PSbP Ligand: Platform for a Stibenium to Transition-Metal Interaction.

The coordination chemistry of cationic divalent pnictogen ligands, such as nitrenium and phosphenium, has been well-explored in recent years. However, corresponding studies of a heavier congener, stibenium ion, are rare. To better facilitate a Sb-metal interaction, a tridentate P-Sb-P ligand with two phosphine buttresses was designed and synthesized, and its coordination chemistry toward late transition metals was investigated.

Te4Se2O6 macrocycle stabilizing triangular planar and tetrahedral anions.

The anion exchange reactions of Cl-macrocycle 1a [(p-MeO-C6H4)2Te)2(μ-O)(μ-PhSeO2)(μ4-Cl)]2 with AgNO3, AgClO4 and AgBF4 yielded colourless solids whose single crystal X-ray diffraction studies revealed the formation of 12-membered macrocycles [(p-MeO-C6H4)2Te)2(μ-O)(μ-PhSeO2)(μ-X)]2 [X = NO3 (2), ClO4 (3), BF4 (4)]. ESI-MS studies revealed that macrocycles 2–4 retain their integrity in solution. The solution (125)Te NMR spectrum of 4 shows the appearance of a triplet ((1)JTe···F = 568 Hz) that can be assigned to coupling between (125)Te nuclei and two fluorine atoms in BF4(−) ions.

Assembling anionic Sb(V)/(III) containing polyoxostibonates stabilized by triphenyltellurium cations.

Reactions of diphenyltellurium oxide with organostibonic acid and polymeric triphenylantimony oxide have been investigated independently. Single crystal X-ray diffraction studies have revealed the formation of novel and rare mixed valent Sb(v)/(iii) containing polyoxostibonates {(C6H5)3Te}2{Na2(H2O)2(p-Br-C6H4Sb(V))10(Sb(III))4[(C6H5)2Te]4(O)30(OH)4} and {(C6H5)3Te}4{[(C6H5)2Sb(V)]4(Sb(III))4(O)12(OH)4} . Solution (125)Te NMR supports the solid state structures presented.