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  • 1
    Electronic Resource
    Electronic Resource
    Dependence of metal ion complexation and intermolecular aggregation on photoinduced geometric isomerism in a crown ether styryl dye (1992)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 6381-6385 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00042a013
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  • 2
    Electronic Resource
    Electronic Resource
    Unstrained epitaxial InxGa1−x As films obtained on porous GaAs (1999)
    Springer
    Technical physics letters 25 (1999), S. 852-854 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Epitaxial layers of InGaAs solid solutions were grown on porous GaAs(100) substrates by liquid-phase epitaxy. A comparison between the compositions and thicknesses of these epitaxial layers with those of layers obtained under the same conditions on normal monolithic GaAs substrates suggests that the crystallization of epitaxial layers on porous substrates may be considered as the growth of free unstrained films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1262659
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  • 3
    Electronic Resource
    Electronic Resource
    Crown-containing styryl dyes (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 1385-1389 
    Details
    ISSN: 1573-9171
    Keywords: crown-containing styryl dyes ; complexes with Mg2+ ; photocyclodimerization ; cyclobutane derivatives ; 1H and13C NMR spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Styryl dyes containing a crown ether group and a heteroaromatic moiety with a sulfoalkylN-substituent (1a,b) undergo photocyclodimerization in acetonitrile in the presence of Mg(ClO4)2 to give only the typeA isomer of cyclobutane derivative (2a,b). The photochemical regio- and stereoselectivity of the cycloaddition is explained by self-organization of thetrans-isomers of the styryl dyes upon complexation with the Mg2+ cations into dimers with a fixed mutual arrangement of multiple bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00699938
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  • 4
    Electronic Resource
    Electronic Resource
    The synthesis and properties of some di-N-substituted amidophosphates (1960)
    Springer
    Russian chemical bulletin 9 (1960), S. 1846-1850 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 1. In the search for physiologically active compounds we have synthesized di-N-substituted amido(thio)phosphates $$(C_2 H_5 O)_2 \begin{array}{*{20}c} P \\ \parallel \\ {O(S)} \\ \end{array} N\begin{array}{*{20}c} {P(OR)_2 } \hfill \\ / \hfill \\ \backslash \hfill \\ {CH_2 COOC_2 H_5 } \hfill \\ \end{array} $$ by the reaction of the corresponding dialkylchlorophosphites (RO)2PCl with the N-ethylcarboxymethylamide of diethyl-(thio)phosphoric acids $$(C_2 H_5 O)_2 \begin{array}{*{20}c} P \\ \parallel \\ {O(S)} \\ \end{array} NHCH_2 COOC_2 H_5 $$ 2. We have studied the reaction of addition of sulfur to the resulting compounds and their isomerization into derivatives of alkylphosphonic acids under the influence of alkyl halides. 3. By the action of diethylphosphorous acid chloride on ethyl glycinate we have obtained mono- and disubstituted amides of diethylphosphorous acid (C2H5O)2PNHCH2COOC2H5; [(C2H2P]2NCH2COOC2H5. 4. By the reaction of alkoxydichlorophosphites with N-ethylcarboxymethylamides of diethylphosphoric acid we have synthesized derivatives with three atoms of phosphorus. $$ROP\left[ {N\begin{array}{*{20}c} {PO(OC_2 H_5 )_2 } \hfill \\ / \hfill \\ \backslash \hfill \\ {CH_2 COOC_2 H_5 } \hfill \\ \end{array} } \right]_2 $$
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00907743
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  • 5
    Electronic Resource
    Electronic Resource
    Novel synthesis of benzocrown ethers formylated in the benzene ring (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 960-961 
    Details
    ISSN: 1573-9171
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00698974
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  • 6
    Electronic Resource
    Electronic Resource
    Crown-containing styryl dyes (1995)
    Springer
    Russian chemical bulletin 44 (1995), S. 124-130 
    Details
    ISSN: 1573-9171
    Keywords: crown-containing styryl dyes, photoisomerization, complexation ; lectronic absorption spectra ; fluorescence spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract New crown ether styryl dyes containing various heterocyclic moieties and substituents were synthesized. Thecis andtrans isomers of crown ether styryl dyes and their complexes with metal cations were characterized by their absorption and fluorescence spectra. Based on an analysis of the spectral parameters and the shifts of the absorption and fluorescence maxima upon photoisomerization and complexation, the effects of the nature and structure of the heterocyclic moiety on the photochromism of styryl ionophores were revealed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696972
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  • 7
