1
|
Elshami FI, Shereef HA, El-Mehasseb IM, Shaban SY, van Eldik R. Hydroxychloroquine-Loaded Chitosan Nanoparticles Induce Anticancer Activity in A549 Lung Cancer Cells: Design, BSA Binding, Molecular Docking, Mechanistic, and Biological Evaluation. Int J Mol Sci 2023; 24:14103. [PMID: 37762406 PMCID: PMC10531786 DOI: 10.3390/ijms241814103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 08/29/2023] [Accepted: 08/31/2023] [Indexed: 09/29/2023] Open
Abstract
The current study describes the encapsulation of hydroxychloroquine, widely used in traditional medicine due to its diverse pharmacological and medicinal uses, in chitosan nanoparticles (CNPs). This work aims to combine the HCQ drug with CS NPs to generate a novel nanocomposite with improved characteristics and bioavailability. HCQ@CS NPs are roughly shaped like roadways and have a smooth surface with an average size of 159.3 ± 7.1 nm, a PDI of 0.224 ± 0.101, and a zeta potential of +46.6 ± 0.8 mV. To aid in the development of pharmaceutical systems for use in cancer therapy, the binding mechanism and affinity of the interaction between HCQ and HCQ@CS NPs and BSA were examined using stopped-flow and other spectroscopic approaches, supplemented by molecular docking analysis. HCQ and HCQ@CS NPs binding with BSA is driven by a ground-state complex formation that may be accompanied by a non-radiative energy transfer process, and binding constants indicate that HCQ@CS NPs-BSA was more stable than HCQ-BSA. The stopped-flow analysis demonstrated that, in addition to increasing BSA affinity, the nanoformulation HCQ@CS NPS changes the binding process and may open new routes for interaction. Docking experiments verified the development of the HCQ-BSA complex, with HCQ binding to site I on the BSA structure, primarily with the amino acids, Thr 578, Gln 579, Gln 525, Tyr 400, and Asn 404. Furthermore, the nanoformulation HCQ@CS NPS not only increased cytotoxicity against the A549 lung cancer cell line (IC50 = 28.57 ± 1.72 μg/mL) compared to HCQ (102.21 ± 0.67 μg/mL), but also exhibited higher antibacterial activity against both Gram-positive and Gram-negative bacteria when compared to HCQ and chloramphenicol, which is in agreement with the binding constants. The nanoformulation developed in this study may offer a viable therapy option for A549 lung cancer.
Collapse
Affiliation(s)
- Fawzia I. Elshami
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt; (F.I.E.); (I.M.E.-M.)
| | - Hadeer A. Shereef
- Clinical Pathology Department, University Hospital, Menoufia University, Shebin El-Kom 32512, Egypt;
| | - Ibrahim M. El-Mehasseb
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt; (F.I.E.); (I.M.E.-M.)
| | - Shaban Y. Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt; (F.I.E.); (I.M.E.-M.)
| | - Rudi van Eldik
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
- Faculty of Chemistry, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland
| |
Collapse
|
2
|
Mansour H, Elsigeny SM, Elshami FI, Auf M, Shaban SY, van Eldik R. Microstructure, Physical and Biological Properties, and BSA Binding Investigation of Electrospun Nanofibers Made of Poly(AA-co-ACMO) Copolymer and Polyurethane. Molecules 2023; 28:molecules28093951. [PMID: 37175361 PMCID: PMC10180346 DOI: 10.3390/molecules28093951] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 05/05/2023] [Accepted: 05/06/2023] [Indexed: 05/15/2023] Open
Abstract
In this study, poly(AA-co-ACMO) and polyurethane-based nanofibers were prepared in a ratio of 1:1 (NF11) and 2:1 (NF21) as antimicrobial carriers for chronic wound management. Different techniques were used to characterize the nanofibers, and poly(AA-co-ACMO) was mostly found on the surface of PU. With an increase in poly(AA-co-ACMO) dose from 0 (PU) and 1:1 (NF11) to 2:1 (NF21) in the casting solution, the contact angle (CA) was reduced from 137 and 95 to 24, respectively, and hydrophilicity was significantly increased. As most medications inhibit biological processes by binding to a specific protein, in vitro protein binding was investigated mechanistically using a stopped-flow technique. Both NF11 and NF21 bind to BSA via two reversible steps: a fast second-order binding followed by a slow first-order one. The overall parameters for NF11 (Ka = 1.1 × 104 M-1, Kd = 89.0 × 10-6, ΔG0 = -23.1 kJ mol-1) and NF21 (Ka = 189.0 × 104 M-1, Kd = 5.3 × 10-6 M, ΔG0 = -27.5 kJ mol-1) were determined and showed that the affinity for BSA is approximately (NF11)/(NF21) = 1/180. This indicates that NF21 has much higher BSA affinity than NF11, although BSA interacts with NF11 much faster. NF21 with higher hydrophilicity showed effective antibacterial properties compared to NF11, in agreement with kinetic data. The study provided an approach to manage chronic wounds and treating protein-containing wastewater.
