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T.H. Rakha

Bio: T.H. Rakha is an academic researcher from Mansoura University. The author has contributed to research in topics: Ligand & Denticity. The author has an hindex of 13, co-authored 23 publications receiving 389 citations.

Papers
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Journal ArticleDOI
TL;DR: In vitro antibacterial studies of the complexes proved them as growth inhibiting agents and the investigation revealed that H2IPH acts as binegative tetradentate in Zn(II), neutral tridentate in Cd( II) and as neutral bidentate towards Hg(II) complex.

72 citations

Journal ArticleDOI
TL;DR: In this article, an octahedral geometry for all complexes except [Cu 2 (H 2 OI)(OAc) 4 ](H2 O) 2 and [Cu(HOI)Cl]-Cl] have been determined for each thermal degradation stage of some studied complexes using Coats-Redfern and Horowitz-Metzger methods.

54 citations

Journal ArticleDOI
TL;DR: The bond length, bond angle, HOMO, LUMO and dipole moment had been calculated to confirm the geometry of the ligands and their investigated complexes and revealed that all complexes possess octahedral geometry except the copper complexes possesses a square planar geometry.

45 citations

Journal ArticleDOI
TL;DR: In this paper, a six coordinated octahedral geometry is assigned for all the picolinohydrazide derivatives, including Co(II, Ni(II) and Cu(II), in terms of magnetic moment and spectral properties.

41 citations

Journal ArticleDOI
T.H. Rakha1
TL;DR: In this article, the Iigand field parameters (B, Dq, β) for the Fe(III), Co(II), Ni(II) and Ag(I) complexes were calculated and related to the electronic environments.
Abstract: Mononuclear and polynuclear chelates of nicotinoyldithiocarbazate (HNDC−) with Fe(III), Mn(II), Fe(II), Co(II), Ni(II), Zn(II), Cd(II), Hg(II), Pd(II), Cu(I) and Ag(I) have been prepared. The chelates have been characterized by chemical and thermal (TG, DTG, DTA) analyses, molar conductivity, spectral (UV-Visible, IR, NMR) and magnetic susceptibility measurements. The molar conductivities of the complexes lie in the non-electrolyte range whilst KHNDC is a 1:1 electrolyte. The IR spectral data show that KHNDC behaves in a monoanionic bidentate or tetradentate and dianionic tetradentate manner. The Iigand field parameters (B, Dq, β) for the Fe(III), Co(II) and Ni(II) complexes were calculated and related to the electronic environments. The solid metal acetate complexes have a unique decomposition exotherm profile which can be used as a rapid and sensitive tool for the detection of acetate-containing complexes.

28 citations


Cited by
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Journal ArticleDOI
TL;DR: Bacterial activity of acyl-hydrazone and its complexes were studied against gram-positive bacteria: Staphylococcus aureus, Bacillus subtilis and gram-negative bacteria: Pseudomonas aeruginosa, Escherichia coli by using minimum inhibitory concentrations (MICs) method.

205 citations

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TL;DR: In this paper, Fourier transform infrared spectroscopy (FTIR) has been widely used as a fast and accurate tool for detecting and analyzing organic materials for several decades since it was initially introduced to study the asphalt material.

170 citations

Journal ArticleDOI
TL;DR: The gas‐phase‐optimized geometry of newly synthesized and characterized diorganotin(IV) 2‐chloridophenylacetohydroxamate complexes of composition and the computed vibrational frequencies and 1H NMR chemical shifts have substantiated the molecular structure of complexes.
Abstract: The gas-phase-optimized geometry of newly synthesized and characterized diorganotin(IV) 2-chloridophenylacetohydroxamate complexes of composition [Me2 Sn(HL)2 ] (I) and [n-Bu2 Sn(HL)2 ] (II) (where KHL = potassium 2-chloridophenylacetohydroxamate (2-ClPhAHK); [Me2 Sn(2-ClC6 H4 CH2 CONHO)2 ] (I) and [n-Bu2 Sn(2-ClC6 H4 CH2 CONHO)2 ] (II) computed by B3LYP/6-311++G(d,p) method has shown these to be distorted octahedral. Bonding through carbonyl and hydroxamic oxygen atoms (O, O coordination) has been inferred from a comparison of computed important bond lengths (CO, CN, and NO) of complexes with that of free ligand. The SnO bond lengths in complexes are suggestive of weak coordinate (through carbonyl CO) and strong covalent (through hydroxamic NO) bonding of the ligand. The magnitude of CSnC bond angles involving two methyl/n-butyl groups is suggestive of cis-conformation at tin metal. The thermodynamic parameters (G, H, S, E, Cv, and U) of complexes have been computed. From the energies of frontier molecular orbitals (HOMO-LUMO), the reactivity descriptors, namely, ionization potential, electron affinity, chemical potential (μ), hardness (η), softness (S), electronegativity (χ), and electrophilicity index (ω) have been calculated. The computed vibrational frequencies and 1 H NMR chemical shifts have substantiated the molecular structure of complexes. © 2019 Wiley Periodicals, Inc.

103 citations

Journal ArticleDOI
TL;DR: Schiff base complexes of cobalt, nickel, copper, and zinc with 3-ethoxysalicyliden-p-aminoacetophenoneoxime (HL) were prepared and characterized on the basis of elemental analyses, IR, 1H- and 13C-NMR, electronic spectra, magnetic susceptibility measurements, molar conductivity and thermogravimetric analyses as discussed by the authors.
Abstract: Schiff-base complexes of cobalt(II), nickel(II), copper(II) and, zinc(II) with 3-ethoxysalicyliden-p-aminoacetophenoneoxime (HL) were prepared and characterized on the basis of elemental analyses, IR, 1H- and 13C-NMR, electronic spectra, magnetic susceptibility measurements, molar conductivity and thermogravimetric analyses (TGA). A tetrahedral geometry has been assigned to the complexes.

96 citations

Journal ArticleDOI
TL;DR: In this article, a combined experimental and computational study of novel Mn(II, Ni(II), Cu(II) complexes of (E)-2-((3-hydroxynaphthalen-2-yl)methylene)-N-(pyridin-2yl)hydrazinecarbothioamide (H2L) was presented.

90 citations