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1.
Aydin Tavman Naz M. Agh-Atabay Sadik Guner Fahrettin Gucin Basaran Dulger 《Transition Metal Chemistry》2007,32(2):172-179
2-(5-H/Me/Cl-1H-benzimidazol-2-yl)-phenol ligands form 1:1 electrolytes, 5-coordinate monometallic complexes with iron(III) nitrate. The geometry of the [Fe(L)(OH)(H2O)2](NO3) complexes was derived from theoretical calculation in DGauss/DFT level (DZVP basis set) on CACHE. In all of the complexes
the ligands are bidentate, via one imine nitrogen atom and phenolate oxygen atom. The coordination is completed with a hydroxide ion, and two water molecules,
adopting a distorted square pyramidal geometry. The structures of the compounds were confirmed on the basis of elemental analysis,
molar conductivity, magnetic moment, FT-Raman, FT-IR (mid-IR, far-IR), EPR and u.v.–vis. The antimicrobial activities of the
free ligands, their hydrochloride salts, and the complexes were evaluated using the disk diffusion method in dimethyl sulfoxide
(DMSO) as well as the minimal inhibitory concentration (MIC) dilution method, against nine bacteria and the results are compared
with several known antibiotic agents. Antifungal activities were reported for Candida albicans, Kluyveromyces fragilis, Rhodotorula rubra, Debaryomyces hansenii, Hanseniaspora guilliermondii, and the results were referenced against nystatin, ketaconazole, and clotrimazole antifungal agents. In most cases, the compounds
tested showed broad-spectrum (Gram+ & Gram− bacteria) activities that were either more active or as potent as the references. 相似文献
2.
Aydin Tavman Serkan Ikiz A. Funda Bagcigil N. Yakut Özgür Seyyal Ak 《Russian Journal of Inorganic Chemistry》2010,55(2):215-222
2-Methyl-6-(5-H-methyl-chloro-nitro-1H-benzimidazol-2-yl)-phenols( HL
x
:x= 1-4)ligands and HL1 complexes with Fe(NO3)3, Cu(NO3)2, AgNO3, Zn(NO3)2 have been synthesized and characterized. The structures of the compounds were confirmed on the basis of elemental analysis,
molar conductivity, magnetic moment, FT-IR, 1H-and 13C-NMR. Antibacterial activity of the free ligands, their hydrochloride salts and the complexes were evaluated using the disk
diffusion method in dimethyl sulfoxide as well as the minimum inhibitory concentration dilution method, against nine bacteria.
While HL1 ligand has not any activity, it’s Ag(I) complex show antibacterial effect toward almost to all the bacteria. Zn(II) complex
has antibacterial effect on especially K. pneumoniae, S. epidermidis and S. aureus bacteria. 相似文献
3.
The 1,2-bis-(2-benzimidazolyl)-1,2-ethanediol (EH2) and 1,4-bis-(2-benzimidazolyl)-1,2,3,4-butanetetraol (TH4) ligands form 4-coordinate mono- and bi-metallic complexes with PdCl2, respectively. In Pd(EH2)Cl2 the ligand acts as a bidentate through two of the nitrogen atoms. On the other hand, in Pd2(TH4)Cl4 the ligand coordinates to two palladium atoms through both bis-benzimidazole nitrogen atoms and two oxygen atoms of the hydroxy groups, forming two different isomers. The complexes were characterised by analytical data, magnetic susceptibility, molar conductivity, and also by i.r., 1H- and 13C-n.m.r. spectra. 相似文献
4.
Aydin Tavman Mustafa Hayvali Hayati Filik Emine Kiliç 《Russian Journal of Inorganic Chemistry》2006,51(8):1198-1201
The complexes of 2,2′-(1,4-Phenylenedivinylene)-bis-8-hydroxyquinoline (LH2) with K2PdCl4, H2PtCl6 and HAuCl4 were synthesized and characterized with 1H-and 13C-NMR, elemental analysis, FT-IR, and molar conductivity. Au(III) and Pt(IV) complexes have characteristic conductance, while
the Pd(II) complex has a non-ionic structure according to the molar conductivity and elemental analysis.
This text was submitted by authors in English. 相似文献
5.
A. Turgut C. Sauter M. Chirtoc J. F. Henry S. Tavman I. Tavman J. Pelzl 《The European physical journal. Special topics》2008,153(1):349-352
We present a new application of a hot wire sensor for
simultaneous and independent measurement of thermal conductivity k and
diffusivity α of (nano)fluids, based on a hot wire thermal probe with ac
excitation and 3 ω lock-in detection. The theoretical modeling of imaginary
part of the signal yields the k value while the phase yields the α value. Due
to modulated heat flow in cylindrical geometry with a radius comparable to
the thermal diffusion length, the necessary sample quantity is kept very
low, typically 25μl. In the case of relative measurements, the
resolution is 0.1% in k and 0.3% in α. Measurements of water-based
Aerosil 200V nanofluids indicate that ultrasound treatment is more efficient
than high pressure dispersion method in enhancing their thermal parameters. 相似文献
6.
