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| 1 | Impedance spectroscopy and DFT/TD-DFT studies of diyttrium trioxide for optoelectronic fields显示文摘Yttrium(Ⅲ)oxide or so-called diyttrium trioxide(Y_2O_3)is an excellent candidate ceramic material for optoelectronic applications.Structural,electrical conductivity,and dielectric relaxation properties of bulk yttrium(Ⅲ)oxide were studied.X-ray diffraction(XRD)results indicate that the yttrium(Ⅲ)oxide compound has a crystalline cubic phase.Fourier transform infrared(FTIR)technique was used to ascertain the chemical structure of the yttrium(Ⅲ)oxide compound.Impedance spectroscopy was used to analyze frequency-dependent electrical properties as a function of temperature in the range of 303-423 K and frequency range of 0.1 Hz-2 MHz.Impedance spectroscopy parameters such as dielectric constant,dielectric loss,loss factor,electric modulus,and complex impedance of the yttrium(Ⅲ)oxide compound were studied.The Nyquist plot describes the complex impedance of the yttrium(Ⅲ)oxide for different temperatures.The universal Jonscher's power law was used for the analysis of the complex electrical conductivity of the yttrium(Ⅲ)oxide compound.It is found that the real(σ')and imaginary(σ')parts of the complex conductivity increase with increasing frequency.The exponent frequency(s)equals unity,which confirms that the predominant conduction mechanism is a nearly constant loss(NCL)mechanism.DFT/TD-DFT studies using B3LYP/LanL2DZ level of theory were used to provide comparable theoretical data and electronic energy gap of HOMO→LUMO. | Ali A.Alkathiri A.A.Atta Moamen S.Refat Sonam Shakya A.M.Hassanien Saud A.Algarni Emad M.A.Ahmed Sultan E.Alomariy Mohammed Alsawat Norah Algethami | 2023 | Journal of Rare Earths2023，41，4： | 0 |
| 2 | Charge-transfer interaction of drug quinidine with quinol,picric acid and DDQ: Spectroscopic characterization and biological activity studies towards understanding the drug–receptor mechanism显示文摘Investigation of charge-transfer(CT) complexes of drugs has been recognized as an important phenomenon in understanding of the drug–receptor binding mechanism. Structural, thermal, morphological and biological behavior of CT complexes formed between drug quinidine(Qui) as a donor and quinol(QL), picric acid(PA) or dichlorodicyanobenzoquinone(DDQ) as acceptors were reported. The newly synthesized CT complexes have been spectroscopically characterized via elemental analysis;infrared(IR), Raman,1H NMR and electronic absorption spectroscopy; powder X-ray diffraction(PXRD); thermogravimetric(TG) analysis and scanning electron microscopy(SEM). It was found that the obtained complexes are nanoscale, semi-crystalline particles, thermally stable and spontaneous. The molecular composition of the obtained complexes was determined using spectrophotometric titration method and was found to be 1:1 ratios(donor:acceptor). Finally, the biological activities of the obtained CT complexes were tested for their antibacterial activities. The results obtained herein are satisfactory for estimation of drug Qui in the pharmaceutical form. | Hala H.Eldaroti Suad A.Gadir Moamen S.Refat Abdel Majid A.Adam | 2014 | Journal of Pharmaceutical Analysis2014，4，2： | 0 |
| 3 | Spectroscopic and Fluorescence Studies on the Trivalent Ce,Eu,Nd and La Metal Ions Rhodamine CFlorescent Dye Complexes显示文摘The four isolates solid complexes:[La(RHC)(NO_(3))_(2)]·3H_(2)O,[Nd(RHC)(NO_(3))_(2)]·4H_(2)O,[Eu(RHC)(NO_(3))_(2)]·2H_(2)O,and[Ce(RHC)(NO_(3))_(2)]·5H_(2)O that obtained by the reaction of the nitrate salts of the Ce(Ⅲ),Eu(Ⅲ),Nd(Ⅲ)and La(Ⅲ)ions and rhodamie C(RHC)ligand were interpretative using elemental analysis(C,H and N),molar conductivity,infrared,electronic,fluorescence and 1H-NMR spectra to achieve the speculated suitable formula.The low molar conductance values of the synthesized RHC complexes concluded the non-electrolytic behavior.The infrared spectra recorded the absence of stretching vibrationν(OH)of the—COOH and presence of two new vibration bands at 1597~1601 and 1383~1399 cm^(-1)which were assigned toνas(COO-)andνs(COO-).The difference between them revealed that the carboxylate group acts as a bidentate ligand.1HNMR spectra of Europium and