    Electronic Resource
    Electronic Resource
    Crown ether styryl dyes (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 564-572 
    Details
    ISSN: 1573-9171
    Keywords: crown ether styryl dyes ; Mg2+, Ca2+, and Ba2+ complexes ; stability constants ; dimerization constant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The stoichiometry of complexation of crown ether styryl dyes with Mg2+, Ca2+, and Ba2+ ions and the dependence of the stability constants of these complexes on the length of theN-sulfoalkyl substituent were investigated. Introduction of a terminal sulfo group into theN-ethyl substituent had but a small effect on the stability constant for the complexes with 1 : I stoichiometry. Increase in the length of theN-substituent by one or two methylene groups resulted in a jumpwise rise of this constant. The effect observed was attributed to the formation of the intramolecular ion pair. The dimerization constant for Mg2+ complexes increased dramatically when passing from the sulfopropylN-substituent to the sulfobutyl one. The increase in the constant results from the decrease in steric strains in the dimeric complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435783
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  • 8
    Electronic Resource
    Electronic Resource
    Macrocycle opening in crown ethers (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 648-653 
    Details
    ISSN: 1573-9171
    Keywords: 4′-formylbenzocrown ethers ; macrocycle opening ; alkylamines ; podands ; complex formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Macrocycle opening in derivatives of benzocrown ethers under the action of amines is affected by the nature of the heteroatoms in the macrocycle, the nature of the functional group in the benzene ring of the crown ether, and the length, branching, and number of hydrocarbon radicals at the amine nitrogen atom. A distinguishing feature of this reaction is the template effect of MeNH3 +, Me2NH2 +, Na+, and K+ ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435799
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  • 9
    Electronic Resource
    Electronic Resource
    Crown ether styryl dyes (1996)
    Springer
    Russian chemical bulletin 45 (1996), S. 654-661 
    Details
    ISSN: 1573-9171
    Keywords: crown ether styryl dyes ; synthesis ; complexation ; anion-“capped” complexes ; [2+2] photocycloaddition ; cyclobutane derivatives ; 1H NMR spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract New crown ether styryl dyes (trans-1c,d) containing the 18-crown-6 ether fragment were synthesized. Interaction oftrans-1c,d dyes, as well as their analogs,trans-1a,b containing the 15-crown-5 ether fragment, with Ca(ClO4)2 in MeCN afforded supramolecular structures (dimeric complexes). Competing reactions,trans-cis-photoisomerization with the formation of anion-“capped” complexes ofcis-1a—d and [2+2] autophotocycloaddition with the formation of cyclobutane derivatives8a—d and9c, were observed on photolysis of solutions of complexes oftrans-1a—d with Ca2+. Preorganization oftrans-isomers in dimeric complexes with Ca2+ determined the regio- and stereoselectivity of each of the two directions of the photocycloaddition and the efficiency of the reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435800
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  • 10
    Electronic Resource
    Electronic Resource
    Cooperative Interactions in Photosensitized Modification of DNA with Oligonucleotide-derived Binary Reagents (2000)
    Springer
    Molecular biology 34 (2000), S. 814-822 
    Details
    ISSN: 1608-3245
    Keywords: DNA ; kinetics ; oligonucleotide derivatives ; photomodification ; sensitization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Quantitative characteristics of thermodynamic and kinetic cooperativity arising in the process of photomodification of a single-stranded DNA fragment with binary systems of oligonucleotide conjugates forming an active site on the target were studied. Oligonucleotides of the binary system were complementary to adjacent segments of the DNA target, and contained arylazide (X) and perylene (S) residues covalently attached to their terminal phosphates. Upon irradiation at the perylene absorption wavelength, the target was modified by the arylazide residue, which was activated owing to the contiguity with the sensitizing perylene group in the tandem complex. Basing on the kinetic data, the constants of association of both derivatives of oligonucleotides with the target were determined: K x = 1.13 · 106 M–1, K s = 1.49 · 104 M–1. It was determined that association of both oligonucleotides with the target proceeded with a positive cooperativity characterized by parameter α = 45. The kinetic cooperativity parameter β was found to be approximately equal to 200; this characterized the acceleration of target modification in complex with the binary reagent versus that in the absence of sensitizer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026619607955
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