共查询到20条相似文献,搜索用时 0 毫秒
1.
Miyata K Mineo R Tamamushi R Mizuta M Ohkubo A Taguchi H Seio K Santa T Sekine M 《The Journal of organic chemistry》2007,72(1):102-108
New bi- and tricyclic deoxycytidine derivatives (dChpd, dCmpp, dCtpp, dCppp) were synthesized as analogues of a fluorescent nucleoside, dChpp, previously reported. The carbamoyl group of dChpd and the 5-position of the cytosine ring are bridged via an ethylene linker so that the modified group forms a nonplanar structure with the cytosine ring. The fluorescent study of dChpd indicated that the coplanar structure between the carbamoyl group and the cytosine ring is of importance. N-Methylation of the carbamoyl group (dCmpp) weakened the intensity of the fluorescence of dChpp, and the derivative (dCtpp), which had a thiocarbamoyl group, lost its fluorescent property. Moreover, addition of a pyrrolo-ring (dCppp) to dChpp enhanced the intensity of fluorescence, and an emission light was observed with a marked Stokes shift of 120 nm. 相似文献
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A new naphthalimide derivative of calix[4]arene was synthesized as a highly selective fluorescent compound for Cu2+ among the selected metal ions. This compound was examined for its fluorescent properties toward different metal ions (Na+, Li+, Mg2+, Ni2+, Ba2+, Ca2+, Cu2+, Pb2+, Zn2+) and anions (F?, Cl?, Br?, , , I?, , CH3COO?) by UV, NMR and fluorescence spectroscopy. 相似文献
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A new, highly fluorescent (Phi(F) > or = 0.8) chromophore has been synthesized in one step from dipyrrinones by reaction with N,N-carbonyldiimidazole to form the 3H,5H-dipyrrolo[1,2-c:2',1'-f]pyrimidine-3,5-dione nucleus. 相似文献
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Zhan-Xian Li 《Tetrahedron letters》2007,48(43):7675-7679
A solvent-sensitive highly fluorescent compound, N-[2-(1′,3′,4′,4′,5′,5′-hexafluorocyclopentenyl)]-4-(5-methoxy-thiazolyl)pyridine (1D) was synthesized as an unexpected product of the reaction of 4-bromo-5-methoxy-2-(4-pyridyl)thiazole (1B) with perfluorocyclopentene in the presence of n-BuLi. Primary mechanism of this reaction was proposed, and the photophysical properties of 1D in different solvents were studied. 相似文献
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Zelga K Leszczyński M Justyniak I Kornowicz A Cabaj M Wheatley AE Lewiński J 《Dalton transactions (Cambridge, England : 2003)》2012,41(19):5934-5938
An equimolar reaction between ZnEt(2) and 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine (hppH) results in the formation of EtZn(hpp) (1) which crystallizes as a trinuclear agglomerate with the guanidinate ligands spanning 4-coordinate Zn centers. Exposure of a pre-formed THF solution of 1 to undried air leads to a ZnO-incorporating derivative 1(4)·ZnO, while an analogous experiment with CH(2)Cl(2) as solvent leads to a novel tetranuclear mixed aggregate formulated as [EtOZn(hpp)](2)[ClZn(hpp)](2) (2). The composition of 2 indicates that its formation proceeds via a complex multi-step reaction route that involves not only the oxygenation of ZnEt moieties, but also the activation of CH(2)Cl(2), causing the transfer of a chloride anion to the Zn center. Compounds were characterized by (1)H NMR spectroscopy and single-crystal X-ray diffraction analysis. 相似文献
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Dorota Prukala 《Journal of heterocyclic chemistry》2006,43(2):337-344
Sixteen new fluorescent N4‐(E)‐stilbenyloxyalkylcarbonyl‐cytosines 9–16 and N4‐(E)‐stilbenyloxyalkylcarbonyl‐1‐methylcytosines 17–24 have been synthesized. The differences in 1H and 13C NMR spectra in two solvents (DMSO and TFA) have been pointed out and discussed. Assignment of the signals in the spectra of the compounds 9–24 in NMR in DMSO‐d6 solutions has been made the basis of the homonuclear (COSY) and heteronuclear (HETCOR) spectra. The effect of the substituent (Cl, Br, NO2) on the stilbene moiety on the fluorescence spectrum of each compound has been discussed. 相似文献
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设计并合成了下沿含柠檬醛片段的新型杯[4]芳烃衍生物,经1H NMR、MS和元素分析等表征确证其结构,测定了新型杯[4]芳烃衍生物对金属阳离子和氨基酸分子的两相萃取性能,结果表明主体分子通过多官能团的协同作用具有较好的配位性能。 相似文献
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A new chemosensor was synthesized by the alkylation of p-tert-butyl-calix[4]arene with three N,N-diethylacetamide groups and one methyl 3-ethoxy-naphthalene-2-carboxylate, which exhibited highly selective fluorescent response to Pb2+ over alkali, alkali earth metal ions and some transition metal ions in CH3CN-H2O. 相似文献
9.
Synthesis and fluorescent properties of some new unsymmetricbis-benzothiazolyl furans and thiophenes
L. Racane V. Tralić-Kulenović G. Karminski-Zamola L. Fišer-Jakić 《Monatshefte für Chemie / Chemical Monthly》1995,126(12):1375-1381
Summary Some newmono- andbis-benzothiazolyl compounds with furan or thiophene nuclei were synthesized by multistep reactions from the corresponding furan and thiophene aldehydes. The data obtained from emission spectra show a large influence of the benzothiazole rings on the relative quantum efficiency of the compounds under investigation.
