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31.
C. Mahr 《Fresenius' Journal of Analytical Chemistry》1936,104(7-8):241-245
Ohne Zusammenfassung 相似文献
32.
Schwab P Wolf J Mahr N Steinert P Herber U Werner H 《Chemistry (Weinheim an der Bergstrasse, Germany)》2000,6(24):4471-4478
Novel dinuclear rhodium complexes of the general composition [Rh2Cl2(mu-CRR')2(mu-SbiPr3)] (4-6) were prepared by thermolysis of the mononuclear precursors trans-[RhCl(=CRR')(SbiPr3)2] in excellent yield. The X-ray crystal structure analysis of 4 (R = R' = Ph) confirms the symmetrical bridging position of the stibane ligand. Related compounds [Rh2Cl2(mu-CPh2)(mu-CRR')(mu-SbiPr3)] (7, 8) with two different carbene units were obtained either from trans-[RhCl(=CPh2)(SbiPr3)2] (1) and RR'CN2 or by a conproportionation of 4 and 5 (R = R' = p-Tol) or 4 and 6 (R= Ph, R' = p-Tol), respectively. While CO reacts with 4 to give the polymeric product [[RhCl(CPh2)(CO)]n] (9), tert-butyl isocyanide replaces the bridging stibane and yields [Rh2Cl2(mu-CPh2)2(mu-CNtBu)] (10). The reaction of 4 with tertiary phosphanes PR3 leads to complete bridge cleavage and affords the mononuclear compounds trans-[RhCl(=CPh2)(PR3)2] (11-15). In contrast, treatment of 4 with SbMe3 and SbEt3 yields the related triply bridged complexes [Rh2Cl2(mu-CPh2)2(mu-SbR3)] (16, 17) by substitution of SbiPr3 for the smaller stibanes. The displacement of the chloro ligands in 4-6 and 10 by n5-cyclopentadienyl gives the dinuclear complexes [(n5-C5H5)2Rh2(mu-CRR')2] (18-20) and [(n5-C5H5)2Rh2(mu-CPh2)2(mu-CNtBu)] (21), of which 18 (R = R' = Ph) was characterized crystallographically. 相似文献
33.
34.
G. Hermann B. Kaulakys G. Mahr 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1998,1(2):129-137
Results of broadening and shift measurements of Doppler-free two-photon lines for transitions from the ground state to the
Rydberg states with intermediate principle quantum numbers of atomic thallium perturbed by rare gases are reported. The rates
show a distinct behaviour in this range of principle quantum numbers and significant dependence on the total angular momentum
of the upper nP state. The experimental results are compared with calculations using a Van der Waals potential and a superposition of polarization
and Fermi potentials. Additionally, broadening and shift rates of the transition Tl 6P
3/2
-9P
3/2
have been measured for quadrupolar as well as for mainly scalar excitation. The rates for both kinds of excitation coincide
within the limits of error reflecting the small perturbation of the 6P
3/2
state compared to that of the upper 9P
3/2
state.
Received: 6 August 1997 / Revised in final form: 29 November 1997 / Accepted: 11 December 1997 相似文献
35.
A new sensitive method is reported for the measurement of picosecond duration luminescence change upon saturation from photoexcited samples. Examples of 600 ps and 20 ps lifetimes are given. 相似文献
36.
37.
Ohne Zusammenfassung 相似文献
38.
We report the first observation of very precise time-resolved luminescence from highly photoexcited platelets of CdSe at 1.8 K. The time dependence of both spontaneous and stimulated emission are presented. The results are taken as a further indication for the existence of an electron-hole liquid in CdSe at these excitation densities. 相似文献
39.
E. Best H. K. Kugler C. Mahr E. Gruner H. Zimmermann G. Manecke P. Kratochvíl G. Koßmehl G. Ebert K. Koeber W. Ried W. -D. Heine K. L. Wolf A. Warner F. C. Goodrich D. Koschel W. Schermann J. Sunkel P. Moritz A. Sippel G. Naeser D. Hintze W. Naegele 《Colloid and polymer science》1968,226(2):163-180
Ohne Zusammenfassung 相似文献
40.