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1.
New complexes {M(CO)4[Ph2P(S)P(S)Ph2]} (M = Cr, Mo and W), (1a)–(3a), [(1a), M = Cr; (2a), M = Mo; (3a), M = W] and {M2(CO)10[-Ph2P(S)P(S)Ph2]} (M = Cr, Mo, W), [(1b)–(3b) [(1b), M = Cr; (2b), M = Mo; (3b), M = W]] have been prepared by the photochemical reaction of M(CO)6 with Ph2P(S)P(S)Ph2 and characterized by elemental analyses, f.t.-i.r. and 31P-(1H)-n.m.r. spectroscopy and by FAB-mass spectrometry. The spectra suggest cis-chelate bidentate coordination of the ligand in {M(CO)4[Ph2P(S)P(S)Ph2]} and cis-bridging bidentate coordination of the ligand between two metals in (M = Cr, Mo and W). 相似文献
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?zdemir ümmühan Karacan Nurcan ?entürk Ozan Sanlι Sert Sema U?ur Fadime 《Transition Metal Chemistry》2003,28(4):443-446
Five new complexes, [M(CO)5(apmsh)] [M = Cr; (1), Mo; (2), W; (3)], [Re(CO)4Br(apmsh)] (4) and [Mn(CO)3(apmsh)] (5) have been synthesized by the photochemical reaction of metal carbonyls [M(CO)6] (M = Cr, Mo and W), [Re(CO)5Br], and [Mn(CO)3Cp] with 2-hydroxyacetophenone methanesulfonylhydrazone (apmsh). The complexes have been characterized by elemental analysis, mass spectrometry, f.t.-i.r. and 1H spectroscopy. Spectroscopic studies show that apmsh behaves as a monodentate ligand coordinating via the imine N donor atom in [M(CO)5(apmsh)] (1–4) and as a tridentate ligand in (5). 相似文献
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Mert Mehmet Selçuk Mert Hatice Hande Sert Merve 《Journal of Thermal Analysis and Calorimetry》2019,136(4):1551-1561
Journal of Thermal Analysis and Calorimetry - Thermal energy storage systems provide efficiency in order to have better utilization of energy sources while protecting the environment. Thermal... 相似文献
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We study the Fano varieties of projective k-planes lying in hypersurfaces and investigate the associated motives.
The first author is partially supported by a grant from the Natural Sciences and Engineering Research Council of Canada. The
second author is partially supported by TüBİTAK-BDP funds and Bilkent University research development funds. 相似文献
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The ground state hydrogen conformations and vibrational analysis of 3-deazauracil (3DAU) and 6-azauracil (6AU) tautomers (4-enol and 2,4-diol forms) have been calculated using ab initio Hartree-Fock (HF) and density functional theory (B3LYP) methods with 6-311++G(d,p) basis set level. The calculations have shown that the most probably preferential tautomer of 3DAU and 6AU are the 4-enol form, which gives best fit to the corresponding experimental data. The ground state conformer of the 2,4-diol form has two O-H bonds which are oriented externally and internally (to the N-H bond). The vibrational analyses of the ground state conformer of each tautomeric form of 3DAU and 6AU were done and their optimized geometry parameters (bond lengths and bond angles) were given. Furthermore, from the correlations values it was concluded that the B3LYP method is superior to the HF method for both the vibrational frequencies and the geometric parameters. 相似文献
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A. Soylu Y. Sert O. Bayrak I. Boztosun 《The European Physical Journal A - Hadrons and Nuclei》2012,48(9):1-8
We investigate the influence of nuclear deformations of the cluster and daughter nuclei on the exotic cluster decay half-lives of $\ensuremath 221\leq A \leq 242$ for the favored cluster decay of the radioactive nuclei by using the semiclassical WKB method and the Bohr-Sommerfeld quantization condition. The results have also been presented for the spherical nuclei case in order to show clearly the effects of the deformations on the exotic decay half-lives. The half-lives become close to the experimental data when both the deformation of daughter and cluster nuclei are taken into account in the calculations. Furthermore, considering cluster deformations together with the orientation angles of daughter and cluster also provides positive contributions to the results. 相似文献
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I. Sert 《Journal of Radioanalytical and Nuclear Chemistry》2018,317(2):825-840
In present research, fifteen surficial and two profile sediment samples were studied in terms of sediment chronology and pollution degree on the ground of pollution indexes such as enrichment factor (EF), contamination factor (CF), Pollution Load Index (PLI) and lead isotope ratios (206Pb/207Pb, 208Pb/206Pb). Lead-210 (polonium-210) activity concentrations were measured by utilizing alpha spectrometry. Sediment chronology was determined via modified CRS mathematical model. Average mass accumulation rates are 0.301 and 0.227 g cm?2 year?1 in Bak?rçay River mouth and Ayval?k offshore stations respectively. Mass accumulation rates do not display the systematic increases along the cores from bottom layers to top layers. In Bak?rçay River mouth station 210Pb flux is higher than the range of global atmospheric 210Pb flux value. Due to the high CF and EF values of Sr both of stations have hydrothermal features. Ayval?k offshore station has displayed Na, Cd pollution since 1945, but Na, Cd, As, Mo, Ag pollutions have existed in Bak?rçay River mouth station since 1983 in terms of CF and EF values. According to PLI index, Bak?rçay River mouth station has “starting level pollution” degree and it displayed an “acute corruption” in 1981. 206Pb/207Pb ratios range from 1.17 to 1.25, 208Pb/206Pb ratios range from 1.99 to 2.16 in study area. When 206Pb/207Pb and 208Pb/206Pb ratios are evaluated with together, it is seen that both of the stations have had the natural (geologic) sediments since 2011. 相似文献
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Esma Erken Handan Pamuk Özlem Karatepe Gaye Başkaya Hakan Sert Orhan Murat Kalfa Fatih Şen 《Journal of Cluster Science》2016,27(1):9-23
New Pt(0) nanoparticles were easily and reproducibly prepared by the simultaneous reduction method using 1-butylamine (BA) and tributylamine (TBA) for the first time as capturing ligands at room temperature. X-ray diffraction, X-ray photoelectron microscopy and transmission electron microscopy measurements verify the formation of well-dispersed Pt(0) nanoparticles [~3.63 and ~3.98 nm for catalysts prepared using BA (catalyst I) and TBA (catalyst II), respectively] on an activated carbon surface. The catalytic performances of these nanoparticles in terms of activity, isolability and reusability were investigated for both alcohol oxidation and the dehydrocoupling of dimethylamine-borane (DMAB). These nanoparticles were shown to be as active and reusable heterogeneous catalysts even at room temperature. The prepared catalysts can catalyze the dehydrogenation of DMAB with one of the highest known activities at room temperature and also C1–C3 alcohol oxidation with very high electrochemical activities. 相似文献