Collapse
Affiliation(s)
- Hanaa Mansour
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Samia M Elsigeny
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Fawzia I Elshami
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Mohamed Auf
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Shaban Y Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Rudi van Eldik
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
- Faculty of Chemistry, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland
| |
Collapse
|
3
|
Shereef HA, Moemen YS, Elshami FI, El-Nahas AM, Shaban SY, van Eldik R. DNA Binding and Cleavage, Stopped-Flow Kinetic, Mechanistic, and Molecular Docking Studies of Cationic Ruthenium(II) Nitrosyl Complexes Containing “NS4” Core. Molecules 2023; 28:molecules28073028. [PMID: 37049792 PMCID: PMC10095794 DOI: 10.3390/molecules28073028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 03/24/2023] [Accepted: 03/24/2023] [Indexed: 03/31/2023] Open
Abstract
This work aimed to evaluate in vitro DNA binding mechanistically of cationic nitrosyl ruthenium complex [RuNOTSP]+ and its ligand (TSPH2) in detail, correlate the findings with cleavage activity, and draw conclusions about the impact of the metal center. Theoretical studies were performed for [RuNOTSP]+, TSPH2, and its anion TSP−2 using DFT/B3LYP theory to calculate optimized energy, binding energy, and chemical reactivity. Since nearly all medications function by attaching to a particular protein or DNA, the in vitro calf thymus DNA (ctDNA) binding studies of [RuNOTSP]+ and TSPH2 with ctDNA were examined mechanistically using a variety of biophysical techniques. Fluorescence experiments showed that both compounds effectively bind to ctDNA through intercalative/electrostatic interactions via the DNA helix’s phosphate backbone. The intrinsic binding constants (Kb), (2.4 ± 0.2) × 105 M−1 ([RuNOTSP]+) and (1.9 ± 0.3) × 105 M−1 (TSPH2), as well as the enhancement dynamic constants (KD), (3.3 ± 0.3) × 104 M−1 ([RuNOTSP]+) and (2.6 ± 0.2) × 104 M−1 (TSPH2), reveal that [RuNOTSP]+ has a greater binding propensity for DNA compared to TSPH2. Stopped-flow investigations showed that both [RuNOTSP]+ and TSPH2 bind through two reversible steps: a fast second-order binding, followed by a slow first-order isomerization reaction via a static quenching mechanism. For the first and second steps of [RuNOTSP]+ and TSPH2, the detailed binding parameters were established. The total binding constants for [RuNOTSP]+ (Ka = 43.7 M−1, Kd = 2.3 × 10−2 M−1, ΔG0 = −36.6 kJ mol−1) and TSPH2 (Ka = 15.1 M−1, Kd = 66 × 10−2 M, ΔG0 = −19 kJ mol−1) revealed that the relative reactivity is approximately ([RuNOTSP]+)/(TSPH2) = 3/1. The significantly negative ΔG0 values are consistent with a spontaneous binding reaction to both [RuNOTSP]+ and TSPH2, with the former being very favorable. The findings showed that the Ru(II) center had an effect on the reaction rate but not on the mechanism and that the cationic [RuNOTSP]+ was a more highly effective DNA binder than the ligand TSPH2 via strong electrostatic interaction with the phosphate end of DNA. Because of its higher DNA binding affinity, cationic [RuNOTSP]+ demonstrated higher cleavage efficiency towards the minor groove of pBR322 DNA via the hydrolytic pathway than TSPH2, revealing the synergy effect of TSPH2 in the form of the complex. Furthermore, the mode of interaction of both compounds with ctDNA has also been supported by molecular docking.
Collapse
Affiliation(s)
- Hadeer A. Shereef
- Chemistry Department, Faculty of Science, Menoufia University, Shebin El-Kom 32512, Egypt
- Clinical Pathology Department, University Hospital, Menoufia University, Shebin El-Kom 32512, Egypt
| | - Yasmine S. Moemen
- Clinical Pathology Department, National Liver Institute, Menoufia University, Shebin El-Kom 32512, Egypt
| | - Fawzia I. Elshami
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Ahmed M. El-Nahas
- Chemistry Department, Faculty of Science, Menoufia University, Shebin El-Kom 32512, Egypt
| | - Shaban Y. Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
- Correspondence: (S.Y.S.); (R.v.E.)
| | - Rudi van Eldik
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
- Faculty of Chemistry, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland
- Correspondence: (S.Y.S.); (R.v.E.)
| |
Collapse
|
4
|
Mohamed HA, Ibrahim MM, El‐Mehasseb IM, Ramadan AEM, Shaban SY. Carboxy‐Thioether‐Thiolato Titanium (IV)‐Graphene Oxide Nanocomposite as Drug Delivery System for Targeted Cancer Therapy: Design, Characterization, BSA Binding Study, and Biological Evaluation. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.7009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Hanan A. Mohamed
- Chemistry Department, Faculty of Science Kafrelsheikh University 33516 Kafrelsheikh Egypt
| | - Mohamed M. Ibrahim
- Chemistry Department, College of Science Taif University Taif 21944 Saudi Arabia
| | - Ibrahim M. El‐Mehasseb
- Chemistry Department, Faculty of Science Kafrelsheikh University 33516 Kafrelsheikh Egypt
| | | | - Shaban Y. Shaban
- Chemistry Department, Faculty of Science Kafrelsheikh University 33516 Kafrelsheikh Egypt
| |
Collapse
|
5
|
Ibrahim MM, Shaban SY, Amer AA, Mohamed SF, Fathy AM, Al-Harbi SA, Ramadan AEMM. Tuning the structural and catalytic properties of copper(II)-based complexes containing pyridine-2,6-diimines. J Biomol Struct Dyn 2022; 40:10677-10695. [PMID: 34435546 DOI: 10.1080/07391102.2021.1947379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Four mononuclear penta coordinated copper(II) chelates, [CuLnBr2] nH2O, containing the tridentate neutral ligands, pyridine-2,6-diimine (Ln), were prepared via the template technique. Analytical and several physicochemical methods have been used to characterize the prepared metal chelates. Square-pyramidal stereochemistry was described to the current copper(II) complexes. DFT technique has been applied to optimize the structure of the running diimines and their corresponding copper-based compounds. Ligand substitution study performed to link the catalytic potency of the candidate oxidase mimics and their lability characters. Spectral investigations reveal that nature of substituents of the chelated ligands effectively tuning the Lewis acidity of copper(II) centers. Biomimetics of redox proteins specifically containing copper were examined towards the aerobic oxidation of polyphenol. Kinetic studies with the stopped-follow technique showed a close association between the Lewis acidity of the copper(II) nuclei of the prepared chelates and their oxidase-like activity. The catalytic activity of the natural enzyme (catechol oxidase from sweet potatoes) measured and compared with that for the present CuII chelates. The thermodynamic parameter drive force (ΔG° or λ) of the performed oxidation processes was determined from the values of redox potential of the chemical species involved in these catalytic reactions. The proposed catalytic reactions pathways have been discussed based on the outcomes of the kinetic investigations.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Mohamed M Ibrahim
- Chemistry Department, College of Science, Taif University, Saudi Arabia
| | - Shaban Y Shaban
- Chemistry Department, Faculty of Science, Kafr El-Sheikh University, Kafr El-Sheikh, Egypt
| | - Ahmed A Amer
- Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt
| | - Soha F Mohamed
- Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt
| | - Ahmed M Fathy
- Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt
| | - Sami A Al-Harbi
- Chemistry Department, University College in Al-Jamoum, Umm Al-Qura University, Makkah, Saudi Arabia
| | | |
Collapse
|
6
|
Ramzy E, Ibrahim MM, El-Mehasseb IM, Ramadan AEMM, Elshami FI, Shaban SY, van Eldik R. Synthesis, Biophysical Interaction of DNA/BSA, Equilibrium and Stopped-Flow Kinetic Studies, and Biological Evaluation of bis(2-Picolyl)amine-Based Nickel(II) Complex. Biomimetics (Basel) 2022; 7:172. [PMID: 36412701 PMCID: PMC9680484 DOI: 10.3390/biomimetics7040172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/17/2022] [Accepted: 10/19/2022] [Indexed: 12/14/2022] Open
Abstract
Reaction of bis(2-picolyl)amine (BPA) with Ni(II) salt yielded [(BPA)NiCl2(H2O)] (NiBPA). The Ni(II) in NiBPA bound to a BPA ligand, two chloride, and one aqua ligands. Because most medications inhibit biological processes by binding to a specific protein, the stopped-flow technique was used to investigate DNA/protein binding in-vitro, and a mechanism was proposed. NiBPA binds to DNA/protein more strongly than BPA via a static quenching mechanism. Using the stopped-flow technique, a mechanism was proposed. BSA interacts with BPA via a fast reversible step followed by a slow irreversible step, whereas NiBPA interacts via two reversible steps. DNA, on the other hand, binds to BPA and NiBPA via the same mechanism through two reversible steps. Although BSA interacts with NiBPA much faster, NiBPA has a much higher affinity for DNA (2077 M) than BSA (30.3 M). Compared to NiBPA, BPA was found to form a more stable BSA complex. When BPA and NiBPA bind to DNA, the Ni(II) center was found to influence the rate but not the mechanism, whereas, for BSA, the Ni(II) center was found to change both the mechanism and the rate. Additionally, NiBPA exhibited significant cytotoxicity and antibacterial activity, which is consistent with the binding constants but not the kinetic stability. This shows that in our situation, biological activity is significantly more influenced by binding constants than by kinetic stability. Due to its selectivity and cytotoxic activity, complex NiBPA is anticipated to be used in medicine.
