the synthesis of cluster compounds of mercury and indium by the reaction of appropriate diselenides with elemental metals.…”

The Unique Ambiphilicity of Tellurium in the [MesitylTe(I)(I2)(I3)]−Anion

“…The I22−Te3−I31 angle of 134.6(3) is significantly bent, but roughly resembles the bonding features found for the previously published anion [{(2,6−Me 2 Ph)Te(I)}−(I)−{Te(I)(2,6‐Me 2 PhTe)}] − , in which also an intermediate Te−(I)−Te angle of 148.5° was established, while in the related mixed‐valent Te(II)/Te(IV) compound {[(2,6‐Me 2 Ph)Te(I)}−(I)−{Te(I) 2 (2,6‐Me 2 Ph)}] the iodide bridge is almost linear with an Te‐I−Te angle of 178.7° [33] . Much smaller Te−(I)−Te angles between 90.2 and 99.9° are found when two Te(IV) centers are bridged [32,34–38] . But it should be mentioned that only one of these examples contains a single iodide bridge [32]…”