Publications

MnO2-CoP3 nanowires array: An efficient electrocatalyst for alkaline oxygen evolution reaction with enhanced activity

Toward designing efficient rice-shaped polyaniline@bismuth oxide nanocomposites for sensor application

Metal-free synthesis of fulleropyrrolidin-2-ols: a novel reaction of [60]fullerene with amines and 2,2-disubstituted acetaldehydes

A series of scarce fulleropyrrolidin-2-ols were synthesized by the facile one-step reaction of [60] fullerene with inexpensive and readily accessible amines and 2,2-disubstituted acetaldehydes without the addition of valuable metal salts in moderate yields, comparable to those for most monoadducts reported previously. This strategy exhibits a broad substrate scope and excellent functional group tolerance. A plausible reaction pathway for the formation of fulleropyrrolidin-2-ols is proposed to elucidate the above reaction process.

Homopolymerization of 3-aminobenzoic acid for enzyme-free electrocatalytic assay of nitrite ions

We describe non-enzymatic novel detection of nitrite ions in various matrices on the surface of poly-3-aminobenzoic acid.

Preparation of CuO mesocrystals via antlerite intermediate for photocatalytic applications

CuO mesocrystals were synthesized by thermal decomposition of antlerite (Cu 3 (OH) 4 SO 4 ) formed as an intermediate by the reaction between CuSO 4 .5H 2 O and urea under specific experimental conditions. Antlerite possessing spindles of sea urchin‐like morphology was obtained via controlled hydrolysis process using ethylene glycol as a co‐solvent. Antlerite and CuO mesocrystals were characterized by X‐ray diffraction (XRD), fourier transform‐infrared spectrum (FT‐IR), thermo gravimetric analysis (TGA), field emission scanning electron microscopy (FESEM) and energy dispersive spectroscopy (EDS). A probable mechanism for formation of such morphologies has been proposed. The photocatalytic and optical properties of CuO mesocrystals were also evaluated.

Fabrication of Sb³⁺sensor based on 1,1′-(-(naphthalene-2,3-diylbis(azanylylidene))bis(methanylylidene))bis(naphthalen-2-ol)/nafion/glassy carbon electrode assembly by electrochemical approach

A new Schiff base named 1,1'-(-(naphthalene-2,3-diylbis(azanylylidene))bis (methanylylidene))bis(naphthalen-2-ol) (NDNA) derived from 2,3-naphthalenediamine and 2-hydroxy-1-naphthaldehyde was synthesized by condensation reaction and then characterized by spectroscopic techniques for structure elucidation. In addition to spectroscopic techniques, the molecular structure of NDNA was clearly confirmed by single-crystal X-ray diffraction study. A thin film of NDNA was fabricated onto glassy carbon electrode (GCE) using 5.0% ethanolic nafion solution as a conducting binder in order to develop the cationic electrochemical sensor (NDNA/nafion/GCE) for the sensing of heavy-metal cations in aqueous systems by electrochemical technique. This newly designed sensor exhibited higher sensitivity and selectivity towards antimony (Sb³⁺) in the presence of other interfering heavy metal cations, as well as long-term stability. Fascinating analytical parameters such as limit of detection (LOD = 0.075 nM, SNR of 3), limit of quantification (LOQ = 0.25 nM) and sensitivity (12.658 × 10^-4 μA μM^-1 cm^-2) were calculated from the calibration curve plot, which shows a linear dynamic range (LDR) of Sb³⁺ ion concentration from 0.1-10.0 mM. This work presents a new approach towards the development of sensitive, efficient as well as selective toxic cationic electrochemical sensors in the environmental and healthcare fields. Hence, this newly designed NDNA/nafion/GCE presents cost-effective and efficient outcomes and can be used as a practical substitute for the efficient detection and removal of Sb³⁺ ions from water samples.

4-Methyl-2-(2-nitrobenzenesulfonamido)pentanoic acid

In the title compound, C(12)H(16)N(2)O(6)S, the S atom adopts a distorted tetra-hedral geometry with an O-S-O angle of 119.76 (13)°. The nitro group is twisted by 35.34 (2)° with respect to the aromatic ring; it accepts an N-H⋯O hydrogen bond, resulting in a S(7) motif. In the crystal, N-H⋯O and O-H⋯O hydrogen bonds connect the mol-ecules into an infinite chain along the a axis. The methyl C atoms of the isopropyl group are disordered in a 1:1 ratio.