Aydin Tavman Naz M. Agh-Atabay Abdollah Neshat Fahrettin Gucin Basaran Dulger Durata Haciu 《Transition Metal Chemistry》2006,31(2):194-200
2-(5-H/methyl-1H-benzimidazol-2-yl)-4-bromo/nitro-phenol (HLx:X=1–4) ligands and their iron(III) nitrate complexes have been synthesized and characterized. In all of the complexes, the
ligands are bidentate, via one imine nitrogen atom and a phenolate oxygen atom. The coordination is completed with a bidentate nitrate anion, and a
water molecule. Elemental analysis, molar conductivity, magnetic susceptibility, FT-Raman, FT-IR (mid i.r., far i.r.), UV–visible
and as well as quantum chemical calculations performed with CACHE are in agreement with a 1:1 electrolyte structures that
are mononuclear, and distorted 5-coordinate square pyramidal. The antimicrobial activities of free ligands, their hydrochloride
salts and the complexes were evaluated using the disk diffusion method in dimethyl sulfoxide (DMSO) toward nine bacteria,
each with multiple, fresh clinical isolates, and the results are compared with those for penicillin-g, ampicillin, cefotaxime,
vancomycine, oflaxacin and tetracycline. Antifungal activities were reported for Kluyveromyces fragilis, Rhodotorula rubra, Candida albicans, Hanseniaspora Guilliermondii and Debaryomyces hansenii yeasts, each with multiple isolates, and the results were referenced against nystatin, ketaconazole and clotrimazole antifungal
agents. In most cases, the compounds tested showed broad-spectrum (Gram+ and Gram−) activities that were either more active or as potent as the references particularly as antifungal agents. 相似文献
7.
Aydin Tavman 《Russian Journal of Inorganic Chemistry》2010,55(3):377-383
2-(2-Hydroxy-5-methylphenyl)-1H-benzimidazole ligand (HL) and its complexes with Cu(NO3)2, Zn(NO3)2 have been synthesized and characterized. The structures of the compounds were confirmed on the basis of elemental analysis,
molar conductivity, magnetic moment, FT-IR, 1H- and 13C NMR. Cu(II) complex has 1: 2 metal: ligand ratio, while Zn(II) complex is 1: 1. Crystal structure of 2-(2-hydroxy-5-methylphenyl)-1H-benzimidazolium chloride (HL · HC1) was determined by single-crystal X-ray diffraction. It crystallizes in the orthorombic,
space group P212121and Z = 4. 相似文献
8.
In most applications, nanoparticles are required to be in a well-dispersed state prior to commercialisation. Conventional technology for dispersing particles into liquids, however, usually is not sufficient, since the nanoparticles tend to form very strong agglomerates requiring extremely high specific energy inputs in order to overcome the adhesive forces. Besides conventional systems as stirred media mills, ultrasound is one means to de-agglomerate nanoparticles in aqueous dispersions. In spite of several publications on ultrasound emulsification there is insufficient knowledge on the de-agglomeration of nanoparticulate systems in dispersions and their main parameters of influence. Aqueous suspensions of SiO2-particles were stressed up to specific energies EV of 10(4) kJ/m3 using ultrasound. Ultrasonic de-agglomeration of nanoparticles in aqueous solution is considered to be mainly a result of cavitation. Both hydrostatic pressure of the medium and the acoustic amplitude of the sound wave affect the intensity of cavitation. Furthermore, the presence of gas in the dispersion medium influences cavitation intensity and thus the effectiveness of the de-agglomeration process. In this contribution both, the influence of these parameters on the result of dispersion and the relation to the specific energy input are taken into account. For this, ultrasound experiments were carried out at different hydrostatic pressure levels (up to 10 bars) and amplitude values (64-123 microm). Depending on the optimisation target (time, energy input,...) different parameters limit the dispersion efficiency and result. All experimental results can be explained with the specific energy input that is a function of the primary input parameters of the process. 相似文献
9.
A series of N‐(5‐chloro‐2‐hydroxyphenyl)‐(3/4/5‐substituted)‐salicylaldimines ( I – XI ) were synthesized using appropriate synthetic route. Their structures were characterized by FT‐IR, UV‐Visible, ESI‐MS, 1H and 13C NMR spectroscopic techniques and analytical methods. The crystal structure of N‐(5‐chloro‐2‐hydroxyphenyl)‐5‐bromosalicylaldimine ( V ) was determined by X‐ray diffraction at room temperature. Relationship between the melting points and the structures of the compounds was examined. Antimicrobial activity of the compounds was evaluated against Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Proteus mirabilis. Antifungal activities were reported for Candida albicans. Schiff bases showed considerable antimicrobial activity against S. aureus, S. epidermidis and C. albicans. N‐(5‐Chloro‐2‐hydroxyphenyl)‐3‐hydroxy‐salicylaldimine ( II ) has the broadest and highest antimicrobial activity according to the others. 相似文献
10.
Synthesis,Spectral Characterization and Antimicrobial Activity of Some Transition Metal Complexes of 1,3‐Bis(1H‐benzimidazol‐2‐yl)‐2‐oxapropane
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Aydin Tavman Adem Çinarli Demet Gürbüz A. Seher Birteksöz Tan M. A. Faruk Öksüzömer Mayram Tüysüz Mehmet Ali Gürkaynak Bahattin Yalçin 《中国化学会会志》2014,61(12):1377-1387
1,3‐Bis(1H‐benzimidazol‐2‐yl)‐2‐oxapropane ( L ) complexes with Fe(NO3)3, CoCl2, Co(NO3)2, Ni(NO3)2, CuCl2, Cu(ClO4)2, PdCl2, CdI2, Hg(NO3)2 were synthesized and characterized by elemental analysis, molar conductivity, magnetic moment, TGA, FT‐IR, NMR, ESI‐MS, fluorescence spectroscopy. Also, the crystal structure of 1,3‐bis(1H‐benzimidazol‐2‐yl)‐2‐oxapropane]dichlorocobalt(II), [Co( L )Cl2], complex is reported that it has distorted trigonal bipyramidal geometry. Antibacterial activities of the compounds were evaluated using the disk diffusion method against six bacteria and Candida albicans. The Hg(II) complex shows superior activity toward S. epidermidis and E. coli whereas the other complexes are ineffective except the Co(NO3)2 complex: it showed weak activity toward all of the microorganisms. 相似文献