Collapse
Affiliation(s)
- Esraa Ramzy
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Mohamed M. Ibrahim
- Chemistry Department, Faculty of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Ibrahim M. El-Mehasseb
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | | | - Fawzia I. Elshami
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Shaban Y. Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt
| | - Rudi van Eldik
- Chemistry Department, Faculty of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, 91058 Erlangen, Germany
- Faculty of Chemistry, Nicolaus Copernicus University in Torun, 87-100 Torun, Poland
| |
Collapse
|
7
|
Shaban NZ, Aboelsaad AM, Awad D, Abdulmalek SA, Shaban SY. Therapeutic effect of dithiophenolato chitosan nanocomposites against carbon tetrachloride-induced hepatotoxicity in rats. Environ Sci Pollut Res Int 2022; 29:8487-8502. [PMID: 34487322 DOI: 10.1007/s11356-021-15834-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 08/02/2021] [Indexed: 06/13/2023]
Abstract
Our previous study showed that dithiophenolate (DTP) and its chitosan nanoparticles (DTP-CSNPs) have abilities to bind with DNA helixes. So in this study, their lethal doses (LD50) and therapeutic roles against rat liver injuries induced by carbon tetrachloride (CCl4) were evaluated. The study focused on the determination of the markers of oxidative stress (OS) and apoptosis and compare the results with those of cisplatin treatment. The results revealed that LD50 values of DTP and DTP-CSNPs are 2187.5 and 1462.5 mg/kg, respectively. Treatment with DPT and DPT-CSNPs after CCl4 administration reduced liver injuries, induced by CCl4, and improved liver functions and architecture through the reduction of OS and apoptosis. Where the oxidant marker was decreased with elevations of antioxidant markers. Also, there was an elevation in Bcl-2 value, with decreases in caspase-8, Bax, and Bax/Bcl-2 ratio. DPT-CSNPs treatment gave preferable results than those treated with DPT. Moreover, DTP and DPT-CSNPs treatment gave better results than cisplatin treatment. The administration of healthy rats with low doses of DTP and DTP-CSNPs for 14 days had no effect. Otherwise, the study on HepG2 cell line showed that DTP and DPT-CSNPs inhibited cell growth by arresting cells in the G2/M phase and inducing cell death. In conclusion, DTP and DTP-CSNPs have antiapoptotic and anti-oxidative stress toward hepatotoxicity induced by CCl4. Moreover, DTP and DTP-CSNPs have anticancer activity against the HepG2 cell line. Generally, DTP-CSNPs are more effective than DTP. So, they can be used in the pharmacological fields, especially DTP-CSNPs.
Collapse
Affiliation(s)
- Nadia Z Shaban
- Biochemistry Department, Faculty of Science, Alexandria University, Alexandria, 21511, Egypt.
| | - Ahmed M Aboelsaad
- Biochemistry Department, Faculty of Science, Alexandria University, Alexandria, 21511, Egypt
| | - Doaa Awad
- Biochemistry Department, Faculty of Science, Alexandria University, Alexandria, 21511, Egypt
| | - Shaymaa A Abdulmalek
- Biochemistry Department, Faculty of Science, Alexandria University, Alexandria, 21511, Egypt
| | - Shaban Y Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt
| |
Collapse
|
8
|
Shaban NZ, Yehia SA, Awad D, Shaban SY, Saleh SR. A Titanium (IV)-Dithiophenolate Complex and Its Chitosan Nanocomposite: Their Roles towards Rat Liver Injuries In Vivo and against Human Liver Cancer Cell Lines. Int J Mol Sci 2021; 22:ijms222011219. [PMID: 34681878 PMCID: PMC8540501 DOI: 10.3390/ijms222011219] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 10/09/2021] [Accepted: 10/11/2021] [Indexed: 01/01/2023] Open
Abstract
Titanium (IV)–dithiophenolate complex chitosan nanocomposites (DBT–CSNPs) are featured by their antibacterial activities, cytotoxicity, and capacity to bind with DNA helixes. In this study, their therapeutic effects against rat liver damage induced by carbon tetrachloride (CCl4) and their anti-proliferative activity against human liver cancer (HepG2) cell lines were determined. Results of treatment were compared with cisplatin treatment. Markers of apoptosis, oxidative stress, liver functions, and liver histopathology were determined. The results showed that DBT–CSNPs and DBT treatments abolished liver damage induced by CCl4 and improved liver architecture and functions. DNA fragmentation, Bax, and caspase-8 were reduced, but Bcl-2 and the Bcl-2/Bax ratios were increased. However, there was a non-significant change in the oxidative stress markers. DBT–CSNPs and DBT inhibited the proliferation of HepG2 cells by arresting cells in the G2/M phase and inducing cell death. DBT–CSNPs were more efficient than DBT. Low doses of DBT and DBT–CSNPs applied to healthy rats for 14 days had no adverse effect. DBT and DBT–CSNP treatment gave preferable results than the treatment with cisplatin. In conclusion, DBT–CSNPs and DBT have anti-apoptotic activities against liver injuries and have anti-neoplastic impacts. DBT–CSNPs are more efficient. Both compounds can be used in pharmacological fields.