Creative Accounting Incentives and Techniques in Saudi Public Companies: A Survey Study

Creative accounting refers to accounts manipulation practices that are used to conceal the true performance of a company by using the flexibility and discretion available in accounting standards and principles without crossing the boundaries of GAAP. It has been believed that companies tend to practice creative accounting techniques to acquire personal or organizational benefits. These practices are considered to be a serious threat to market participants' confidence in published financial statements. Moreover, some researchers believe that creative accounting has an important role in most of last decade's financial scandals, which led to the profession's failure in reaching its expected level. This study was motivated by the results of (Asiri, 2002). It aimed to expand and update the main findings of that study, namely that Saudi public companies practice creative accounting in preparing financial statements. The objective of this study is to determine creative accounting incentives and techniques in Saudi public companies from the academics and practitioners perspectives. It also examines their opinion about the extent to which those techniques comply with GAAP. Depending on statistical methods, this study finds that there are at least ten incentives for Saudi public companies to practice creative accounting. It also concludes that Saudi public companies do practice creative accounting techniques in the area of classification, timing, disclosure and estimation. And that most of these techniques do not comply with GAAP. Finally, the study shows that there are significant differences between academics' opinions in creative accounting and that of practitioners' by 60% for incentives and 47% for techniques.

ZnFe2O4/ZnO nanosheets assembled microspheres for high performance trimethylamine gas sensing

A study on the electronic and charge transfer properties in tin phthalocyanine (SnPc) derivatives by density functional theory

CCDC 2100436: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Electrocatalytic Oxidation of 4‐Aminophenol Molecules at the Surface of an FeS₂/Carbon Nanotube Modified Glassy Carbon Electrode in Aqueous Medium

FeS₂ /carbon nanotube (CNT) nanocomposites were synthesized and immobilized on the surface of a glassy carbon electrode (GCE) in order to investigate the electrocatalytic conversion of 4-aminophenol (4-AP) into p-quinone in an aqueous medium. The reformed electronic properties (in terms of lowering of band-gap energy and charge-transfer resistance), as well as improved surface area, result in an enhanced redox reaction of 4-AP in the presence of FeS₂ -CNT NCs compared to that with FeS₂ alone. The 4-AP molecules undergo coupled two-proton and two-electron transfer quasi-reversible redox reactions with a symmetry factor of 0.55 and standard rate constant (k°) of 0.8 cm s^-1 . Here, quinone imine is generated as an intermediate which is later converted into quinone in an irreversible hydrolysis reaction. The best catalytic performance can be obtained at the pH value of 7.0.

Nanographene composite ion exchanger properties and applications

CCDC 1890941: Experimental Crystal Structure Determination

Novel ionic polymers encompassing di-cationic pyridinium hydrazones and aromatic ester as potent antimicrobial agents against resistant bacteria

Effect of cobalt-doped iron oxide as an electrocatalyst for water splitting and photocatalytic hydrogen evolution

2-Imino-3-(2-nitrophenyl)-1,3-thiazolidin-4-one

In the title compound, C(9)H(7)N(3)O(3)S, the nitro and thia-zolidinone moieties are inclined with respect to the aromatic ring at dihedral angles of 9.57 (16) and 78.42 (4)°, respectively. In the crystal, N-H⋯O hydrogen bonding connects the mol-ecules along the c and a axes to form a two-dimensional polymeric network. A weak S⋯O inter-action [3.2443 (11) Å] and phenyl ring to phenyl ring off-set π⋯π stacking [with centroid-centroid separation of 3.6890 (7) Å and ring slippage of 1.479 Å] link the polymeric chains along the b and a axes, respectively.

2-Amino-4-(3,4-dimethoxyphenyl)-5,6-dihydrobenzo[<i>h</i>]quinoline-3-carbonitrile–3-amino-1-(3,4-dimethoxyphenyl)-9,10-dihydrophenanthrene-2,4-dicarbonitrile (1/19)

The asymmetric unit of the 1:19 title co-crystal of 2-amino-4-(3,4-dimeth-oxy-phen-yl)-5,6-dihydro-benzo[h]quinoline-3-carbo-nitrile and 3-amino-1-(3,4-dimeth-oxy-phen-yl)-9,10-dihydro-phenanthrene-2,4-dicarbonitrile, 0.05C(22)H(19)N(3)O(2)·0.95C(24)H(19)N(3)O(2), has the atoms of the fused-ring system and those of the amino, cyano and dimeth-oxy-phenyl substitutents overlapped. The fused-ring system is buckled owing to the ethyl-ene linkage in the central ring with the two flanking aromatic rings being twisted by 31.9 (1)°. The ring of the dimeth-oxy-phenyl substituent is twisted by 72.4 (1)° relative to the amino- and cyano-bearing aromatic ring. In the crystal, mol-ecules are linked by duplex amine N-H⋯O(meth-oxy) hydrogen bonds in a cyclic association [graph-set R(2) (2)(7)], generating a helical chain structure extending along [201].