Synthesis, characterization and structural studies of palladium(II) complexes with N-(aroyl)-N′-(2,4-dimethoxybenzylidene)hydrazines

Ortho-metallated ruthenium(III) complexes with some acid hydrazide based Schiff bases

“…As commonly observed for hexacoordinated complexes containing the {Ru(PPh 3 ) 2 } unit, the two bulky PPh 3 molecules occupy the remaining two axial sites [11,[28][29][30]. The N(2)-C(8) and C(8)-O bond lengths are consistent with the enolate (AN@C(O À )A) form of the amide functionality in the tridentate ligands [14,15,[26][27][28][29]. The five-membered chelate rings are highly planar.…”

“…Thus the amide functionality is in the enolate form and the ligand coordinates the metal ion through the amide-O and the imine-N to form a five-membered ring as commonly observed in the complexes with Schiff bases derived from acid hydrazides [14,15,[26][27][28][29]. A medium to strong band observed in the range 1564-1605 cm À1 is assigned to the conjugated AC@NAN@CA fragment of the ligand [14,15,[26][27][28][29]. Three strong bands observed in the ranges 741-747, 693-696 and 515-521 cm À1 indicate the presence of ruthenium bound PPh 3 .…”

“…We have been working on the Schiff bases (H 2 L) derived from acid hydrazides and aromatic aldehydes, which can act as monoanionic or bianionic tridentate aromatic-C, imine-N and amide-O donor ligands to provide cyclometallated complexes. Recently, we have reported some orthopalladated species with H 2 L [14,15]. These results prompted us to explore the possibility of using this Schiff base system for the synthesis of new ortho-metallated ruthenium species using the 16-electron starting material [Ru(PPh 3 ) 3 Cl 2 ].…”

Zeolite-Y entrapped bivalent transition metal complexes as hybrid nanocatalysts: density functional theory investigation and catalytic aspects

“…The spectra of H 2 SFCH shows a sharp and strong band at 1603 cm −1 due to ν(C = N) of the azomethine group. This band undergoes hypsochromic effect in the spectra of entrapped complexes, indicating coordination of the azomethine nitrogen (27). The ν(N-H) and ν(C = O) modes of the lateral chain in the uncoordinated Schiff base appearing at 3216 and 1680 cm −1 , respectively (28).…”

Cyclometallated ruthenium(II) carbonyl complexes with 1-pyrenaldehyde 4-R-3-thiosemicarbazones: Regioselective ruthenation of the 1-pyrenyl group

“…17 The Schiff bases obtained from monocyclic aromatic aldehydes can provide only ortho-metallated complexes having 5,5-membered fused chelate rings. [17][18][19][20] On the other hand, depending upon the position of the azomethine fragment, Schiff bases derived from polycyclic aromatic aldehydes can provide either of the ortho or the peri positions of the polycyclic aryl group (3-indolyl, 1-naphthalenyl or 1-pyrenyl) as the metallation site and form 5,5-or 6,5-membered fused chelate rings. [21][22][23][24][25][26] Generally peri-metallates of rhodium(III) 26 and palladium(II) [21][22][23]26 and orthometallates of ruthenium(III), 24,25 iridium(III) and platinum(II) 26 have been isolated with this type of ligands.…”