Synthese und Fluoreszenzeigenschaften von neuen unsymmetrischenbis-Benzothiazolylfuranen und thiophenen
Zusammenfassung Einige neuebis-Benzothiazolylverbindungen mit einem Furan- bzw. Thiophenenring wurden in einer mehrstufigen Reaktion dargestellt. Die Fluoreszenzdaten der untersuchten Verbindungen zeigen einen großen Einfluß der Benzothiazolringe auf die relative Fluoreszenzquantenausbeute.相似文献
10.
In this paper, we present a synthetic approach to the first hexapyrenylbenzene starting from 4,5,9,10-tetrahydropyrene. Absorption and fluorescence spectroscopic measurements show strong and red-shifted fluorescence both from locally excited pyrene states and from the excitonic manifold of the aggregate. [structure: see text] 相似文献
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Ali Ali Khalaf Ahmed Kamal El-Shafei Ahmed Mahmoud El-Sayed 《Journal of heterocyclic chemistry》1982,19(3):609-612
2,6-Diarylidenecyclohexanones react with hydrazine to give the corresponding bicyclic pyrazolines. The synthesis of a series of twenty eight substituted pyrazolines is described. The structure of all products was confirmed by microanalyses, ir and nmr data. 相似文献
14.
Ju Wang Zheng-Yin Yang Xu-Yang Yi Bao-Dui Wang 《Journal of photochemistry and photobiology. A, Chemistry》2009,201(2-3):183-190
A new chromone derivative (6-ethoxy chromone-3-carbaldehyde benzoyl hydrazone) ligand (L) and its two transition metal complexes [Zn(II) complex and Ni(II) complex] have been prepared and characterized on the basis of elemental analysis, molar conductivity, mass spectra, UV–vis spectra and IR spectra. The Zn(II) complex exhibits light blue fluorescence under UV light, and the fluorescent properties of Zn(II) complex and the ligand in solid state and in different solutions (MeOH, DMF, THF and H2O) were investigated. In addition, the interactions of the Zn(II) complex and the ligand with calf thymus DNA were investigated using UV–vis absorption, fluorescence, circular dichroic spectral methods and viscosity measurement. It was founded that both two compounds, especially the Zn(II) complex, strongly bind with calf thymus DNA, presumably via an intercalation mechanism. 相似文献
15.
《Analytica chimica acta》1987,203(1):85-89
The fluorescent 14-crown-4 derivative possesses a p-(1,8-naphthalenedicarboxi-mido) phenol moiety as the proton -dissociable fluorophore; its synthesis is described. Highly selective extraction of lithium is achieved with the crown ether, based on a proton/metal ion-exchange mechanism. Extraction is accompanied by significant changes in the absorption and fluorescence spectra of the organic phase. Extraction equilibrium constants for the lithium and sodium ions are evaluated, the Li+/Na+ selectivity ratio being 200; other alkali metal ions were not extracted. The Li+ extraction quenched the fluorescence intensity of the crown ether, in correlation with the initial cation concentration in the aqueous phase. 相似文献
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Crovetto L Rios R Alvarez-Pez JM Paredes JM Lozano-Velez P del Valle C Talavera EM 《The journal of physical chemistry. B》2008,112(33):10082-10085
The 2,5-dioxopyrrolidin-1-yl-4-(3-hydroxy-6-oxo-6H-xanthen-9-yl)-3-methylbenzoate has been synthesized as an amine-reactive derivative able to yield stable covalently labeled biopolymers. The new derivative has been used to label polyribocytidilic acid (5'), poly(C), amine residues. TG-II-poly(C) exhibits monoexponential decay at the physiological pH range. In addition, both steady-state fluorescence intensity and fluorescence decay are also sensitive to solution pH. The large decrease in steady-state fluorescence upon hybridization allows it to be used as a nucleic acid probe in a homogeneous assay format. In summary, we report an efficient synthesis to obtain labeled RNA from commercially available materials in excellent yields. 相似文献
18.
Liposomes incorporating fluorescent, metal-chelating lipids find applications in molecular recognition of peptides, 2D protein recrystallization, protein targeting, and biological sensing. It would be advantageous to combine the usefulness of polymerizable, metal-chelating lipids and fluorescent lipids. Herein, we report the synthesis and fluorescence properties of several fluorescent, polymerizable, metal-chelating lipids. They have been successfully incorporated into liposomes and then polymerized. These lipids can be used as membrane probes to study the polymerizable liposomes in the unpolymerized state and to investigate lipid redistribution during polymerization. In addition, if a luminescent metal ion (e.g., Eu(3+), Tb(3+), etc.) is used to complex the headgroup, the lipids can probe the membrane interior and exterior simultaneously. 相似文献
19.
Three convenient methods of reduction of the nitro group of 5-nitroimidazoles and 5-nitrothiazole that bear a diethylmethylene malonate group in an ortho-like position with respect to the nitro group and cyclization of the resulting amino derivatives are reported. These reactions afforded the target bicyclic 2-pyridones in good to excellent yields. 相似文献
20.
Sanjeev K. Dey Suchitra Datta David A. Lightner 《Monatshefte für Chemie / Chemical Monthly》2009,37(9):1171-1181