Soft–Soft Interactions of Iodide and Triiodide Ions with Triphenyltelluronium Cations

Crystal structure of N'-[2-(benzo[d]thia-zol-2-yl)acet-yl]benzohydrazide, an achiral compound crystallizing in space group P1 with Z = 1

In the mol-ecule of the title compound, C16H13N3O2S, one hydrazinic nitro-gen atom is essentially planar, but the other is slightly pyramidalized. The torsion angle about the hydrazinic bond is 66.44 (15)°. Both hydrazinic hydrogen atoms lie anti-periplanar to the oxygen of the adjacent carbonyl group. The mol-ecular packing is a layer structure determined by two classical hydrogen bonds, N-H⋯O=C and N-H⋯Nthia-zole. The space group is P1 with Z = 1, which is unusual for an achiral organic compound.

Experimental evidence for hypercoordination in triorganotelluronium halides with 2-(Me2NCH2)C6H4 groups

Triorganotelluronium halides of type [{2-(Me₂NCH₂)C₆H₄}_nPh_3−nTe]⁺X⁻ (n = 1–3, X = Cl, Br, I) were prepared and structurally characterized both in solution and in the solid state, showing a (C,N)-chelating behavior of the 2-(Me₂NCH₂)C₆H₄ groups.

Synthesis, characterization, and ligand behaviour of a new ditelluroether (C10H7)Te(CH2)4Te(C10H7) and the concurrently formed ionic [(C10H7)Te(CH2)4]Br

The reaction of 1-naphthyl bromide with n-butyl lithium, elemental tellurium, and 1,4-dibromobutane in THF affords both (C₁₀H₇)Te(CH₂)₄Te(C₁₀H₇) (1) and [(C₁₀H₇)Te(CH₂)₄]Br (2) in good yields. 1 is preferentially formed at low temperatures and is a rare example of a structurally characterized ditelluroether in which the tellurium atoms are bridged by a hydrocarbon chain. In the solid state, 1 shows secondary bonding TeTe interactions, which connect the molecules into layers which are further linked to 3-dimensional frameworks by TeH hydrogen bonds. [(C₁₀H₇)Te(CH₂)₄]Br (2) is formed concurrently during the synthesis of 1 and is the main product, when the reaction is carried out at room temperature. The revPBE/def2-TZVPP calculations of the reaction profiles indicate that the formation of 2 is somewhat more favourable than that of 1. Furthermore, at room temperature the activation energy for the formation of 2 is lower than that of 1. At low temperatures the activation energy of the reaction leading to 1 is lower than that to 2, which is consistent with the synthetic observations. When 1 was treated with CuBr, [Cu₂(μ-Br)₂{μ-(C₁₀H₇)Te(CH₂)₄Te(C₁₀H₇)}₂] (3) was formed. It crystallizes as two polymorphs (3a) and (3b) in which both the packing and the conformation of the ditelluroether ligands are different. The reaction of 1 with HgCl₂ produces [(C₁₀H₇)Te(CH₂)₄]₂[HgCl₄]·CH₂Cl₂ (4·CH₂Cl₂) and that of 1 with CuCl₂ affords [(C₁₀H₇)Te(CH₂)₄]Cl (5). 2 and 5 are isomorphous.