lanthanum(Ⅲ)complexes were supported the FTIR results based on the absent of proton of the carboxylic group.Therefore,the microanalytical and spectroscopic results deduced that RHC acts as a monobasic bidentate ligand,and coordinated to the central metal(Ⅲ)ions via the two oxygen atoms of deprotonated carboxylic group.Fluorescence studies were performed on the metal complexes of Ce^(3+),Tb^(3+),Th^(4+),Gd^(3+)and La^(3+),that referred a quenching in the fluorescene intensity of rhodamine C in the aqueous state after complexation.The antimicrobial assessment against some kind of bacteria and fungi were also checked and recorded enhancement in case of their complexes. | Moamen S.Refat Mahmoud Salman Akram M.El-Didamony Hammad Fetooh Eman S.E.Abd El-Maksoud Mohamed Y.El-Sayed | 2021 | 光谱学与光谱分析2021，41，10： | 0 |
| 4 | In First Time:Synthesis and Spectroscopic Interpretations ofManganese(Ⅱ),Nickel(Ⅱ)and Mercury(Ⅱ)Clidinium Bromide Drug Complexes显示文摘Clidinium is a synthetic anticholinergic agent which has been shown in experimental and clinical studies to have an antispasmodic and antisecretory effect on the gastrointestinal tract.Inhibits the muscarinic effects of acetylcholine at neurotransmitter sites after parasympathetic ganglia.It is used to treat peptic ulcer disease and to help relieve stomach or stomach cramps or cramps due to abdominal cramps,diverticulitis,and irritable bowel syndrome.Mononuclear complexes of the manganese(Ⅱ),nickel(Ⅱ)and mercury(Ⅱ)with clidinium bromide drug(C_(22)H_(26)NO_(3))types[M(C_(22)H_(25)NO 3)_(2)(H_(2)O)_(4)]and[Hg(C_(22)H_(25)NO_(3))_(2)(H_(2)O)_(2)]where M=Mn(Ⅱ)and Ni(Ⅱ),have been synthesized and characterized on the basis of elemental analysis,conductivity measurements,magnetic,electronic,1H-NMR and infrared spectral studies.The complexes confirm to 1∶2 stoichiometry and are non-electrolytes.The clidinium drug ligand(C_(22)H_(26)NO_(3))act as a deprotonated monovalent monodentate chelate coordinating through hydroxyl oxygen where IR spectral bands of clidinium bromide shows a band at 3226 cm^(-1)assigned to the OH group stretching frequency,this bandν(O—H)stretching vibration motion is disappeared in case of the infrared spectra of the Mn(Ⅱ),Ni(Ⅱ),and Hg(Ⅱ)complexes suggesting the involvement of the oxygen atom of the deprotonated OH group of clidinium ligand in complexation.The band for theν(C—O)of alcoholic group of clidinium that appears at 1240 cm^(-1)has blue shifted after complexity,indicating the participation of the alcoholic group in the coordination.1H NMR spectrum for clidinium bromide show a singlet peak at 3.65 ppm due to proton of OH group which isn’t observed in the spectrum of mercury(Ⅱ)complex referring to the deprotonation of OH group and participated in the complexation.Based on electronic spectra,IR spectra and magnetic moment measurements;six coordinated octahedral structures have been proposed for the manganese and nickel(Ⅱ)complexes,while mercury(Ⅱ)complex has a four coordinated geometry.Thermogravimetric analyses studies revealed the presence of coordinated water molecules.For instance the X-ray powder diffraction pattern and scanning electronic microscopy for the Hg(Ⅱ)complex deduced that it was isolated in nanostructured with crystallinity form. | Samy M.El-Megharbel Moamen S.Refat | 2021 | 光谱学与光谱分析2021，41，10： | 0 |
| 5 | Synthesis and Spectroscopic Investigations of Four New Y(Ⅲ), Ge(Ⅳ), W(Ⅵ) and Si(Ⅳ) Penicillin Antibiotic Drug Complexes显示文摘A four new penicillinate complexes were prepared through the chemical interactio ns of penicillin potassium salt (Pin) with YCl 3, GeCl 4, WCl 6 and SiCl 4 m etal ions. These metal complexes were characterized using spectroscopic techniqu es (e.g. 1H-NMR, infrared, electronic UV-Vis) as well as elemental, cond uctivity, and magnetic measurements. The molar conductance values were highly, s howing their electrolytic nature. The magnetic and electronic study strongly rec ommends the octahedral geometry of all penicillinate complexes. A monomeric stru ctures of Pin complexes are proposed with octahedral coordinated metals ions. Th e metal ions are coordinated toward Pin as tridentate ligand through the amide a nd β-lactam carbonyls and a carboxylate group from penicillin. The in vitro antimicrobial activity of all the complexes, at concentrations in μg·mL^-1 , was screened against four bacterial pathogens, namely, Bacillus subtilis , Escherichia coli, Pseudomonas aeruginosa , and Staphylococcus aureus , and two kinds of fungi Aspergillus flavus and Candida albicans showed better activi ty compared to parent drug and control drug. The anti-cancer inhibition of the tungsten(Ⅵ) complex was assessed against the human hepato cellular carcinoma (H epG-2) tumor cell line with IC50 value is 646 μg·mL^-1 . | Abeer A.El-Habeeb Moamen S.Refat | 2019 | 光谱学与光谱分析2019，39，9： | 0 |
