Nuclearity growth of new Pd^II complexes induced by the electronic effect of selenium-containing ligands

Abstract

This work provides a systematic study of how the electronic effect of EDG or EWG in selenium-containing ligands influences the nuclearity of PdII complexes. The solid-state, solution and gas phase behaviors were evaluated for the complexes.

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

“…Interestingly, the Pd–Y bonds to the symmetry-generated chalcogenolato ligands are each elongated by approximately 0.06 Å compared to the values found in the chelates. This difference is clearly a result of chelate formation with the tridentate ligands and represents a special situation in such clusters, where usually a more symmetric environment around the bridging chalcogenolates is found. , The relative elongation of the Pd–Te bond is ca. 2%, while that of the Pd–Se bond is 3%.…”

“…Gyrobifastigium is the common geometry adopted by such tetrameric palladium compounds with four bridging chalcogen donors . Nevertheless, such compounds are rare, especially with chelating or functionalized chalcogenolates, because a higher denticity or substituents with varying electronic parameters of the ligands frequently lead to smaller clusters. ,, Generally, two of the neighboring ligand backbones point to the same side, while the two remaining ligands point to the opposite direction. The four palladium atoms essentially span a compressed tetragonal bisphenoid (a nonregular tetrahedron), which is intersected by the square plane of the chalcogen atoms.…”

“…(Pd) = 2.05 Å] . Frequently, such short contacts are discussed as constructive Pd···Pd interactions or even as Pd–Pd bonds. ,,, They represent the short sides of a distorted Pd 4 tetrahedron formed by isosceles triangles, as is shown in Figure d. The isosceles sides of the triangles are ca.…”

“…The ongoing development of the coordination chemistry of nickel, palladium, and platinum triads with chalcogen-containing ligands is frequently stimulated by the catalytic activity, − structural flexibility, and bioactivity of the obtained products. , This also includes the cluster chemistry of these metals. − The nuclearity and bonding modes inside such multinuclear units are frequently controlled by the nature and size of the organic ligands used. A widespread class of ligands that bind well to many metals are Schiff bases.…”

“…This difference is clearly a result of chelate formation with the tridentate ligands and represents a special situation in such clusters, where usually a more symmetric environment around the bridging chalcogenolates is found. 8,9 The relative elongation of the Pd−Te bond is ca. 2%, while that of the Pd−Se bond is 3%.…”