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H. İBRAHİM UĞRAŞ ÜMİT ÇAKIR AKIN AZİZOĞLU TURGUT KILIÇ ÇAKIL ERK 《Journal of inclusion phenomena and macrocyclic chemistry》2006,55(1-2):159-165
Hexadecanoyl, dihexadecanoyl, dioctadecaneoyl, di-10-undecenoyl, and dicis-9-octadecenoyl derivatives of benzo[18]crown-6, dibenzo[18]crown-6 and dibenzo[24]-8 were synthesized by the condensation of carboxylic acids (palmitic, stearic, oleic and undecenoic acid) with benzo and dibenzo crown ethers in the presence of zinc chloride. The extraction equilibrium constants of such macrocyclic ethers with long side chains were estimated using chloroform/water and dichloromethane/water membranes transfer of Na-PAR (4-(2-pyridylazo)-resorcinol mono sodium monohydrate) with UV–Vis spectroscopy. It was found that they were in the range of 10.88–11.71 in dichloromethane and 8.04–11.77 in chloroform. These results actually show that the Na+ binding effect of macrocyclic ethers depends on the type and the length of side chains. The geometrical properties of the molecules were studied employing semi-empirical calculations by simulated annealing technique. The frontier molecular orbital energies and dipole moments were also examined. The biological activity results showed that the synthesized crown ethers have no activity against the studied microorganisms. 相似文献
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D. V. Kuznetsov S. A. Andreev A. K. Tashmukhamedova 《Chemistry of Natural Compounds》2006,42(5):515-516
Diazonium salts were prepared by diazotization of 4′-amino-, 4′,4″-, and 4′,5″-diaminodibenzo-18-crown-6. Their coupling products
with kojic acid (5-hydroxy-2-hydroxymethyl-γ-pyrone) were synthesized for the first time: 4′-(6-aza-5-hydroxy-2-hydroxymethyl-γ-pyronyl)-, 4′,4″-di-(6-aza-5-hydroxy-2-hydroxymethyl-γ-pyronyl)-, and 4′,5″-di-(6-aza-5-hydroxy-2-hydroxymethyl-γ-pyronyl)-dibenzo-18-crown-6.
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Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 415–416, September–October, 2006. 相似文献
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A. N. Chekhlov 《Russian Journal of Inorganic Chemistry》2009,54(3):467-471
A new compound, dibenzo-18-crown-6 diaqua(dibenzo-18-crown-6)potassium triiodide [K(Db18C6)(H2O)2)+ · I3− · Db18C6 (I), is synthesized and studied by X-ray crystallography. The crystals of compound I are orthorhombic: a = 22.065 ?, b = 22.140 ?, c = 9.433 ?, Z = 4, space group Pccn. Structure I is solved by a direct method and refined by the full-matrix least-squares method in the anisotropic approximation
to R = 0.098 for all 5974 unique reflections. Structure I contains the following asymmetric units: a half of the I3− centrosymmetric anion and two halves of the mixed equally average [K(Db18C6)(H2O)2]+ host—guest complex cation (a) and a free Db18C6 molecule, each stacked on the axes 2 of the perpendicularly averaged plane
of the eighteen-membered macroheterocycle. In complex I, both Db18C6 molecules (a and b) have a “butterfly” conformation with
approximate symmetry C
2v
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Original Russian Text ? A.N. Chekhlov, 2009, published in Zhurnal Neorganicheskoi Khimii, 2009, Vol. 54, No. 3, pp. 516–520. 相似文献