| 6 | Preparations and Spectroscopic Studies on the Three New Strontium(Ⅱ),Barium(Ⅱ),and Lead(Ⅱ)Carbocysteine Complexes显示文摘Carbocisteine,also known as carbocysteine,is a mucolytic that reduces the viscosity of sputum and thus can be used to help relieve symptoms of chronic obstructive pulmonary disorder and bronchiectasis by allowing the sufferer to expel sputum more easily.A total of three new metal complexes of carbocysteine,HCcy with the metal ions Sr(Ⅱ),Ba(Ⅱ),and Pb(Ⅱ)have been successfully prepared in alkaline medium in situ H_(2)O/CH_(3)OH(50/50 w/w).The complexes obtained are characterized quantitatively and qualitatively by using micro elemental analysis,FTIR spectroscopy,UV-Vis spectroscopy,X-ray powder diffraction spectroscopy,^(1)H-NMR,and conductivity measurements.From the spectral study,all the synthesized Ccy complexes obtained as monomeric structure and the metals center moieties are six-coordinated except lead(Ⅱ)complex which existed as a four-coordinated respectively,suggesting formulas[Sr(Ccy)(H_(2)O)_(2)],[Ba(Ccy)(H_(2)O)_(2)]and[Pb(Ccy)]in neutral form.Beside,regarding both Sr(Ⅱ)and Ba(Ⅱ)complexes,the aquo groups are existed inside the coordination sphere.The infrared assignments reveal that HCcy ligand act as a bidentate ligand with the metal ions through oxygens of the deprotonated carboxylic COOH group.The 1H-NMR spectrum of the[Ba(Ccy)(H_(2)O)_(2)]complex has an absent of the proton of-COOH groups upon the deprotonated of carboxylic group. | Samy M.El-Megharbel Moamen S.Refat | 2021 | 光谱学与光谱分析2021，41，9： | 0 |
| 7 | Synthesis and Spectroscopic Characterizations of New Mercury(Ⅱ), Cerium(Ⅲ), and Thorium(Ⅳ) Captopril Drug Complexes显示文摘In this article, three types of metal ions with different oxidation state as mercury(Ⅱ), cerium(Ⅲ) thorium(Ⅳ) have been reacted with captopril drug(CAP). The isolated solid complexes were explained using elemental analysis, conductance measurements, infrared and 1H-NMR spectroscopy as well as the thermo gravimetric(TG/DTG) analysis. The micro analytical and spectroscopic results for all CAP complexes were agreement with the speculated structures. The stoichiometry for divalent Hg^2+, trivalent Ce^3+ and tetravalent Th(4+) metal ions with CAP ligand was established with 1∶2(M(n+):CAP) molar ratio. The qualitative analysis showed that in case of the mercury(Ⅱ) complex, the chloride ions didn't involved in the complexity, suggesting formula [Hg(CAP)2] in neutral form. However, regarding both Ce(Ⅲ) and Th(Ⅳ) complexes as [Ce(CAP)2(NO3)]·3 H2O and [Th(CAP)2(NO3)2(H2O)]·3 H2O formulas, the nitrate group is existed inside the coordination sphere. The infrared analysis data proved that CAP drug act as a bidentate ligand with the metal ions of Ce(Ⅲ) and Th(Ⅳ) through oxygen carbonyl group C=O and oxygen of the deprotonated carboxylic COOH group, while for the Hg(Ⅱ) complex, the CAP acts as a bidentate ligand through oxygen of C=O group and sulfur atom of the deprotonated -SH group. Thorium(Ⅵ) complex has a nine-coordinate geometry, while Hg(Ⅱ) and Ce(Ⅲ) have a four and six-coordination behaviors respectively. The 1H-NMR data of the CAP compound has a singlet sharp signal at 1.90 ppm due to the proton of -SH group, this peak absent in the spectrum of the Hg(Ⅱ) CAP complex upon the deprotonated of thiol group. | Samy M.El-Megharbel Moamen S.Refat | 2020 | 光谱学与光谱分析2020，40，11： | 0 |
