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排序方式: 共有182条查询结果,搜索用时 15 毫秒
41.
Mohamed F. Meidine Catherine J. Meir Stephen Morton John F. Nixon 《Journal of organometallic chemistry》1985,297(2):255-263
Syntheses of the complexes trans-[PtCl2(PR3)Mo2(CO)4(η5-C5H5)2(tBuCP)], (PR3=PEt3, PPr3, PBu3, PPh2Me, PPhMe2) trans-[PdCl2(PBu3)Mo2(CO)4(η5-C5H5)2(tBuCP)], and trans[RhCl{(PF2NMe)2CO}Mo2(CO)4(η5-C5H5)2(tBuCP)] are described and their 31P NMR spectra presented and discussed. 相似文献
42.
Vlaar MJ Ehlers AW Schakel M Clendenning SB Nixon JF Lutz M Spek AL Lammertsma K 《Chemistry (Weinheim an der Bergstrasse, Germany)》2001,7(16):3545-3550
The terminal phosphinidene complex PhPW(CO)5 reacts with 2,4,6-tri-tert-butyl-1,3,5-triphosphabenzene to give two unexpected multicyclic organophosphorus compounds. One of them results from an initial 1,2-addition, followed by an intramolecular rearrangement. B3LYP/6-31G* calculations on simplified parent systems suggest that the reaction follows a unique concerted reaction pathway. The second, and major, product is a tetraphosphaquadricyclane derivative, which presumably results from an intramolecular [2+2] cycloaddition of an intermediate tetraphosphanorbornadiene complex. Single-crystal X-ray structures are presented for both products. 相似文献
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44.
Asymptotic Analysis of Pulse Dynamics in Mode-Locked Lasers 总被引:1,自引:0,他引:1
By Mark J. Ablowitz Theodoros P. Horikis Sean D. Nixon Yi Zhu 《Studies in Applied Mathematics》2009,122(4):411-425
Solitons of the power-energy saturation (PES) equation are studied using adiabatic perturbation theory. In the anomalous regime individual soliton pulses are found to be well approximated by solutions of the classical nonlinear Schrödinger (NLS) equation with the key parameters of the soliton changing slowly as they evolve. Evolution equations are found for the pulse amplitude(s), velocity(ies), position(s), and phase(s) using integral relations derived from the PES equation. The results from the integral relations are shown to agree with multi-scale perturbation theory. It is shown that the single soliton case exhibits mode-locking behavior for a wide range of parameters, while the higher states form effective bound states. Using the fact that there is weak overlap between tails of interacting solitons, evolution equations are derived for the relative amplitudes, velocities, positions, and phase differences. Comparisons of interacting soliton behavior between the PES equation and the classical NLS equation are also exhibited. 相似文献
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Complexes of the type M(CO)5L (L = benzo[c]cinnoline and phenanthridine; M = Cr, Mo, W) have been prepared and the nature of the bonding established by NMR studies. 相似文献
48.
Rather E Gatlin JT Nixon PG Tsukamoto T Kravtsov V Johnson DW 《Journal of the American Chemical Society》2005,127(10):3242-3243
We report the single-crystal structure of an inorganic gallium cluster [Ga13(mu3-OH)6(mu2-OH)18(H2O)24](NO3)15.6H2O prepared using a simple organic reaction to drive the formation of the crystalline inorganic cluster. 相似文献
49.
Hossein Eshtiagh-Hosseini Harold W. Kroto John F. Nixon Osamu Ohashi 《Journal of organometallic chemistry》1979,181(2):C1-C3
The previously postulated phosphaalkene intermediate CF3 P=CF2 in the alkaline hydrolyses of (CF3)2 PH has been trapped and characterised by its 19F and 31P NMR spectra. 相似文献
50.
Syntheses of Co2Rh2(CO)8(PF3)4 and Co2Rh2(CO)10(PF3)2 are described and their structures are discussed. Evidence is presented for an intermolecular ligand exchange between several tetranuclear cluster complexes. 19F and 31P NMR and mass spectroscopic data are presented and discussed. The complexes Rh4(CO)4(PF3)8 and Co2Ir2(CO)8(PF3)4 have been identified by their mass spectra. 相似文献