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1.
L. I. Belen'kii M. A. Cheskis V. P. Zvolinskii A. E. Obukhov 《Chemistry of Heterocyclic Compounds》1986,22(6):654-663
Syntheses of systems containing two oxazole rings [2-phenyl-, 2-(2-furyl)-, and 2-(2-thienyl)-2,5-bioxazoles, and 2,2-(2,5-furylene)bisoxazole] from aldehydes obtained by formylating 2-phenyl-, 2-(2-furyl)-, and 2-(2-thienyl)oxazole have been developed. Terephthalate and thiophen-2,5-dicarboxylate esters have been used to obtain 2,2-(1,4-phenylene)- and 2,2-(2,5-thienylene)bisoxazoles. The PMR, UV, and luminescence spectra of these systems have been examined, and quantum chemical calculations carried out in the PPP approximation.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 826–836, June, 1986. 相似文献
2.
Rozentsvet V. A. Kozlov V. G. Ziganshina E. F. Boreiko N. P. Khachaturov A. S. 《Russian Journal of Applied Chemistry》2009,82(1):148-152
Russian Journal of Applied Chemistry - The effect of the catalyst composition and temperature on the cationic polymerization of isoprene in the presence of the catalytic system... 相似文献
3.
Two new bisazomethine diols were prepared from terephthalaldehyde and aromatic or aliphatic aminoalcohols. The structure of the diols with bisazomethine moieties was confirmed by 1H-NMR, IR, UV spectroscopy and elemental analysis. Bisazomethine aliphatic diol exhibited a smectic phase that has been identified by means of polarizing microscopy and differential scanning calorimetry. By using these diols as partners in polyaddition reaction between poly(tetramethylene oxide)diol of 2000 average molecular weight, tolylene-2,4-diisocyanate (as 2,4- and 2,6-TDI, 80:20 v/v isomers mixture) and bisazomethine diol (1:3:2 molar ratio), two polyazomethine-urethanes were synthesized. Polyazomethine-urethanes with a higher concentration of poly-Schiff's base units were also obtained by reacting the above bisazomethine diols with the same diisocyanate (1:1 molar ratio). All polymers were characterized by viscometry, elemental analysis, IR, UV, 1H-NMR spectroscopy and TGA techniques. 相似文献
4.
Zh. I. Orlova L. Yu. Ukhin K. Yu. Suponitskii E. N. Shepelenko L. V. Belousova G. S. Borodkin O. S. Popova 《Russian Chemical Bulletin》2013,62(6):1409-1416
An acid-catalyzed reaction of 3-(2-aminophenylamino)-5,5-dimethylcyclohexen-1-one with isatines leads to the formation of the earlier undescribed 3,3-dimethyl-2,3,4,5,10,11-hexahydrospiro[1H-dibenzo[b,e][1,4]diazepine-11,3′-2H-indole]-1,2′-dione derivatives (6). Spiranes 6 upon heating undergo auto-redox rearrangement with disintegration to 3,3-dimethyl-1,2,3,4-tetrahydrophenazine and the corresponding oxindole. Crystals of four derivatives of compound 6 were studied by X-ray diffraction method. 相似文献
5.
6.
Shalabh Gupta 《Journal of solid state chemistry》2006,179(5):1318-1322
A new ternary antimonide SrLiSb has been synthesized and characterized using single-crystal X-ray studies. It is found to crystallize in the anti-PbCl2 structure type with orthorhombic cell (centrosymmetric S.G., Pnma; , , ) and is isostructural to its calcium analogue (CaLiSb). However, BaLiSb has been reported to crystallize in the hexagonal space group P63/mmc. As in the Ca and Ba analogues, antimony is present as isolated Sb3− ions making SrLiSb electron precise and hence is expected to behave as a classical Zintl compound. The magnetic susceptibility measurements show the diamagnetic nature and the conductivity is temperature independent, both verifying the classical Zintl nature of SrLiSb. 相似文献
7.