Collapse
Affiliation(s)
- Nadia Z. Shaban
- Biochemistry Department, Faculty of Science, Alexandria University, Alexandria 21515, Egypt; (S.A.Y.); (D.A.); (S.R.S.)
- Correspondence: ; Tel.: +20-1227425785; Fax: +2-(03)-3911794
| | - Salah A. Yehia
- Biochemistry Department, Faculty of Science, Alexandria University, Alexandria 21515, Egypt; (S.A.Y.); (D.A.); (S.R.S.)
| | - Doaa Awad
- Biochemistry Department, Faculty of Science, Alexandria University, Alexandria 21515, Egypt; (S.A.Y.); (D.A.); (S.R.S.)
| | - Shaban Y. Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt;
| | - Samar R. Saleh
- Biochemistry Department, Faculty of Science, Alexandria University, Alexandria 21515, Egypt; (S.A.Y.); (D.A.); (S.R.S.)
| |
Collapse
|
9
|
Sallam G, Shaban SY, Nassar A, El-Khouly ME. Water soluble porphyrin as optical sensor for the toxic heavy metal ions in an aqueous medium. Spectrochim Acta A Mol Biomol Spectrosc 2020; 241:118609. [PMID: 32619970 DOI: 10.1016/j.saa.2020.118609] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 04/28/2020] [Accepted: 06/10/2020] [Indexed: 06/11/2023]
Abstract
Here we report the photophysical and sensing properties of the aqueous solution of meso-tetra(N-methyl-4-pyridyl)porphyrin toluene sulfonate (TMPP) for simultaneous detection of toxic metal ions in an aqueous medium by using different physiochemical methods such as UV-vis absorption, steady state and time resolved fluorescence, stopped flow, and cyclic voltammetry. The steady-state absorption and fluorescence spectra in organic solvents (EtOH, DMSO, DMF, MeOH and ACN) showed the formation of monomer form (λmaxabs = 426 nm and λmaxflu = 654 and 715 nm). In THF and water, different spectral features were recorded suggested the formation of aggregated forms in both solvents. The formation of aggregated form in water was confirmed by recording the remarkable fluorescence quenching of the singlet excited TMPP with increasing the concentrations of TMPP. In cationic micelles (CTAB), both the absorption and fluorescence spectra were significantly decreased with increasing the concentrations of CTAB with a break at CMC value at 6.0 × 10-5 M. In an anionic micelle (SDS), the CMC value was found to be 1.0 × 10-4 M. Upon interacting with different metal ions, the absorption and fluorescence spectra of TMPP showed different features depending on the metal ions. While the optical studies of TMPP showed no significant interaction in the presence of Mn+2, Co+2, Ba2+, and Ni+2, TMPP showed that it can function as a single optical chemical sensor for the toxic metal ions in water, particularly Hg+2, Pb+2, Cu+2, and Cd+2 ions.
Collapse
Affiliation(s)
- Gehan Sallam
- Department of Chemistry, Faculty of Science, Kafrelsheikh University, Kafr El-Sheikh 33516, Egypt
| | - Shaban Y Shaban
- Department of Chemistry, Faculty of Science, Kafrelsheikh University, Kafr El-Sheikh 33516, Egypt
| | - Aly Nassar
- Department of Chemistry, Faculty of Science, Kafrelsheikh University, Kafr El-Sheikh 33516, Egypt
| | - Mohamed E El-Khouly
- Department of Chemistry, Faculty of Science, Kafrelsheikh University, Kafr El-Sheikh 33516, Egypt; Institute of Basic and Applied Sciences, Egypt-Japan University of Science and Technology, New Borg El-Arab, Alexandria, Egypt.
| |
Collapse
|
10
|
Shaban NZ, Aboelsaad AM, Shoueir KR, Abdulmalek SA, Awad D, Shaban SY, Mansour H. Chitosan-based dithiophenolato nanoparticles: Preparation, mechanistic information of DNA binding, antibacterial and cytotoxic activities. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114252] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
11
|
Ramadan AEM, Shaban SY, Ibrahim MM, Eissa H, Al‐Saidi HM, Fathy AM. Catechol oxidase and phenoxazinone synthase mimicking activity, X‐ray diffraction and density function theory study of pyridine and phenolate‐based manganese(II) and iron(III) complexes: Synthesis and spectroscopic characterization. J CHIN CHEM SOC-TAIP 2020. [DOI: 10.1002/jccs.201900383] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
| | - Shaban Y. Shaban
- Chemistry Department, Faculty of ScienceKafr El‐Sheikh University Egypt
| | - Mohamed M. Ibrahim
- Chemistry Department, Faculty of ScienceKafr El‐Sheikh University Egypt
- Chemistry Department, Faculty of ScienceTaif University Taif Saudi Arabia
| | - Hatem Eissa
- Chemistry Department, Faculty of ScienceKafr El‐Sheikh University Egypt
| | - Hamed M. Al‐Saidi
- Chemistry Department, University College in Al‐JamoumUmm Al‐Qura University Makkah Saudi Arabia
| | - Ahmad M. Fathy
- Chemistry Department, Faculty of ScienceZagazig University Zagazig Egypt
| |
Collapse
|
12
|
El-Shamy H, Shaban SY, El-Mehasseb I, El-Kemary M, van Eldik R. Probing the interaction of iron complex containing N 3S 2 macrocyclic ligand with bovine serum albumin using spectroscopic techniques. Spectrochim Acta A Mol Biomol Spectrosc 2020; 228:117811. [PMID: 31813731 DOI: 10.1016/j.saa.2019.117811] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Revised: 11/16/2019] [Accepted: 11/17/2019] [Indexed: 06/10/2023]
Abstract
The interaction of bovine serum albumin (BSA) with seven-coordination iron (II) complex containing sulfur-based macrocyclic ligand was investigated by means of UV/vis absorption spectroscopy and fluorescence quenching technique. The accurate fluorescence spectra are obtained by using Inner filter effect (IFE) correction. The apparent association constant, kapp, the number of binding sites, n, and the apparent binding constant KSV were found to be 0.95 × 103 M-1, 0.96, and 6.13 × 104 M-1, respectively. It found that BSA molecules are adsorbed on the surface of iron (II) complex by electrostatic interaction. The quenching mechanism is discussed involving energy transfer from BSA to iron (II) complex.
