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Euro Green Chemistry 2019
Journal of Industrial and Environmental Chemistry | ISSN: 2591-7331 | Volume 3
CHEMISTRY AND
EURO GREEN CHEMISTRY
9
th
International Conference on
Mai Mostafa A Hassan Shanab et al., J Ind Environ Chem 2019, Volume 3 | DOI: 10.4066/2591-7331-C2-011
SYNTHESIS AND STRUCTURAL STUDIES ON SOME DIOXOMOLYBDENUM (VI)
COMPLEXES BEARING 1-(1-HYDROXYNAPHTHALEN-2-YL) ETHANONE MOIETY
Mai Mostafa A Hassan Shanab
1
, Mohammad S El-Shahawib
2
and
Mohsen MMostafac
3
1
Prince Sattam Bin Abdulaziz University, Saudi Arabia
2
King Abdulaziz University, Saudi Arabia
3
Mansoura University, Egypt
A
number of molybdenum complexes Cis-MoO
2
(NE
)2.CH 3OH, Cis- MoO
2
(HRSB
)2.nH2
O {R= H, 4-Br, 4-OCH
3
,
4-CH
3
and n= 0, 1, 2} Cis- MoO
2
(HL) (acac)nH
2
O {HL= HNEBH, HNEINH, HNENH, HNEPH, n=0,1}, Cis-
[MoO
2
(L
\2.nH2
O], {L\= HNE-2-ABH, HNE-4-ABH, n = 0, 2} and Cis-[MO
2
O
5
(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-MoO
2
(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 (σ) electron affinity (A), global hardness (η) and
electrophilicity index (ω) were calculated.
Mai Mostafa A Hassan Shanab is an Assistant Professor in Department of Inorganic Chemistry, Prince Sattam Bin Abdul-Aziz Uni-
versity, 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.
m.hassan@psau.edu.saBIOGRAPHY
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