The crystal structure, phase relations and some physical properties of the binary zinc-rich phase RuZn3 are reported. The title compound is accessible via high-temperature reaction from the elements in the appropriate substance amount ratio. Its crystal structure was determined from a Rietveld profile fit to an X-ray diffractogram of pristine RuZn3 and confirmed by single-crystal X-ray structure analysis. The title compound adopts a tetragonal Al3Zr-type structure corresponding to an A2B2 anti-phase domain structure of the cubic AuCu3-type: a=376.82(3) pm, c=1554.78(13) pm, I4/mmm, Z=4, R(F)(all data)=0.0197, 153 unique reflections, 12 variables. The structure is discussed in the light of the Hume-Rothery concept. RuZn3 melts at 1373(2) K, is a moderate metallic conductor (rho(293 K)=6.2 mOmega cm) and exhibits basically temperature-independent paramagnetic properties. It coexists with Ru1-xZnx and RuZn6. 相似文献
8.
A new coordination polymer of terbium tartrate [Tb(H2O)3(C4H5O6)(C4H4O6)] has been synthesized and crystallizes in the polar space group P41 with cell constants a = 6.0415(9), b = 6.0415(9), c = 36.516(7) Å, V = 1332.8(4) Å3, Z = 4. The terbium(III) ion of title complex is nine-coordinate through oxygen donors. Four different coordination modes of tartrate occur. This Tb(III) complex exhibits a characteristic luminescence in the visible region upon excitation at 353 nm. The temperature-dependent magnetic properties of the Tb(III) complex were investigated in the temperature range of 2–300 K. Title compound exhibits significant ferroelectric properties at room temperature (remnant polarization 2P r = 0.160 μC cm?2, coercive field 2E c = 44.5 kV cm?1, saturation of the spontaneous polarization P s = 0.176 μC cm?2). 相似文献
9.
L. D. Popov S. A. Borodkin I. N. Shcherbakov Yu. N. Tkachenko V. A. Kogan 《Russian Journal of General Chemistry》2008,78(4):567-574
A series of new Schiff bases has been synthesized on the basis of (2-aminophenyl)triphenyl-phosphonium chloride and substituted salicylaldehydes. The structure of the prepared compounds has been established by means of IR, UV, and 1H NMR spectroscopy, as well as DFT B3LYP/6-31G(d,p) quantum-chemical simulation. The possible tautomerism and certain properties of the azomethines, including complex formation, have been studied. 相似文献
10.
《Journal of Coordination Chemistry》2012,65(17-18):1603-1609
Reaction of K3[Fe(CN)6], NiCl2 and diethylenetriamine (dien) resulted in the formation of a cyanide-containing heterometallic compound [Ni(dien)2]2[Fe(CN)6]·4H2O 1. The structure consists of two octahedral [Ni(dien)2]2+ cations, one octahedral [Fe(CN)6]4? anion and four crystallization water molecules, which are held together by hydrogen-bonding interactions. Its TG curve exhibits two stages of mass loss. Compound 1 in DMF solutions has a very strong third-order non-linear optical (NLO) behavior with an absorption coefficient and refractive index α2?=?1.10?×?10?11?m?w?1, n 2?=??3.05?×?10?19?m2?w?1, respectively, and third-order NLO susceptibility χ(3) 4.34?×?10?13?esu. 相似文献
11.
Yang T Pu S Fan C Liu G 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2008,70(5):1065-1072
A new unsymmetrical photochromic diarylethene, 1-(2-methyl-5-phenyl-3-thienyl)-2-[2-methyl-5-(3-trifluoromethylphenyl)-3-thienyl]perfluorocyclopentene (1a), was synthesized and its structure was determined by single-crystal X-ray diffraction analysis. Its optical and electrochemical properties, including photochromic reactivity both in solution and in the solid state (PMMA film and the single-crystalline phase), fluorescence and electrochemical properties were investigated in detail. The compound showed excellent photochromism even in the single-crystalline phase by photo-irradiation. In acetonitrile, the open-ring isomer of diarylethene 1 exhibited relatively strong fluorescence at 470nm when excited at 300nm, and its emission intensity decreased along with the photochromism upon irradiation with 313nm light. Its closed-ring isomer showed almost no fluorescence. The electrochemical properties of diarylethene were investigated by performing cyclic voltammetry experiment and its HOMO and LUMO energy level were calculated. 相似文献
12.