Collapse
Affiliation(s)
- Hany El-Shamy
- Chemistry Department, El Shaheed Ezzat El Shafei Secondary School for Girls, Kafrelsheikh, Egypt.
| | - Shaban Y Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, 33516 Kafrelsheikh, Egypt
| | - Ibrahim El-Mehasseb
- Chemistry Department, Faculty of Science, Kafrelsheikh University, 33516 Kafrelsheikh, Egypt
| | - Maged El-Kemary
- Chemistry Department, Nano Science and Technology Institute, Kafrelsheikh University, 33516 Kafrelsheikh, Egypt
| | - Rudi van Eldik
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Egerlandstr. 1, 91058 Erlangen, Germany
| |
Collapse
|
13
|
Soliman E, EL-Khouly M, Ramadan AEMM, EL-Mehasseb I, Shaban SY. Energy-transfer versus electron-transfer reactions for the light-harvesting phthalocyanine/ dithiolato-bisimino zinc system. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1743277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Eman Soliman
- Faculty of Science, Department of Chemistry, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Mohamed EL-Khouly
- Faculty of Science, Department of Chemistry, Kafrelsheikh University, Kafrelsheikh, Egypt
- Institute of Basic and Applied Sciences, Egypt-Japan University of Science and Technology (E-JUST), Alexandria, Egypt
| | | | - Ibrahim EL-Mehasseb
- Faculty of Science, Department of Chemistry, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Shaban Y. Shaban
- Faculty of Science, Department of Chemistry, Kafrelsheikh University, Kafrelsheikh, Egypt
| |
Collapse
|
14
|
Elshami FI, Ramadan AEM, Ibrahim MM, El‐Mehasseb IM, Al‐Juaid S, Shaban SY. Metformin Containing Nickel (II) Complexes: Synthesis, Structural Characterization, Binding and Kinetic Interactions with BSA, Antibacterial and in‐vitro Cytotoxicity Studies. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5437] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Fawzya I. Elshami
- Department of Chemistry, Faculty of Science, KafrelsheikhUniversity Kafrelsheikh 33516 Egypt
| | | | - Mohamed M. Ibrahim
- Department of Chemistry, Faculty of Science, KafrelsheikhUniversity Kafrelsheikh 33516 Egypt
- Department of Chemistry, Faculty of ScienceTaif University Taif Saudi Arabia
| | - Ibrahim M. El‐Mehasseb
- Department of Chemistry, Faculty of Science, KafrelsheikhUniversity Kafrelsheikh 33516 Egypt
| | - Salih Al‐Juaid
- Department of Chemistry, Faculty of ScienceKing Abdulaziz University Jeddah Saudi Arabia
| | - Shaban Y. Shaban
- Department of Chemistry, Faculty of Science, KafrelsheikhUniversity Kafrelsheikh 33516 Egypt
| |
Collapse
|
15
|
Ramadan AEMM, Shaban SY, Ibrahim MM, Abdel-Rahman AAH, Sallam SA, Al-Harbi SA, Omar W. Synthesis and spectroscopic characterization of ternary copper(ii) complexes containing nitrogen and oxygen donors as functional mimics of catechol oxidase and phenoxazinone synthase. NEW J CHEM 2020. [DOI: 10.1039/c9nj06131b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Two ternary copper(ii) complexes 1 [(Cu2Me4en)4(EDTA)] and 2 [(CuMe4en)2(MIDA)] containing the mixed ligand system of 1,1′,4,4′-tetramethylethylenediamine (Me4en) (L) and N-methyliminodiacetic (MIDAH2) (L′) or ethylenediaminetetraacetic acid (EDTAH4) (L′) were synthesized.
Collapse
Affiliation(s)
| | - Shaban Y. Shaban
- Department of Chemistry
- Faculty of Science
- Kafr El-Sheikh University
- Kafr El-Sheikh
- Egypt
| | - Mohamed M. Ibrahim
- Department of Chemistry
- Faculty of Science
- Kafr El-Sheikh University
- Kafr El-Sheikh
- Egypt
| | | | - Shehab A. Sallam
- Department of Chemistry
- Faculty of Science
- Suez Canal University
- Ismailia
- Egypt
| | - Sami A. Al-Harbi
- Department of Chemistry
- University College in Al-Jamoum
- Umm Al-Qura University
- Makkah
- Saudi Arabia
| | - Walid Omar
- Department of Chemistry
- Faculty of Science
- Kafr El-Sheikh University
- Kafr El-Sheikh
- Egypt
| |
Collapse
|
16
|
Ramadan AEM, Shaban SY, Ibrahim MM, El‐Hendawy MM, Eissa H, Al‐Harbi SA. Copper(II) complexes containing pyridine‐based and phenolate‐based systems: Synthesis, characterization, DFT study, biomimetic catalytic activity of catechol oxidase and phenoxazinone synthase. J CHIN CHEM SOC-TAIP 2019. [DOI: 10.1002/jccs.201900113] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - Shaban Y. Shaban
- Chemistry Department, Faculty of ScienceKafr El‐Sheikh University Kafr El‐Sheikh Egypt
| | - Mohammed M. Ibrahim
- Chemistry Department, Faculty of ScienceKafr El‐Sheikh University Kafr El‐Sheikh Egypt
- Chemistry Department, Faculty of ScienceTaif University Taif Saudi Arabia
| | | | - Hatem Eissa
- Chemistry Department, Faculty of ScienceKafr El‐Sheikh University Kafr El‐Sheikh Egypt
| | - Sami A. Al‐Harbi
- Chemistry DepartmentUniversity College in Al‐Jamoum, Umm Al‐Qura University Makkah Saudi Arabia
| |
Collapse
|
17
|
Shaban SY, Ramadan AEMM, Ibrahim MM, Elshami FI, van Eldik R. Square planar versus square pyramidal copper(II) complexes containing N3O moiety: Synthesis, structural characterization, kinetic and catalytic mimicking activity. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.11.024] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
18
|
El-Khouly ME, El-Refaey A, Shaban SY, El-Hendawy MM. Intramolecular electron transfer of light harvesting perylene-pyrene supramolecular conjugate. Photochem Photobiol Sci 2018; 17:1098-1107. [PMID: 29993078 DOI: 10.1039/c8pp00134k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Electronic interactions between the cationic N,N'-bis(2(trimethylammonium iodide) ethylene)perylene-3,4,9,10-tetracarboxyldiimide (TAIPDI) with two electron donors, namely, pyrene (Py) and 1-pyrenesulfonic acid sodium salt (PySA), have been investigated. The spectroscopic studies showed the formation of the supramolecular conjugate between TAIPDI and PySA via ionic interaction, but not with Py. Density functional theory (DFT) combined with a natural energy decomposition analysis (NEDA) technique showed an S-like structure of the supramolecular conjugate TAIPDI-PySA via an ionic interaction. The formation constant of the TAIPDI-PySA supramolecular conjugate was determined to be 3.0 × 104 M-1, suggesting a fairly stable complex formation. The excited state events were monitored by both steady state and time-resolved emission techniques. Upon excitation, the quenching pathways via the singlet-excited states of TAIPDI and PySA involved the intramolecular electron transfer from the electron donating PySA to the electron accepting TAIPDI with a rate constant of 1.10 × 1011 s-1 and a quantum yield of 0.99. The thermodynamic parameters of the supramolecular TAIPDI-PySA conjugate have been determined using the stopped-flow technique.
