cis-Dioxido-molybdenum(VI) complexes of tridentate ONO hydrazone Schiff base: Synthesis, characterization, X-ray crystal structure, DFT calculation and catalytic activity

Abstract

C NMR and electronic spectra. The structure of complexes has been accomplished by single crystal X-ray diffraction. All experimental results confirmed that both complexes have an octahedral geometry around the Mo(VI) central atom, which is coordinated by the donor atoms of the dianionic hydrazone ligand, two oxido groups and oxygen/nitrogen atoms of solvent molecules. Computational studies were also performed using DFT calculations at B3LYP/DGDZVP level of theory. Furthermore, their catalytic activities were investigated on the electrophilic reaction of indole with aldehydes in molten tetrabutyl ammonium bromide (TBAB) to obtain bis(indolyl)methane derivatives.

Synthesis and DFT calculation on novel derivatives of Bis (indolyl) methanes

“…One of the interesting field of academic research is synthesis and theoretical investigation of structural parameter of different organic and inorganic compound [17e19]. In order to importance and vide range application, however, reports on the structure parameters and spectroscopic properties of Bis (indolyl) methanes are interesting and demanding [20,21]. Therefore, in the present paper we continue our research program on deep investigation of organic compound [22e24].…”

New magnetic supported hydrazone Schiff base dioxomolybdenum (VI) complex: An efficient nanocatalyst for epoxidation of cyclooctene and norbornene

“…Free H 2 L displays three bands at 1606, 1636 and 3302 cm −1 due to ν (C=N), ν (C=O) and ν (NH), respectively . The absence of bands at 3302 (ν (NH)) and 1636 (ν (C=O)) cm −1 in the spectrum of the complex confirms that free H 2 L exists in the keto form while in the complex, it coordinates to the Mo center in the deprotonated enolate form . In the IR spectrum of the complex, the C=N moiety shifts to higher wavenumber (1614 cm −1 ), indicating the involvement of azomethine nitrogen in coordination to the metal center .…”

“…In the spectrum of H 2 L, the bands appearing at 206 and 221 nm can be attributed to the π‐π* transitions of the aromatic rings. Also, the other bands which observed at 318 and 387 nm may be related to π‐π* and n‐π* transitions of the azomethine and amide moieties of the ligand . Comparison of the absorption bands of the complex with that of free ligand shows a shift, indicating the chelation of the ligand.…”

2-(2-(2-Hydroxybenzyliden) Hydrazinyl)-2-Oxo-N-(Pyridine-2-Yl) Acetamide Complexes: Synthesis, Characterization and Biological Studies

“…While; the electronic spectra of complexes (in DMSO solution) was recorded using a Perkin Elmer Lamda 25 UV/Vis Spectrophotometer. 1 H,…”

“…They can be described by the following general structure R 2 C = NNR 2 . Hydrazone ligands and their metal complexes were attracted many authors because of their varied applications in biological, pharmaceutical, analytical, catalytic [1][2][3][4][5] and industrial fields. Hydrazones and their coordination compounds play important roles in treatment of different diseases.…”