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Andreev S. A. Grebenyuk A. D. Tyshchenko A. A. Tashmukhamedova A. K. 《Russian Journal of Organic Chemistry》2001,37(10):1514-1516
Russian Journal of Organic Chemistry - 相似文献
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研究一种方法以测定二苯并-18-冠-6在氯仿中与碱金属苦味酸盐相互作用的若干参数。这些参数是:络合物的无限稀释摩尔电导 A_0,络合物的解离常数 K_d(或 k_d),络合物中冠醚与盐的分子比,冠醚对苦味酸盐的络合常数 K_c(或 k_c),以及冠醚存在下苦味酸盐紧密离子对的饱和浓度[MA]等。 相似文献
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V. N. Glushko N. Yu. Sadovskaya L. I. Blokhina M. Yu. Zhila S. K. Belus’ E. S. Vashchenkova I. A. Shmelevaa 《Russian Journal of General Chemistry》2018,88(8):1595-1600
Specific features of the synthesis of polycyclic crown ethers dibenzo-18-crown-6 and dibenzo-24-crown-8 and their dinitro and diamino derivatives have been studied. A mixture of isomers of dibenzocrown ether derivatives was obtained and separated. The spectral and thermal characteristics of the synthesized compounds and the kinetics of synthesis of dibenzo-24-crown-8 by the two-component condensation of pyrocatechol with 1-chloro-2-[2-(2-chloroethoxy)ethoxy]ethane in an alcoholic medium in the presence of a KOH template agent were studied. 相似文献
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光敏离子载体丹磺酰基-单氮杂-18-冠-6的阳离子识别性质研究 总被引:1,自引:0,他引:1
以DNS-MAC(O5)为主体,利用其荧光性质研究了该物质在乙腈和水溶液中对阳离子Li^ ,Na^ ,K^ ,Mg^2 ,Ba^2 和Pb^2 的识别性质,由改进的B-H方程计算了主-客体配合物的稳定常数和识别敏感因子,结果表明,阳离子的电荷密度和阳离子与冠醚环空间的匹配程度是影响其识别性质的最重要的两个因素,DNS-MAC(O5)与阳离子配位时荧光光谱的变化主要受迭于阳离子的电荷密度,阳离子与DNS-MAC(O5)配位时不仅使这种离子载体的偶极矩增大,而且更有利于其实现光谱导分子内的电荷转移,所以激发态稳定性增加,荧光光谱红移,同时测定也该发光离子载体在乙腈和水中的荧光量子产率。 相似文献
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The acylation of dibenzo-18-crown-6 by lithium, sodium, and potassium acetates in polyphosphoric acid was studied. Complexes
of dibenzo-18-crown-6 with the acetates were obtained. A new method is proposed for the production of mono- and diacetyldibenzo-18-crown-6
by the reaction of dibenzo-18-crown-6 complexes with metal acetates in polyphosphoric acid.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1146–1149, August, 2005. 相似文献
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以顺(反)-4,4'-双[4-(4'-正烷氧基联苯基-4-羧基) 苯亚氨基] 二苯并-18-冠-6(I和II)为配体合成了2个系列席夫碱型液晶冠醚钾配合物,产率分别为85.5%~92.1%和88.7%~90.7%。配合物的结构通过元素分析、IR、UV-Vis和AAS等方法确证。液晶行为通过DSC、POM、XRD等方法表征。实验结果表明,所有配合物均具有热致液晶性,且随分子末端烷氧基碳原子数增加,其熔点和清亮点呈规律性变化。近晶相温度范围渐增,向列相温度范围递减。与配体相比,配合物液晶态温度范围变宽 相似文献
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以顺(反)-4,4′-双[4-(4′-正烷氧基联苯基-4-羧基)苯亚氨基]二苯并-18-冠-6(Ⅰ和Ⅱ)为配体合成了2种系列席夫碱型液晶冠醚钾配合物,产率分别为85.5%~92.1%和88.7%~90.7%。配合物的结构通过元素分析、IR、UV-Vis和AAS等测试技术确证。液晶行为通过DSC、POM、XRD等方法表征。实验结果表明,所有配合物均具有热致液晶性,且随分子末端烷氧基碳原子数增加,其熔点和清亮点呈规律性变化。近晶相温度范围渐增,向列相温度范围递减。与配体相比,配合物液晶态温度范围变宽。 相似文献
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K. M. Valikhanov M. G. Levkovich A. K. Tashmukhamedova 《Chemistry of Natural Compounds》2001,37(4):361-363
New derivatives of dibenzo-18-crown-6 were prepared by condensing 4,4(5)-dibenzo-18-crown-6-dicarboxylic acid dichloride with salsolidine and salsoline. The structures of these compounds were proved by PMR and IR spectral methods. 相似文献
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V. V. Nosyreva A. G. Mal’kina L. M. Sinegovskaya B. A. Trofimov 《Russian Journal of Organic Chemistry》2005,41(4):610-616