Collapse
Affiliation(s)
- Mohamed E El-Khouly
- Department of Chemistry, Faculty of Science, Kafrelsheikh University, Kaf El-Sheikh 33516, Egypt.
| | | | | | | |
Collapse
|
19
|
El-Refaey A, Shaban SY, El-Kemary M, El-Khouly ME. A light harvesting perylene derivative - zinc phthalocyanine complex in water: spectroscopic and thermodynamic studies. Photochem Photobiol Sci 2018; 16:861-869. [PMID: 28379265 DOI: 10.1039/c7pp00055c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A perylene derivative, namely N,N'-bis(2(trimethylammonium iodide)ethylene)perylene-3,4,9,10-tetracarboxyldiimide (TAIPDI) forms nanoscale columnar stacks in water that have been characterized by using optical absorption and emission measurements, dynamic light scattering (DLS), and transmission electron microscopy (TEM). This behaviour was compared with that of unstacked TAIPDI in methanol. Assembly formation between the one-dimensional TAIPDI stacks and zinc phthalocyanine tetrasulphonic groups (ZnPcS4) via strong π-π and ionic interactions has been described in an aqueous medium. The formation constant of the supramolecular dyad has been determined as 2.94 × 104 M-1 from both the absorption and fluorescence measurements. Upon addition of ZnPcS4, the fluorescence quenching of the singlet-excited state of TAIPDI was observed because of the electron transfer process from ZnPcS4 to TAIPDI via the singlet-excited states of ZnPcS4 and TAIPDI entities. The electrochemical studies supported the electron transfer pathways via the singlet states of ZnPcS4 and TAIPDI. The thermodynamic parameters of the supramolecular complex have been determined from stopped-flow measurements. The interaction between ZnPcS4 and TAIPDI occurs in two steps, where the rate constant of the second step with TAIPDI (207 ± 8 M-1 s-1) is much slower than the first one (3515 ± 101 M-1 s-1). Activation parameters for the complex formation (ΔH# = 76 ± 11 kJ mol-1 and ΔS# = 83 ± 37 J K-1 mol-1, and ΔH# = 221 ± 15 kJ mol-1 and ΔS# = 540 ± 50 J K-1 mol-1) were determined from variable temperature studies for the first and second steps, respectively. The significantly positive ΔS# values found for both steps of the interaction reactions are consistent with a dissociative mechanism.
Collapse
Affiliation(s)
- Ahmed El-Refaey
- Department of Chemistry, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt.
| | | | | | | |
Collapse
|
20
|
Ibrahim MM, Mersal GA, Ramadan AMM, Shaban SY, Mohamed MA, Al-Juaid S. Synthesis, characterization and antioxidant/cytotoxic activity of oxovanadium(IV) complexes of methyliminodiacetic acid and ethylenediaminetetracetic acid. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.02.080] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
|
21
|
Ibrahim MM, Ramadan AEMM, Shaban SY, Mersal GAM, Soliman MM, Al-Juaid S. Thione-Based Nickel(II) Complexes as Functional Antioxidant Mimics: Scavenging Activity of Reactive Oxygen Species O2
−· and X-Ray Crystal Structure of [Ni(Ttxyly)2]2 {Ttxylyl = Hydrotris(2-mercapto-1-xylyl-imidazolyl)borate}. J Inorg Organomet Polym Mater 2017. [DOI: 10.1007/s10904-017-0573-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
|
22
|
Shaban SY, van Eldik R. Reversible release of nitric oxide from an iron(II) nitrosyl complex containing a biomimetic S4N chelate. A facile release of nitric oxide. J COORD CHEM 2017. [DOI: 10.1080/00958972.2017.1303680] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Shaban Y. Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Rudi van Eldik
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
| |
Collapse
|
23
|
Shaban SY, Ramadan AEMM, Ibrahim MM, Mohamed MA, van Eldik R. Spectroscopic, thermodynamic, kinetic studies and oxidase/antioxidant biomimetic catalytic activities of tris(3,5-dimethylpyrazolyl)borate Cu(II) complexes. Dalton Trans 2015; 44:14110-21. [PMID: 26172408 DOI: 10.1039/c5dt01817j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of copper(ii) complexes, viz. [Tp(MeMe)Cu(Cl)(H2O)] (), [Tp(MeMe)Cu(OAc)(H2O)] (), [Tp(MeMe)Cu(NO3)] () and [Tp(MeMe)Cu(ClO4)] () containing tris(3,5-dimethylpyrazolyl)borate (KTp(MeMe)), have been synthesized and fully characterized. The substitution reaction of with thiourea was studied under pseudo-first-order conditions as a function of concentration, temperature and pressure in methanol and acetonitrile as solvents. Two reaction steps that both depended on the nucleophile concentration were observed for both solvents. Substitution of coordinated methanol is about 40 times faster than the substitution of chloride. In acetonitrile, the rate constant for the displacement of coordinated acetonitrile was more than 20 times faster than the substitution of chloride. The reported activation parameters indicate that both reaction steps follow a dissociative mechanism in both solvents. On going from methanol to acetonitrile, the rate constant for the displacement of the solvent becomes more than 200 times faster due to the more labile acetonitrile, but the substitution mechanism remained to have a dissociative character. The antioxidant activities of were evaluated for superoxide dismutase (SOD), glutathione-s-transferase (GST0 and glutathione reduced (GSH-Rd) activity. and were found to show (p < 0.05) the highest antioxidant activity in comparison to and , which can be ascribed to the geometric configuration as well as the nature of the co-ligand. showed catechol oxidase activity with turnover numbers of 20 min(-1) and a coordination affinity for 3,5-DTBC of K1, = 31 mM(-1). K1 is rather large and seems to be typical for faster biomimetic models, and also for the enzyme itself (25 mM(-1)). The reaction rate depended linearly on the complex concentration, indicating a first-order dependence on the catalyst concentration.