Semanti Basu Rama Acharyya William S. Sheldrick Heike Mayer-Figge Samaresh Bhattacharya 《Structural chemistry》2007,18(2):209-215
Reaction of thiosemicarbazones of salicylaldehyde and 2-hydroxyacetophenone (H2L1 and H2L2) with [Ir(PPh3)3Cl] affords complexes of type [Ir(PPh3)2(L)(H)] (L = L1 or L2) in ethanol. A similar reaction carried out in toluene affords the [Ir(PPh3)2(L)(H)] complexes along with complexes of type [Ir(PPh3)2(L)Cl], where a chloride is coordinated to iridium instead of the hydride. The structure of the [Ir(PPh3)2(L2)(H)] and [Ir(PPh3)2(L2)Cl] complexes has been determined by X-ray crystallography. Crystal data for [Ir(PPh3)2(L2)(H)]: space group, P21/c; crystal system, monoclinic; a=12.110(2) Å, b=17.983(4) Å, c=18.437(4) Å, β=103.42(3)°, Z=4; R 1=0.0591, wR 2=0.1107. Crystal data for [Ir(PPh3)2(L2)Cl]: space group, P21/c; crystal system, monoclinic; a=17.9374(11) Å, b=19.2570(10) Å, c=24.9135(16) Å, β=108.145(5)°, Z=4; R 1=0.0463, wR 2=0.0901. In all the complexes the thiosemicarbazones are coordinated to the metal center as dianionic tridentate O, N, S-donors and the two triphenylphosphines are trans. The complexes are diamagnetic (low-spin d? 6, S=0) and show intense MLCT transitions in the visible region. Cyclic voltammetry on all the [Ir(PPh3)2(L)(H)] and [Ir(PPh3)2(L)Cl] complexes shows a quasi-reversible Ir(III)–Ir(IV) oxidation within 0.55–0.78 V vs. SCE followed by an irreversible oxidation of the thiosemicarbazone within 0.91–1.27 V vs. SCE. An irreversible reduction of the thiosemicarbazone is also observed within ?1.10 to ?1.23 V vs. SCE. 相似文献
13.
Reaction of salicyldehyde thosemicarbazone (H2L1), 2-hydroxyacetophenone thiosemicarbazone (H2L2) and 2-hydroxynapthaldehyde thiosemicarbazone (H2L3) (general abbreviation H2L, where H2 stands for the two dissociable protons, one phenolic proton and one hydrazinic proton) with K2[PtCl4] afforded a family of polymeric complexes of type [{Pt(L)}n]. Reaction of the polymeric species with two monodentate ligands (D), viz. triphenylphosphine (PPh3) and 4-picoline (pic), yielded complexes of the type [Pt(L)(D)]. These mixed-ligand complexes were also obtained from the reaction of the thiosemicarbazones with [Pt(PPh3)2Cl2] and [Pt(pic)2Cl2]. The crystal structure of [Pt(PPh3)(L2)] has been determined. The thiosemicarbazone ligands are coordinated, via dissociation of the two protons, as dianionic tridentate O,N,S-donors. The [Pt(L)(D)] complexes show characteristic 1H NMR spectra and intense absorptions in the visible and ultraviolet region. They also fluoresce in the visible region at ambient temperature. 相似文献
14.
A nest-shaped cluster [(C4H9)4N]2[WOSe3Cu3Br1.67Cl1.33] (1) and a cage-shaped cluster [(C4H9)4N]3[WSe4Cu3Br2Cl2] (2) were synthesized and their structures were determined by single-crystal X-ray diffraction. It was found that cluster 1 showed better optical limiting properties under an 8 ns pulsed laser at 532 nm but poorer optical limiting properties under a 35 ps pulsed laser compared with its analogue [(C4H9)4N]2[MoOS3Cu3BrCl2]. The influence of the peripheral ligands of the cluster to the optical limiting properties was also discussed. 相似文献
15.
16.
Ya. L. Gol'dfarb é. G. Ostapenko V. G. Vinogradova A. N. Zverev A. V. Polyakov A. I. Yanovskii D. S. Yufit Yu. T. Struchkov 《Chemistry of Heterocyclic Compounds》1987,23(7):740-747
New Cu, Ni, Pb, Zn, Co. Fe, Mn, Sb, and Bi dithiocarbamates that include 2-thenyl and 2-furfuryl radicals were synthesized. The potentials of polarographic oxidation on a rotating platinum electrode were determined for them and for the previously synthesized N-substituted unsymmetrical dithiocarbamates of the same metals. The results of x-ray diffraction analysis of bis-(di-2-thenyldithiocarbamato)nickel(2+) are presented and discussed.Deceased.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 902–909, July, 1987. 相似文献
17.
