排序方式: 共有56条查询结果,搜索用时 15 毫秒
41.
New complexes [Cr(CO)4(R2P(S)P(S)R2)] and [Cr2(CO)10(-R2P(S)P(S)R2)] (R = Me, Et, Pr
n
, Bu
n
), (1a)–(1d) and (2a)–(2d) [(1a), R = Me; (1b), R = Et; (1c), R = Pr
n
; (1d), R = Bu
n
; (2a), R = Me; (2b), R = Et; (2c), R = Pr
n
; (2d), R = Bu
n
] have been prepared by the photochemical reaction of Cr(CO)6 with R2P(S)P(S)R2 (R = Me, Et, Pr
n
and Bu
n
) and characterized by elemental analyses, FT-i.r., 31P-[1H]-n.m.r. spectroscopy and FAB-mass spectrometry. The spectroscopic data suggest cis-chelate bidentate coordination of the ligand in [Cr(CO)4(R2P(S)P(S)R2)] and cis-bridging bidentate coordination of the ligand between two metals in [Cr2(CO)10(-R2P(S)P(S)R2)] (R = Me, Et, Pr
n
and Bu
n
). 相似文献
42.
43.
Six new complexes, Mn(CO)(
5-C5H5){Ph2P(S)(CH2)
n
P(S)Ph2}] (1a–3a) [(1a), n=1; (2a), n=2; (3a), n=3] and [Mn2(CO)4(
5-C5H5)2(cis--Ph2P(S)(CH2)
n
P(S)Ph2)] (1b–3b) [(1b), n=1; (2b), n=2; (3b), n=3] have been synthesized by the photochemical reaction of [(
5-C5H5)Mn(CO)3] with Ph2P(S)(CH2)
n
P(S)Ph2 [n=1, dppm(S)2; 2, dppe(S)2; 3, dppp(S)2]. The complexes have been characterized by elemental analysis, mass spectroscopy, f.t.-i.r. and 31P–[1H]-n.m.r. spectroscopy. The spectroscopic studies reveal that coordination of the ligand iscis-chelate bidentate in [Mn(CO)(
5-C5H5){Ph2P(S)(CH2)
n
P(S)Ph2}] (1a–3a) and cis-bridging bidentate between two metals in [Mn2(CO)4(
5-C5H5)2(cis--Ph2P(S)(CH2)
n
P(S)Ph2)] (1b–3b). 相似文献
44.
Ying Li Guanjie Xu Yingfang Yao Leigang Xue Shu Zhang Yao Lu Ozan Toprakci Xiangwu Zhang 《Journal of Solid State Electrochemistry》2013,17(5):1393-1399
Si/C composite nanofibers were prepared by electrospinning and carbonization using polyacrylonitrile as the spinning medium and carbon precursor. The effect of electrolyte additive succinic anhydride (SA) on the electrochemical performance of Si/C composite nanofiber anodes was investigated. Results show that after 50 cycles, the discharge capacity of Si/C composite nanofiber anode with the SA-added electrolyte is 34 % higher than that with additive-free electrolyte. At 150th cycle, the capacity retention of Si/C composite nanofiber anode with SA-added electrolyte is 82 % under 70 % state-of-charge. It is demonstrated that adding additive SA in the electrolyte is an effective and economic way to improve the cyclability of high-capacity Si/C composite nanofibers for next-generation high-energy lithium-ion batteries. 相似文献
45.
46.
47.
Jenness GR Karalti O Al-Saidi WA Jordan KD 《The journal of physical chemistry. A》2011,115(23):5955-5964
The interaction of a water monomer with a series of linear acenes (benzene, anthracene, pentacene, heptacene, and nonacene) is investigated using a wide range of electronic structure methods, including several "dispersion"-corrected density functional theory (DFT) methods, several variants of the random phase approximation (RPA), DFT-based symmetry-adapted perturbation theory with density fitting (DF-DFT-SAPT), MP2, and coupled-cluster methods. The DF-DFT-SAPT calculations are used to monitor the evolution of the electrostatics, exchange-repulsion, induction, and dispersion contributions to the interaction energies with increasing acene size and also provide the benchmark data against which the other methods are assessed. 相似文献
48.
Ozan Erlik Naime A. Unlu Gonul Hizalan Serife O. Hacioglu Seda Comez Esra D. Yildiz Levent Toppare Ali Cirpan 《Journal of polymer science. Part A, Polymer chemistry》2015,53(13):1541-1547
In this study, four novel silafluorene (SiF) and benzotriazole (Btz) bearing conjugated polymers are synthesized. In the context of electrochemical and optical studies, these polymers are promising materials both for electrochromic device (ECD) and polymer solar cell (PSC) applications. All of the polymers are ambipolar (both p‐ and n‐dopable) and multichromic. Electrochemistry experiments indicate that incorporation of selenophene instead of thiophene unit increases the HOMO energy level of the polymers. Power conversion efficiency of the PSCs reached 1.75% for PTBTSiF, 1.55% for PSBSSiF, 2.57% for PBTBTSiF, and 1.82% for PBSBSSiF. The hole mobilities of the polymers are estimated through space charge limited current (SCLC) model. PBTBTSiF has the highest hole mobility as 2.44 × 10?3 cm2 V s?1. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015 , 53, 1541–1547 相似文献
49.
Archiv der Mathematik - We investigate branched regular finite abelian A-covers of the 2-sphere, where every homeomorphism of the base (preserving the branch locus) lifts to a homeomorphism of the... 相似文献
50.
Michael W. Blair Luiz G. Jacobsohn Ozan Ugurlu Eduardo G. Yukihara 《Journal of luminescence》2010,130(5):825-831
This work reports on the investigation of the radiation dosimetry properties of Al2O3 nanopowders. Samples were produced by solution combustion synthesis using three different organic fuels to check for the effect of synthesis conditions on the properties of interest. Luminescence characteristics were studied by thermoluminescence and optically stimulated luminescence (OSL) techniques. We found that samples produced using urea have characteristics similar to bulk Al2O3:C and may be suitable for personal dosimetry, while samples produced using glycine and hexamethylenetetramine (HMT) may be more suitable for applications where fast OSL decay is advantageous. While these results are promising and warrant further investigation, much has to be done to overcome the greatly decreased luminescence intensity of the nanomaterials as compared to bulk Al2O3:C. 相似文献