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Russian Chemical Bulletin - Two new metal-organic frameworks of composition [Eu2(phen)2Cl2(chdc)2] ? 1.1DMF? ?0.7diox (1?1.1DMF?0.7diox, phen is 1,10-phenanthroline,... 相似文献
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E. N. Chulakov G. L. Levit A. A. Tumashov N. P. Lugovskaya N. B. Remezovskaya A. Yu. Maksimov V. A. Demakov V. P. Krasnov 《Russian Chemical Bulletin》2015,64(5):1097-1099
New strains of Rhodococcus erythropolis 25 and Microbacterium paraoxydans 20-11c actinobacteria were used to obtain (S)-7,8-difluoro-3,4-dihydro-3-methyl-2H-[1,4]benzoxazine (99.6% ee) by enantioselective microbial hydrolysis of the corresponding racemic N-acetyl derivative. 相似文献
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Experimental concentration profiles of As ions in a silicon substrate at temperatures of 20, 600, and 1050°C and ion current of 40 μA/cm2, as well as at 1050°C and 10 μA/cm2, are presented. On the basis of our and previously published experimental data, the process of radiation-stimulated ionic diffusion and self-diffusion in silicon is simulated. A number of interesting dependences, which are discussed in the conclusion of this study, are obtained. 相似文献
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Abasheeva K. D. Demakov P. A. Dybtsev D. N. Fedin V. P. 《Journal of Structural Chemistry》2022,63(8):1349-1357
Journal of Structural Chemistry - Four cobalt(II) and zinc(II) cationic metal-organic frameworks (MOFs) based on bridging 1,4-diazabicyclo[2.2.2]octane N,N′-dioxide (odabco) are synthesized.... 相似文献
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Pavel A. Demakov Alena A. Vasileva Sergey S. Volynkin Alexey A. Ryadun Denis G. Samsonenko Vladimir P. Fedin Danil N. Dybtsev 《Molecules (Basel, Switzerland)》2021,26(17)
Three isostructural metal–organic frameworks ([Ln2(phen)2(NO3)2(chdc)2]·2DMF (Ln3+ = Y3+ for 1, Eu3+ for 2 or Tb3+ for 3; phen = 1,10-phenanthroline; H2chdc = trans-1,4-cyclohexanedicarboxylic acid) were synthesized and characterized. The compounds are based on a binuclear block {M2(phen)2(NO3)2(OOCR)4} assembled into a two-dime nsional square-grid network containing tetragonal channels with 26% total solvent-accessible volume. Yttrium (1)-, europium (2)- and terbium (3)-based structures emit in the blue, red and green regions, respectively, representing the basic colors of the standard RGB matrix. A doping of Eu3+ and/or Tb3+ centers into the Y3+-based phase led to mixed-metal compositions with tunable emission color and high quantum yields (QY) up to 84%. The bright luminescence of a suspension of microcrystalline 3 in DMF (QY = 78%) is effectively quenched by diluted cinnamaldehyde (cinnamal) solutions at millimolar concentrations, suggesting a convenient and analytically viable sensing method for this important chemical. 相似文献
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Yudina Yu. A. Samsonova A. M. Bolotov V. A. Demakov P. A. Samsonenko D. G. Fedin V. P. Dybtsev D. N. 《Journal of Structural Chemistry》2021,62(10):1599-1606
Journal of Structural Chemistry - Three novel metal-organic coordination polymers based on sulfur-containing thieno[3,2-b]thiophene-2,5-dicarboxylic (trans-H2ttdc) and... 相似文献
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A phenomenon of crystalline sponge is represented by guest-dependent structural fluidity of the host polymeric lattice in highly crystalline sorbents, such as metal-organic frameworks, driven by multiple weak intermolecular interactions. Such induced fitting in MOFs is a valuable property in selective adsorption, guest determination by single-crystal XRD and in-situ structural analysis under external stimuli. In this work, a porous three-dimensional metal-organic framework [Eu2(DMF)4(ttdc)3]·4.45DMF (1DMF; DMF = N,N-dimethylformamide, ttdc2– = trans-thienothiophenedicarboxylate anion) was applied as a crystalline sponge bearing luminescent functionality to couple its sensing properties with direct structural determination of the adsorbed molecules. As a result, the paper discusses crystal structures and luminescent properties for the successfully obtained new adducts with the crystallographic formulae [Eu2(DMSO)4(ttdc)3]·2.5DMSO·2.2H2O (1DMSO; DMSO = dimethylsulfoxide), [Eu2(DMF)4(ttdc)3]·3phet (1phet; phet = phenylethanal) and [Eu2(DMF)3.5(cin)0.5(ttdc)3]·1.64cin (1cin; cin = trans-cinnamaldehyde). As a result of inclusion of DMSO into 1, a slight increase in the quantum yield and excited state phosphorescence lifetime was observed, while the adsorption of phet leads to a considerable (up to three times) decrease in the corresponding values. The incorporation of cinnamal results in a full quenching of QY, from 20% down to zero, and a more than order of magnitude diminishing of the excited state lifetime compared to the initial 1DMF. The effective sensing of cinnamal was explained from the structural point of view by its direct coordination to the Eu3+ emitter, as well as by multiple weak intermolecular interactions with ttdc antenna ligand, both capable of enhancing the non-radiative energy dissipation. 相似文献
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Demakov P. A. Samsonenko D. G. Dybtsev D. N. Fedin V. P. 《Russian Chemical Bulletin》2022,71(1):83-90
Russian Chemical Bulletin - Four zinc metal-organic frameworks (MOFs) with 1,4-diazabicyclo[2.2.2]octane N,N′-dioxide (odabco) as a bridging ligand were synthesized by varying the solvent and... 相似文献
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