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281.
V. L. Ivanov V. A. Roznyatovskii N. N. Zemlyanskii I. V. Borisova Yu. A. Ustynyuk A. L. Buchachenko 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2006,80(4):626-629
9-Trimethylstannylanthracene (1) was synthesized and its photolysis by 365-nm light was studied. In aprotic solvents, the dimerization of 1 involves positions 9 and 10 and yields a head-to-tail dimer. The main route of the photolysis of 1 in alcohols is the cleavage of the C-Sn bond with the formation of anthracene. The quantum yields of the photoreaction and the lifetimes and quantum yields of 1 fluorescence were determined. 相似文献
282.
A new rational strategy for assembling highly selective neutral macrocyclic anionic receptors proposed by the authors is considered.
The strategy includes preliminary theoretical modeling of supramolecular complexes, analysis of synthetic paths for receptor
preparation, selection and synthesis of building blocks followed by their cyclocondensation under thermo-dynamic control in
the presence of acid corresponding to the target template anion, which provides anion-induced combinatorial selection of the
macrocyclic ligand in the emerging dynamic combinatorial library. Analysis of the properties of the obtained anion receptors
showed that the number of hydrogen bonds formed between the receptor and the guest anion mainly determines the binding energy.
The receptor selectivity for a particular anion is determined by the nature of coordination sites, their geometry in the macrocyclic
cavity, and the overall conformation rigidity of the macrocycle. Using the developed strategy and novel synthetic approaches,
a large series of highly selective anion receptors with record binding constants (up to 10p7 L molp-1 in both highly and weakly solvating media) was constructed and the structures of the host—guest complexes were studied in
detail by both experimental and theoretical methods 相似文献
283.
I. D. Grishin V. V. Krivykh A. A. Shchepalov E. S. Taits N. A. Ustynyuk D. F. Grishin 《Russian Chemical Bulletin》2009,58(9):1866-1871
Radical polymerization of methyl methacrylate and styrene in the presence of several cyclopentadienyl manganese dicarbonyl
derivatives was studied. The influence of the molecular structure of the complexes on the molecular-weight characteristics
of the macromolecules was estimated. Quantum chemical modeling of the initial polymerization step with participation of these
complexes was performed. 相似文献