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91.
The first diastereoisomeric mixture of an inherently chiral uranyl-salophen complex was prepared using (S)-naproxen as a chiral derivatizing agent. Slow crystallization from diisopropyl ether-chloroform afforded one pure diastereoisomer in 45% yield. Kinetic studies allowed the determination of the epimerization rate. [reaction--see text] 相似文献
92.
Solution and Solid‐State Studies on the Halide Binding Affinity of Perfluorophenyl‐Armed Uranyl–Salophen Receptors Enhanced by Anion–π Interactions 下载免费PDF全文
Luca Leoni Dr. Rakesh Puttreddy Dr. Ondřej Jurček Andrea Mele Dr. Ilaria Giannicchi Dr. Francesco Yafteh Mihan Prof. Kari Rissanen Prof. Antonella Dalla Cort 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(52):18714-18717
The enhancement of the binding between halide anions and a Lewis acidic uranyl–salophen receptor has been achieved by the introduction of pendant electron‐deficient arene units into the receptor skeleton. The association and the occurrence of the elusive anion–π interaction with halide anions (as tetrabutylammonium salts) have been demonstrated in solution and in the solid state, providing unambiguous evidence on the interplay of the concerted interactions responsible for the anion binding. 相似文献
93.
94.
M. Dalla Riva J. Morais P. Musolino 《Mathematical Methods in the Applied Sciences》2013,36(12):1569-1582
The purpose of this paper is to construct a family of fundamental solutions for elliptic partial differential operators with quaternion constant coefficients. The elements of such family are expressed by means of functions, which depend jointly real analytically on the coefficients of the operators and on the spatial variable. We show some regularity properties in the frame of Schauder spaces for the corresponding single layer potentials. Ultimately, we exploit our construction by showing a real analyticity result for perturbations of the layer potentials corresponding to complex elliptic partial differential operators of order two. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
95.
Julien Gasnot Clment Botella Sbastien Comesse Sami Lakhdar Carole Alayrac Annie‐Claude Gaumont Vincent Dalla Catherine Taillier 《Angewandte Chemie (International ed. in English)》2020,59(29):11769-11773
Advances in the field of phosphorus chemistry are documented, by revealing the synthetic utility of previously underutilized quaternary phosphiranium salts (QPrS) as three‐chain‐atom electrophilic building blocks. Notably, control of their challenging C‐centered electrophilicity is disclosed with an expedient synthesis of tertiary β‐anilino phosphines as a proof‐of‐concept. 相似文献
96.
L. Dalla D. G. Larman P. Mani-Levitska C. Zong 《Discrete and Computational Geometry》2000,24(2-3):267-278
Besides determining the exact blocking numbers of cubes and balls, a conditional lower bound for the blocking numbers of
convex bodies is achieved. In addition, several open problems are proposed.
Received December 11, 1998, and in revised form October 5, 1999. 相似文献
97.
Antonella Dalla Cort 《合成通讯》2013,43(5):757-760
Cleavage of silyl ethers can be efficiently effected using FeCl3, SnCl2, Cu(NO3)2 and Ce(NO3)3 at room temperature. 相似文献
98.
99.
Roberta Citro Emanuele G. Dalla Torre Luca D’Alessio Anatoli Polkovnikov Mehrtash Babadi Takashi Oka Eugene Demler 《Annals of Physics》2015
We consider a many-body generalization of the Kapitza pendulum: the periodically-driven sine–Gordon model. We show that this interacting system is dynamically stable to periodic drives with finite frequency and amplitude. This finding is in contrast to the common belief that periodically-driven unbounded interacting systems should always tend to an absorbing infinite-temperature state. The transition to an unstable absorbing state is described by a change in the sign of the kinetic term in the Floquet Hamiltonian and controlled by the short-wavelength degrees of freedom. We investigate the stability phase diagram through an analytic high-frequency expansion, a self-consistent variational approach, and a numeric semiclassical calculation. Classical and quantum experiments are proposed to verify the validity of our results. 相似文献
100.
Evidence for PSII donor-side damage and photoinhibition induced by cadmium treatment on rice (Oryza sativa L.) 总被引:2,自引:0,他引:2
Pagliano C Raviolo M Dalla Vecchia F Gabbrielli R Gonnelli C Rascio N Barbato R La Rocca N 《Journal of photochemistry and photobiology. B, Biology》2006,84(1):70-78
The effects of cadmium (from 7.5 to 75 microM) on chloroplasts of rice were studied at the structural and biochemical level. Loss of pigments, reduction of thylakoids and decrease in oxygen evolution and Fv/Fm ratio occur in leaves following cadmium treatment. However, the amount of photosystem II reaction center proteins and that of its light harvesting complex is not affected, indicating that cadmium does not adversely influence the structural organization of this photosystem. In thylakoids isolated from cadmium-treated plants a loss in the capability to reduce 2,6-dichlorophenolindophenol is observed, which is partially restored if diphenylcarbazide is used as an electron donor, indicating that cadmium affects water splitting activity. In thylakoids isolated from control plants and treated with cadmium, diphenylcarbazide preserves most of the photosystem II activity lost after incubation with cadmium; most of the S(2) multiline electron paramagnetic resonance signal from the manganese cluster is lost, whereas the TyrD(+) and other signals are retained. Light-induced photosystem II damage, in vitro, is promoted by Cd-treatment as deduced from the mobility shift of the D1 protein observed by immunoblot. 相似文献