In this study, a series of new 5-phenylazo-6-aminouracil dyes were prepared by linking m-,p-nitroaniline, m-,p-chloroaniline,
m-,p-anisidine, m-,p-toluidine, m-,p-cyanoaniline, p-ethoxyaniline, p-phenoxyaniline, p-ethylaniline, p-acetamidoaniline,
p-acetylaniline, p-carboxyaniline and aniline to 6-aminouracil. The prepared dyes were characterized by UV-vis, FT-IR, 1H NMR spectroscopic techniques and elemental analysis. The effect of acid and base upon the UV-vis spectra of these dyes were
investigated. In addition, the solvatochromic behaviors and substituent effects in various solvents were evaluated.
相似文献
18.
A new coordination polymer, [Cd(HMal)(Bipy)(H2O) · 2H2O (I) (H3Mal is malic acid, Bipy is 4,4′-bipyridine), has been synthesized from H3Mal and Bipy under hydrothermal conditions and characterized by elemental analysis, IR, TG, and single-crystal X-ray diffraction. The X-ray diffraction analysis reveals that I (C14H16N2O7Cd) crystallizes in the orthorhombic system, space group Ibam. The adjacent cadmium(II) atoms were first interconnected by the HMal ligands via carboxylate oxygen atoms and its adjacent hydroxyl group to generate an infinite zigzag [Cd(HMal)] n chain, which are further linked by Bipy ligands to form a 2D wavelike layer. Interestingly, the adjacent layers are further connected via hydrogen bonds, giving rise to a 3D porous framework with a cross-sectional area of 11.690 × 9.326 Å2. The unit cell parameters for I: a = 8,457(1), b = 22.030(7), c = 23.066(7) V = 4297(2) Å3, Z = 4. 相似文献
19.
《Journal of Coordination Chemistry》2012,65(14):1169-1176
A new oxamido-bridged trinuclear copper(II) complex [(CuL)2Cu](ClO4)2·0.5H2O (L?=?the dianion of 2,3-dioxo-5,6,14,15-dibenzo-7,13-bis(ethoxycarbonyl)-1,4,8,12-tetraazacyclotetradeca-7,12-diene) has been synthesized by self-assembly and characterized. X-ray diffraction analysis reveals that the title complex is monoclinic, space group P21, with a?=?16.213(5), b?=?9.811(3), c?=?18.802(6)?Å, β?=?96.790(5)°. The central copper(II) ion lies in a distorted octahedral environment. Terminal coppers have square pyramidal coordination geometry. Magnetic measurements show there is strong antiferromagnetic interaction between the central and the terminal Cu(II) ions. 相似文献
20.
Hisanori Yamane Ryota Yagi Akira Hosono Yuji Masubuchi 《Acta Crystallographica. Section C, Structural Chemistry》2019,75(6):702-706
A new quaternary oxide, BiGaTi4O11 (bismuth gallium tetratitanium undecaoxide), was prepared by heating a mixture of the binary oxides at 1373 K in air. BiGaTi4O11 melts at 1487 K and prismatic single crystals were obtained from a sample melted at 1523 K and solidified by furnace cooling. The structure of BiGaTi4O11 was analyzed using single‐crystal X‐ray diffraction to be of a new type that crystallized in the space group Cmcm. A Bi3+ site is coordinated by nine O2? anions, and three oxygen‐coordinated octahedral sites are statistically occupied by Ga3+ and Ti4+ cations. A relative dielectric constant of 46 with a temperature coefficient of 57 ppm K?1 in the temperature range 297–448 K was measured for a polycrystalline ceramic sample at 150 Hz–1 MHz with a dielectric loss tan δ of less than 0.01. Electrical resistivities measured at 1073 K by alternating‐current impedance spectroscopic and direct‐current methods were 1.16 × 10?4 and 1.14 × 10?4 S cm?1, respectively, which indicates that electrons and/or holes were conduction carriers at high temperature. The optical band gap estimated by the results of diffuse reflectance analysis was 2.9–3.0 eV, while the band gap obtained from the activation energy for electrical conduction was 3.5 eV. 相似文献