Synthesis, spectral characterization and catalytic studies of new ruthenium(II) chalcone thiosemicarbazone complexes

Abstract

C NMR) methods. On the basis of data obtained, an octahedral structure was assigned for all of the complexes. The chalcone thiosemicarbazones behave as dianionic tridentate O, N, S donors and coordinate to ruthenium via the phenolic oxygen of chalcone, the imine nitrogen of thiosemicarbazone and thienol sulfur. The new complexes exhibit catalytic activity for the oxidation of primary and secondary alcohols to their corresponding aldehydes and ketones and they were also found to be efficient catalysts for the transfer hydrogenation of carbonyl compounds.

Spectral Characterization and 3D Molecular Modeling Studies of Metal Complexes Involving the O, N-Donor Environment of Quinazoline-4(3H)-one Schiff Base and Their Biological Studies

“…The band due to ν (C=N) group that was in the region of 1590–1578 cm −1 shows shift to the lower region which can be attributed to delocalisation of metal electron density ( t 2g ) to the π -system of the ligand inferred the involvement of azomethine nitrogen [ 21 ]. Band appeared in the region of 1714–1704 cm −1 due to ν (C=O) indicates the participation of the phenolic oxygen in complexation with metal ion [ 22 ]. Furthermore, the metal complexes displayed ν (M–N) and ν (M–O) bands in the regions of 552–545 cm −1 and 460–447 cm −1 which give the evidence for the coordination through carboxylato oxygen and azomethine nitrogen of the ligand HNMAMQ with the metal ions [ 23 , 24 ].…”

Epoxidation Processes by Pyridoxal Dioxomolybdenum(VI) (Pre)Catalysts Without Organic Solvent

“…[8] The [MoO 2 (L 1 )] n polymer can be converted to the corresponding mononuclear Although many previous contributions report on the catalytic activity of molybdenum species in alkene epoxidation, [3,4,10] only few deal with Mo-thiosemicarbazonato complexes. [6,11] Furthermore, the typical Mo:substrate ratio is 1:100 [12] and nearly all epoxida-tion reactions were performed in organic solvents. [2a,b,4,6,10,12-14] We have recently observed a solvent-free process using similar complexes (with a variety of ONO ligands), with high activity and high selectivity for the epoxidation of cyclooctene {for instance, up to 98% when using [MoO 2 A C H T U N G T R E N N U N G (SAP)] 2 , SAP= N-salicylidene-2 aminophenolato}, only when using a Mo:substrate ratio of 1:100.…”

(E)3-2-(1-(2,4-Dihydroxyphenyl)ethyldeneamino)phenyl)-2-methylquinazoline-4(3H)-one Schiff Base and Its Metal Complexes: A New Drug of Choice against Methicillin-ResistantStaphylococcus aureus

“…In the IR spectrum of Schiff base (DHPEAPMQ), a high intense strong band in the region of 1712–1702 cm −1 was assigned due to the carboxyl group of quinazoline ring (C=O), which shows a downfield shift of 20–30 cm −1 and indicates the participation of carboxylic oxygen upon complex formation [ 22 ].…”