Reactions of Schiff Base‐Substituted Diselenides and ‐tellurides with Ni(II), Pd(II) and Pt(II) Phosphine Complexes

Abstract

The salicylidene Schiff bases of bis(2-aminophenyl)diselenide and-ditelluride react with [M II Cl 2 (PPh 3) 2 ] (M = Ni, Pt) or [Pd II (OAc) 2 (PPh 3) 2 ] with formation of square-planar complexes with the general formulae [M II (L Y)(PPh 3)] (M = Ni, Pd, Pt, Y = Se, Te). The ligands coordinate to the metals as tridentate {O,N,Se/Te} chelates. The reduction of the dichalcogenides and the formation of the chalcogenolato ligands occurs in situ by released PPh 3 ligands. A mechanism for such reactions has been [a

Solvents and Ligands Matter: Structurally Variable Palladium and Nickel Clusters Assembled by Tridentate Selenium- and Tellurium-Containing Schiff Bases

“…As a result, the protons of the phenyl rings attached to the selenium and tellurium atoms are more deshielded than those of the phenolate ring. This is most likely caused by the presence of a stronger π and/or σ donor in the trans position to the imine compared to the phosphine in the corresponding [Pd­(L′ Y )­(PPh 3 )] complexes . Therefore, a considerable degree of back-donation into the π* orbital of the Schiff bases or less σ donation of the Schiff base nitrogen atoms can be assumed.…”

“…Recently, we developed a reliable method for the preparation of defined monomeric organochalcogenolato complexes from dichalcogenides via a reduction by intrinsically released phosphine ligands of nickel, palladium, platinum and rhenium starting materials. − …”

Bis(2-pyridyl)ditellane as a precursor to CoII, CuI and CuII complex formation: structural characterization and photocatalytic studies

“…1,9 Therefore, the formation of several tellurium compounds can result from the Te–Te or Te–C bond cleavage. 10–14…”

“…1,9 Therefore, the formation of several tellurium compounds can result from the Te-Te or Te-C bond cleavage. [10][11][12][13][14] Recently, our research group reported the synthesis and structural characterization of exotic pyridyltellurolate clusters, zwitterionic and coordination compounds using bis(2-pyridyl) ditellane (Fig. 1) as a precursor.…”

“…Experimental data and DFT calculations corroborated with the proposed mechanism. 10,11 Our interest in the study of the d block metal complexes with selenium and tellurium is due to their application in designing new materials. 18,19 Metal complexes containing pyridylselenium ligands have shown interesting properties in catalysis and antibacterial activity.…”