Collapse
Affiliation(s)
- Shaban Y Shaban
- Department of Chemistry, Faculty of Science, Kafrelsheikh University, Egypt.
| | | | | | | | | |
Collapse
|
24
|
Mahmoud KR, Khodair AI, Shaban SY. Positron annihilation lifetime studies of changes in free volume on some biorelevant nitrogen heterocyclic compounds and their S-glycosylation. Appl Radiat Isot 2015; 105:303-307. [PMID: 26272166 DOI: 10.1016/j.apradiso.2015.07.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 06/27/2015] [Accepted: 07/01/2015] [Indexed: 11/30/2022]
Abstract
A series of N-heterocyclic compounds was investigated by positron annihilation lifetime spectroscopy as well as Doppler broadening of annihilation radiation (DBAR) at room temperature. The results showed that the formation probability and life time of ortho-positronium in this series are structure and electron-donation character dependent, and can give more information about the structure. The DBAR provides direct information about the change of core and valance electrons as well as the number of defect types present in these compounds.
Collapse
Affiliation(s)
- K R Mahmoud
- Physics Department, Faculty of Science, Kafrelsheikh University, 33516 El Gaish Street, Kafr El Sheikh, Egypt.
| | - A I Khodair
- Chemistry Department, Faculty of Science, Kafrelsheikh University, 33516 El Gaish Street, Kafr El Sheikh, Egypt
| | - S Y Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, 33516 El Gaish Street, Kafr El Sheikh, Egypt
| |
Collapse
|
25
|
Shaban SY, El-Kemary MA, Samir G, El-Baradei H, Puchta R. Norfloxacin La(III)-based complex: synthesis, characterization, and DNA-binding studies. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1065320] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Shaban Y. Shaban
- Faculty of Science, Department of Chemistry, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Maged A. El-Kemary
- Faculty of Science, Department of Chemistry, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Gehan Samir
- Faculty of Science, Department of Chemistry, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Hosny El-Baradei
- Faculty of Science, Department of Chemistry, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Ralph Puchta
- Inorganic Chemistry, Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany
| |
Collapse
|
26
|
Shaban SY, El-Shafai N, Mansour H, Van Eldik R. Iron(II) complexes containing the 2,6-bis-iminopyridyl moiety. Synthesis, characterization, reactivity, and DNA binding. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1031656] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Shaban Y. Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Nagi El-Shafai
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Hanaa Mansour
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Rudi Van Eldik
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Erlangen, Germany
- Faculty of Chemistry, Jagiellonian University, Krakow, Poland
| |
Collapse
|
27
|
Shaban SY, Puchta R, Eldik RV. Five-coordinate Zinc(II) Complexes Containing Sterically Demanding Bio-mimetic N3S2 Ligands. Syntheses, Characterization and DFT Calculations. Zeitschrift für Naturforschung B 2014. [DOI: 10.1515/znb-2010-0305] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In search of complexes having [ZnN3S2] cores in the monomeric form with trans-thiolate donor atoms, new sterically demanding tri- and pentadentate ligands containing biomimetic N3S2 cores have been synthesized. The reaction of bis(2-mercapto-3,5-di-tert-butylaniline)zinc(II) with 2,6- diacetylpyridine leads to the formation of the zinc imine [Zn(pytBuN2Me2S2)] (3) which is stable and can be isolated and characterized in the solid state. Complex 3 can be converted to the zinc amine function [Zn(pytBuN2H2Me2S2)] (5) without losing the metal center using NaBH4 in methanol solution. On the other hand, complex 3 can be demetallated in an acidic medium to give the tridentate bis-benzothiazoline ligand 4. Alternatively, ligand 4 can be obtained via condensation of 3,5-di-tertbutylmercaptoaniline with 2,6-diacetylpyridine in a 2:1 molar ratio. Opening the bis-benzothiazoline ligand 4 either by reduction with NaBH4 in methanol or by zinc acetate leads to the formation of the pentadentate dithiole-amine ligand pytBuN2H2Me2S2-H2 (6), and the zinc imine complex 3, respectively. Ligand 6 can also be obtained via demetallation of the zinc amine complex 5 in acidic medium. All compounds have been characterized using spectroscopic methods and elemental analysis, and also by using DFT (B3LYP/6-31G∗) calculations in combination with experimental NMR data.
Collapse
Affiliation(s)
- Shaban Y. Shaban
- Department of Chemistry and Pharmacy, Inorganic Chemistry, University of Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany b Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Ralph Puchta
- Department of Chemistry and Pharmacy, Inorganic Chemistry, University of Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
- Computer-Chemistry-Center, Department of Chemistry and Pharmacy, University of Erlangen-N¨urnberg, Nägelsbachstraße 25, 91052 Erlangen, Germany
| | - Rudi van Eldik
- Department of Chemistry and Pharmacy, Inorganic Chemistry, University of Erlangen-Nürnberg, Egerlandstraße 1, 91058 Erlangen, Germany
| |
Collapse
|
28
|
Shaban SY, Ramadan AEMM, Heinemann FW. Titanium isopropoxide complexes containing diamine bis-thiolato based [N2S2]2− ligands; effect of steric bulk on coordination features. INORG CHEM COMMUN 2012. [DOI: 10.1016/j.inoche.2012.02.035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
29
|
Shaban SY, Ibrahim MM, Heinemann FW, Van Eldik R. Seven-coordinate iron(II) complexes of sulfur-based N3S2-macrocyclic ligands: synthesis, properties, and crystal structure. J COORD CHEM 2012. [DOI: 10.1080/00958972.2012.663083] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Shaban Y. Shaban
- a Inorganic Chemistry, Department of Chemistry and Pharmacy , University of Erlangen-Nuremberg , Egerlandstr. 1 , 91058 Erlangen , Germany
- b Chemistry Department, Faculty of Science , Kafrelsheikh University , Kafrelsheikh , Egypt
| | - Mohamed M. Ibrahim
- b Chemistry Department, Faculty of Science , Kafrelsheikh University , Kafrelsheikh , Egypt
| | - Frank W. Heinemann
- a Inorganic Chemistry, Department of Chemistry and Pharmacy , University of Erlangen-Nuremberg , Egerlandstr. 1 , 91058 Erlangen , Germany
| | - Rudi Van Eldik
- a Inorganic Chemistry, Department of Chemistry and Pharmacy , University of Erlangen-Nuremberg , Egerlandstr. 1 , 91058 Erlangen , Germany
| |
Collapse
|
30
|
Abstract
The porphyrin-ferrocene conjugates ( P-nFc; n = 1, 2 and 4 ), which are simple examples of a donor-acceptor charge separation system, were synthesized. Their photoindued intramolecular and intermolecular processes have been investigated by time-resolved emission and nanosecond transient absorption techniques. Upon excitation of the porphyrins ( H 2P and ZnP ) moieties, an efficient fluorescence quenching of the excited singlet porphyrin is observed. It was found that the quenching efficiency increases with increasing number of attached ferrocene moieties and solvent polarity. The main quenching pathway involves (i) electron transfer from ferrocene to the singlet excited porphyrin and (ii) the heavy-atom effect.