Dibenzo-18-crown-6 reacts with potassium hydroxide in methanol to give the C20H24O6 ⋅ KOH ⋅ MeOH complex which was characterized by the 1H NMR, UV, and IR spectra. Depending on the conditions, the reaction of the same compounds in toluene gave products with the compositions 4 C20H24O6 ⋅ KOH ⋅ 3 H2O (3 h, reflux) and 11C20H24O6 ⋅ KOH (1 h, 80°C, 1 h).__________Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 4, 2005, pp. 620–625.Original Russian Text Copyright © 2005 by Nosyreva, Mal’kina, Sinegovskaya, Trofimov. 相似文献
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Guseva E. V. Busygina T. E. Gracheva L. S. Polovnyak V. K. Khasanshin R. A. Yarkova E. G. Yusupov R. A. 《Russian Journal of General Chemistry》2001,71(2):217-221
The products of the reactions between potassium hexachloroplatinate {K2PtCl6} and 18-crown-6 or dibenzo-18-crown-6 in acetonitrile were studied. Pure crystalline compounds [2K·2(18-crown-6)· 2CH3CN]2+·[PtCl6]2-·2H2O, [2K·dibenzo-18-crown-6·CH3CN]2
+·[PtCl6]2
-, and [2K·dibenzo-18-crown-6·CH3CN]2
+·[Pt2Cl10]2
- were obtained. Physicochemical properties of these compounds were studied, and their near- and far-IR IR spectra and thermogravimetric curves were considered. The composition of the complexes is determined by metal:ligand molar ratio and crown ether nature. It was found that acetonitrile is coordinated via the nitrogen atom. 相似文献
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Photocured polymer electrolytes, applied onto a porous polypropylene separator, with conduction by lithium cations (1 × 10−4 S cm−1 at 20°C) are designed. The polymer is formed from a 1 : 1 mixture of oligourethane dimethacrylate and polypropylene glycol monomethacrylate, which are capable of undergoing polymerization via double bonds in a liquid organic electrolyte (0.5 M LiClO4) in a 1 : 1 mixture of propylene carbonate and dimethoxyethane. The polymer electrolyte comprises a polymer composition (20 wt %), a liquid electrolyte (78 wt %), and a photoinducer (2 wt %). Effect of insertion of dibenzo-18-crown-6 into the electrolyte on its electrochemical characteristics (on the electrolyte/Li interface) is investigated. Dependences of the bulk conductivity and exchange currents at the interface on the temperature and storage duration are studied at different crown ether contents.__________Translated from Elektrokhimiya, Vol. 41, No. 5, 2005, pp. 646–650.Original Russian Text Copyright © 2005 by Yarmolenko, Efimov. 相似文献
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U.Z. Mirkhodjaev V.A. Boldyrev O.V. Yarishkin B.A. Tashmukhamedov 《Journal of inclusion phenomena and macrocyclic chemistry》2005,53(3):191-196
Ca2+ permeable channels have been registered in bilayer membranes formed from phospholipids of sarcoma-45 and sarcocarcinoma Walker-256. On the basis of data obtained, it is supposed that the channels are proteins located in the plasmalemmal membrane of tumor cells. Diacetyl-dibenzo-18-crown-6 was found to suppress Ca2+ currents through the channels. In in vivo experiments diacetyl-dibenzo-18-crown-6 inhibited the sarcoma-45 and carcinosarcoma Walker-256 tumors growth, whereas divaleril-dibenzo-18-crown-6, which is known to be a Ca2+ ionophore, acted as a growth-stimulating agent. The mechanism of the tumor growth inhibition by diacetyl-dibenzo-18-crown-6 is supposed to consist in cytostatic action of the compound, presumably, by blocking Ca2+ channels of tumor cells. 相似文献