SYNTHESIS AND STRUCTURAL STUDIES ON SOME DIOXOMOLYBDENUM (VI) COMPLEXES BEARING 1-(1-HYDROXYNAPHTHALEN-2-YL) ETHANONE MOIETY

SYNTHESIS AND STRUCTURAL STUDIES ON SOME DIOXOMOLYBDENUM (VI) COMPLEXES BEARING 1-(1-HYDROXYNAPHTHALEN-2-YL) ETHANONE MOIETY

9^th International Conference on CHEMISTRY AND EURO GREEN CHEMISTRY
May 22-23, 2019 | Rome, Italy

Mai Mostafa A Hassan Shanab, Mohammad S El-Shahawib and Mohsen M Mostafac

Prince Sattam Bin Abdulaziz University, Saudi Arabia King Abdulaziz University, Saudi Arabia Mansoura University, Egypt

Scientific Tracks Abstracts : J Ind Environ Chem

Abstract:

A number of molybdenum complexes Cis-MoO₂(NE)₂.CH₃OH, Cis- MoO2(HRSB)2.nH2O {R= H, 4-Br, 4-OCH₃, 4-CH₃ and n= 0, 1, 2} Cis- MoO₂(HL) (acac)nH₂O {HL= HNEBH, HNEINH, HNENH, HNEPH, n=0,1}, Cis- [MoO₂(L\2.nH₂O], {L\= HNE-2-ABH, HNE-4-ABH, n = 0, 2} and Cis-[MO₂O₅(HNEAH)2] have been synthesized and characterization by magnetic, spectroscopic (FT-IR, 1H and 13C-NMR spectra) and electrochemical techniques. The complexes were made reaction of Cis-MoO₂(acac)2 with the ligands, (1-hydroxynaphthalen-2-yl)ethanone (HNE), 2-anmino-N/-(1-(1-hydroxynaphthalene-2- yl) ethylidene)benzohydrazide (HNE2-ABH), 4-anmino-N/- (1-(1-hydroxynaphthalene-2-yl)ethylidene)benzohydrazide(HNE4-ABH),N/-(1-(1-hydroxynaphthalene-2-yl) ethylidene)benzohydrazide (HNEBH), N-(1-(1-hydroxynaphthalene-2-yl)ethylidene)acetohydrazide (HNEAH), N/-(1-(1-hydroxynaphthalene-2-yl)ethylidene)nicotinohydrazide (HNENH), N/-(1-(1-hydroxynaphthalene-2-yl) ethylidene)isonicotinohydrazide(HNEINH),N/-(1-(1-hydroxynaphthalene-2-yl)ethylidene)picolinohydrazide (HNEPH), they coordinate as dibasic tridentate (OON) or (E)-2-(1-(phenylimino)ethyl)naphthalen-1-ol (HASB), (E)-2-(1-(p-tolylimino)ethyl)naphthalen-1-ol(HTSB),E-2-(1-(4-methoxyphenylimino)ethyl)naphthalen-1-ol (HMSB) and (E)-2-(1-(4- bromophenylimino)ethyl)naphthalen-1-ol (HBrSB) monobasic bidentate (NO). Both the molecular and the spectroscopic studies showed that, the complexes are octahedrally coordinated. The redox properties, of the electrode couples and the stability of some complexes towards reduction were linked to the electron withdrawing or ability releasing of the substituent in the Schiff bases and the hydrazones. Results show that, changes in E1/2 for the complexes due to remote substituent effects could be related to changes in basicity of the carbonyl oxygen of the hydrazide moiety in the hydrazone ligand. The electron-donating substituents stabilized Mo (VI) complexes while electron-withdrawing groups favored lower oxidation state of Mo (V) and/or Mo (IV) species. The nature of mechanism and kinetic parameters of the electroactive chelates are strongly dependent on the substituent. The EHOMO and ELUMO level of hydrazones, from both electrochemical and theoretical data also back-donation energy (ΔEback-donation), ionization potential (I), molecular dipole moment (µ), electronegativity (χ), softness (&sigmma;) electron affinity (A), global hardness (η) and electrophilicity index (ω) were calculated.

Biography:

Mai Mostafa A Hassan Shanab is an Assistant Professor in Department of Inorganic Chemistry, Prince Sattam Bin Abdul-Aziz University, Saudi Arabia. She did her PhD in Inorganic chemistry in 2004, MSc in Inorganic Chemistry in 1993 and BSc in Chemistry at Mansoura University, Egypt.

E-mail: m.hassan@psau.edu.sa

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