Collapse
Affiliation(s)
- Hanaa Mansour
- Institut für Organische Chemie der Universität Erlangen-Nürnberg, Henkestrasse 42, 91054 Erlangen, Germany
- Department of Chemistry, Faculty of Education, Kafr Elsheikh University, Egypt
| | - Mohamed E. El-Khouly
- Department of Chemistry, Faculty of Education, Kafr Elsheikh University, Egypt
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Shaban Y. Shaban
- Department of Chemistry, Faculty of Education, Kafr Elsheikh University, Egypt
| | - Osamo Ito
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Norbert Jux
- Institut für Organische Chemie der Universität Erlangen-Nürnberg, Henkestrasse 42, 91054 Erlangen, Germany
| |
Collapse
|
31
|
Ramadan AEMM, Ibrahim MM, Shaban SY. Synthesis, characterization, and tyrosinase biomimetic catalytic activity of copper(II) complexes with schiff base ligands derived from α-diketones with 2-methyl-3-amino-(3H)-quinazolin-4-one. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2011.09.031] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
32
|
Ramadan AEMM, Shaban SY, Ibrahim MM. Synthesis, characterization, and ascorbic acid oxidase biomimetic catalytic activity of cobalt(III) oxime complexes. J COORD CHEM 2011. [DOI: 10.1080/00958972.2011.621166] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Abd El-Motaleb M. Ramadan
- a Chemistry Department, Faculty of Science , Kafr El-Sheikh University , Kafr El-Sheikh 33516, Egypt
| | - Shaban Y. Shaban
- a Chemistry Department, Faculty of Science , Kafr El-Sheikh University , Kafr El-Sheikh 33516, Egypt
| | - Mohamed M. Ibrahim
- a Chemistry Department, Faculty of Science , Kafr El-Sheikh University , Kafr El-Sheikh 33516, Egypt
| |
Collapse
|
33
|
Shaban SY, van Eldik R. Structural and mechanistic information on the nitrosation of model Fe(ii) complexes containing a biomimetic S4N chelate. Dalton Trans 2011; 40:287-94. [DOI: 10.1039/c0dt01038c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
34
|
Puchta R, Shaban SY, Mansour H, Alzoubi BM. Structural study of 2-pyridine-derived N(4)-p-tolyl thiosemicarbazone zinc(II) complexes–DFT analysis. J COORD CHEM 2010. [DOI: 10.1080/00958972.2010.492428] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Ralph Puchta
- a Inorganic Chemistry, Department of Chemistry and Pharmacy , University of Erlangen-Nürnberg , Egerlandstr. 1, 91058 Erlangen, Germany
- b Computer Chemistry Center, Department of Chemistry and Pharmacy , University of Erlangen-Nürnberg , Nägelsbachstr. 25, 91052 Erlangen, Germany
| | - Shaban Y. Shaban
- a Inorganic Chemistry, Department of Chemistry and Pharmacy , University of Erlangen-Nürnberg , Egerlandstr. 1, 91058 Erlangen, Germany
- c Department of Chemistry, Faculty of Science , Kafrelsheikh University , Kafrelsheikh 33516, Egypt
| | - Hanaa Mansour
- a Inorganic Chemistry, Department of Chemistry and Pharmacy , University of Erlangen-Nürnberg , Egerlandstr. 1, 91058 Erlangen, Germany
- c Department of Chemistry, Faculty of Science , Kafrelsheikh University , Kafrelsheikh 33516, Egypt
| | - Basam M. Alzoubi
- a Inorganic Chemistry, Department of Chemistry and Pharmacy , University of Erlangen-Nürnberg , Egerlandstr. 1, 91058 Erlangen, Germany
- d Department of Basic Science , Zarka University College, Al-Balqa Applied University , Zarka, Jordan
| |
Collapse
|
35
|
Shaban SY, Heinemann FW, Mansour H, Sellmann D. Oxidation of Ru-bound thiolate thioether and its NS4-ligand containing thiolate and thioether sulfur donors: synthesis, characterization, and X-ray structures. J COORD CHEM 2010. [DOI: 10.1080/00958972.2010.490582] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Shaban Y. Shaban
- a Department of Chemistry and Pharmacy , Inorganic Chemistry, Friedrich-Alexander University , Erlangen-Nuremberg, Egerlander Str. 1, D-91058 Erlangen, Germany
- b Faculty of Science, Department of Chemistry , Kafrelsheikh University , Kafrelsheikh 33516 Egypt
| | - Frank W. Heinemann
- a Department of Chemistry and Pharmacy , Inorganic Chemistry, Friedrich-Alexander University , Erlangen-Nuremberg, Egerlander Str. 1, D-91058 Erlangen, Germany
| | - Hanaa Mansour
- a Department of Chemistry and Pharmacy , Inorganic Chemistry, Friedrich-Alexander University , Erlangen-Nuremberg, Egerlander Str. 1, D-91058 Erlangen, Germany
- b Faculty of Science, Department of Chemistry , Kafrelsheikh University , Kafrelsheikh 33516 Egypt
| | - D. Sellmann
- a Department of Chemistry and Pharmacy , Inorganic Chemistry, Friedrich-Alexander University , Erlangen-Nuremberg, Egerlander Str. 1, D-91058 Erlangen, Germany
| |
Collapse
|
36
|
Shaban SY, van Eldik R. Mechanistic Information on the Reversible Binding of NO to Mono‐ and Dinuclear Fe
II
Complexes of a Biomimetic S
4
N Ligand. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.200900807] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shaban Y. Shaban
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen‐Nürnberg, Egerlandstr. 1, 91058 Erlangen, Germany
- Chemistry Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, Egypt
| | - Rudi van Eldik
- Inorganic Chemistry, Department of Chemistry and Pharmacy, University of Erlangen‐Nürnberg, Egerlandstr. 1, 91058 Erlangen, Germany
| |
Collapse
|
37
|
Shaban SY, Heinemann FW, van Eldik R. A New Trigonal-Bipyramidal [CuII(pytBuN3)Cl2] Complex: Synthesis, Structure and Ligand Substitution Behaviour. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900302] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
38
|
Ibrahim MM, Shaban SY. Synthesis, characterization, and crystal structures of hydrotris(2-mercapto-1-imidazolyl)borate-based zinc(II) and copper(I) complexes. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.07.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
39
|
|
40
|
|