| 8 | Synthesis, Spectroscopic and Antimicrobial Investigations of Scandium(Ⅲ) Complexes with Four Kinds of Sulfa Drugs显示文摘Herein,this article was focused on the synthesis and discussed the spectroscopic characterizations of four new scandium(Ⅲ)sulfa-drug complexes.The nomenclature and symbols of these drugs were sulfadimidine(sulp-1),sulfanilamide(sulp-2),sulfamethoxazole(sulp-3)and sulfadiazine(sulp-4).The microanalytical and spectroscopic analyses which utilized in this study were micro-analyses,magnetic,FT-IR,UV-Vis techniques.The mid infrared spectra deduced that the four sulfa-drug chelates acts as a bidentate chelates with scandium(Ⅲ)ion via two nitrogen atoms of-NH2-Ar and-NH-SO2 groups.Also,the FTIR spectra of Sc3+complexes referred to the existed of new medium weak bands in the range of 500~400 cm^-1 due to stretching vibration bands ofν(M-N).The elemental analysis technique confirmed the 1∶2 stoichiometry between Sc3+ions and sulp ligand with molecular formula[Sc(sulp)2(Cl)2]·Cl.At room temperature,the results of magnetic measurements for the Sc(Ⅲ)complexes indicated that all of the synthesized complexes have a diamagnetic character with octahedral configuration.The electronic spectra of the free sulfa-drug ligands shows band at 275 and 310 nm which are intraligand charge transfer band.The electronic sbsorption spectra of the Sc3+complexes were recorded using DMSO solvent.The spectra of complexes display bands within 275~388 nm,which attributed toπ-π*,n-π*and charge-transfer M-LCT electronic transitions,which strongly favors the octahedral geometry around Sc(Ⅲ)metal ions.1HNMR spectra of complexes referred to the downfield proton shifts of the-NH2 and NHSO2 groups,which supported the place of coordination.The half maximal inhibitory concentration(IC50)of the ScⅢcomplexes was assessed against the human hepato cellular carcinoma(HepG-2)tumor cell line. | Moamen S.Refat Abeer A.El-Habeeb | 2020 | 光谱学与光谱分析2020，40，3： | 0 |
| 9 | Preparation and Spectroscopic of Vanadyl(Ⅱ) Vitamin D3 Amino Acid Mixed Complexes as Insulin Mimetic Drug显示文摘A new six intraperitoneal injection insulin-mimetic vanadyl(Ⅱ) compounds [(VD3^-1)(VO^+2)(AAn^-1)](where(n=1~6);AA1=isoleucine, AA2=threonine, AA3=proline, AA4=phenylalanine, AA5=lysine and AA6=glutamine) were synthesized by the chemical reactions between vitamin D3(VD3), VOSO4 and amino acids(AAn) with equal molar ratio 1∶1∶1 in neutralized media. The structures of these complexes were elucidated by spectroscopic methods like, infrared and solid reflectance spectroscopes. Magnetic moments and electronic spectra reveal square pyramid geometrical structure of the complexes. The infrared spectra assignments of these complexes revealed that the chelation towards vanadyl(Ⅳ) ions existed via deprotonation of the hydroxyl group of VD3 drug ligand and so amino acids act as bidentate ligand via N-amino and O-carboxylate groups. The anti-diabetic efficiency of these complexes were evaluated against streptozotocin induced diabetic male albino rats. | Enas Aljuhani Amnah M.A.Alsuhaibani A.M.El-Di damony N.Hassan Sameh Abo Taleb Moamen S.Refat | 2019 | 光谱学与光谱分析2019，39，7： | 0 |
| 10 | Estimation of Metformin Drug for the Diabetes Patients by Simple,Quick and Cheap Techniques within the Formation of Colored Charge Transfer Complexes显示文摘Metformin(Met)is a drug developed for the treatment of patients with typeⅡ diabetes.Recently,Met estimation in pharmaceutical formulations and human fluids has gained a growing interest.To extend requisite data that can be used to assessment of Met quantitatively based on charge-transfer(CT)complexation,the present study describes the synthesis and characterization of CT complexes that formed between drug Met and the organicπ-acceptors picric acid(PA),chloranilic acid(CLA),chloranil(CHL),7,7',8,8'-tetracyanoquinodimethane(TCNQ),and dichlorodicyanobenzoquinone(DDQ).The properties of the formed CT complexes were investigated by elemental,spectral(UV-visible,IR,and Raman spectroscopies),thermal(TG)and morphological(SEM)studies.IR results indicated that the complexation of Met with either PA or CLA acceptors occurs through proton transfer interaction,whereas its complexation with CHL,TCNQ,or DDQ acceptors occurs through n→π*interaction. | Omar B.Ibrahim El-Sayed A.Manaaa M.M.AL-Majthoub Ahm ed M.Fallatah Abdel Majid A.Adam Mha M.Alatibi Jehan Y.A l-Humaidi Moamen S.Refat | 2018 | 光谱学与光谱分析2018，38，11： | 0 |
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