共查询到20条相似文献,搜索用时 125 毫秒
1.
A. López-Hernández K. Venkatesan H. W. Schmalle Heinz Berke 《Monatshefte für Chemie / Chemical Monthly》2009,36(10):845-857
Abstract
Stable paramagnetic Cr(II) and Cr(III) bis(alkynyl) complexes of the type [trans(RC≡C)2Cr(dmpe)2] n+ (R = Ph, SiMe3, SiEt3, C≡C–SiMe3 n = 0, 1) were prepared and characterised by NMR, cyclic voltammetry, EPR, magnetic measurements, and X-ray single-crystal diffraction studies. 相似文献2.
Florian Kraus 《Monatshefte für Chemie / Chemical Monthly》2012,41(8):1097-1100
Abstract
Hexaamminecadmium(II) fluoride monohydrate (1:1) [Cd(NH3)6]F2·H2O was synthesized from CdF2 and liquid ammonia in open reaction vessels, so that moisture from the air was in contact with the solvent. The compound crystallizes in the chiral space group P3121- (No. 152) in the form of needle-shaped, colorless crystals with a = 6.8974(1) ?, c = 17.7156(5) ?, V = 729.89(3) ?3, and Z = 3. 相似文献3.
Synthesis of 5-spirocyclohexyl-2,4-dithiohydantoin derivatives: a potential anti-leishmaniasis agent
Abdel-Sattar S. Hamad Elgazwy Saad R. Atta-Allha Sherif M. A. S. Keshk 《Monatshefte für Chemie / Chemical Monthly》2009,1(1):243-249
Abstract
A series of spiro-dithiohydantoins were synthesized by heating a mixture of 5-spirocyclohexyl-2,4-dithiohydantoin potassium salt and 3-chloropropanoyl chloride. These compounds were synthesized and evaluated for their activity against five Leishmanial strains in the promastigote stage in vitro. Seventy-two hours inoculation of a variety of products gave an IC 100 and average IC 50 values of 1.25 and 0.376 mg/cm3 against all Leishmanial strains tested. 相似文献4.
Abstract
The complex [Fe(C6H4N2S2)3]2+(NO3−)2 was prepared from the reaction of 4,4′-bithiazole with Fe(NO3)3·9H2O in methanol. It was characterized by IR, UV-Vis, luminescence, 1H NMR and 13C NMR spectroscopy, and X ray crystallography. The structure was solved in the orthorhombic space group P212121 with a = 12.1500(5), b = 12.8434(6), c = 16.2222(7) ?, V = 2531.43(19) ?3, Z = 4, and with wR 2 = 0.0897. 相似文献5.
Fangfang Dang Xinwei Wang Guoping Han Yahong Yao 《Monatshefte für Chemie / Chemical Monthly》2009,36(2):615-617
Abstract
A 3D metal-organic framework, [C6H3CdN2O4]·NH4, was synthesized solvothermally and structurally characterized by single-crystal X-ray structure determination. This compound crystallizes in the tetragonal system with the space group P42/nmc. The crystal structure presents a 3D framework and open channels, exhibiting guest-coordination sites at channel walls and strong fluorescent emission. 相似文献6.
Abstract
Arylaminotetrazoles were efficiently synthesized from secondary arylcyanamides by application of ZnCl2/AlCl3/silica as a reusable heterogeneous Lewis acid catalyst. 5-Arylamino-1H-tetrazoles can be obtained from arylcyanamides carrying electron-withdrawing substituents on the aryl ring, while with electron-releasing groups 1-aryl-5-amino-1H-tetrazoles will be produced. The former isomer is also produced within longer reaction times (~20 h) even with electron-releasing groups. 相似文献7.
Ben-Mei Wei Zhi-Yong Zhang Zhi-Qun Dai Kai-Cheng Zhang 《Monatshefte für Chemie / Chemical Monthly》2011,57(1):1029-1033
Abstract
Dealkylation of esters to carboxylic acids was performed using chloroaluminate ionic liquids (PyHBr/AlCl3, PyHCl/AlCl3, Me3NHCl/AlCl3, Et3NHCl/AlCl3) as catalyst and medium. The catalytic activity of PyHBr/AlCl3 (X(AlCl3) = 0.67) proved to be superior to the other three ionic liquids for the dealkylation of methyl benzoate with a conversion of 97% after 3 h at 140 °C. After easy separation from the products the ionic liquid PyHBr/AlCl3 could be reused six times without loss of its activity. 相似文献8.
Abstract
3-Aryl-4(3H)-quinazolinones were synthesized efficiently by the three component one-pot cyclocondensation of anthranilic acid, ortho esters, and anilines in the presence of Ce(CH3SO3)3·2H2O at room temperature under solvent-free conditions. This method offers several advantages, such as a simple procedure, mild reaction conditions, short reaction time, and reusability of the catalyst. 相似文献9.
Hamdi Ben Yahia Ute Ch. Rodewald Rainer P?ttgen 《Monatshefte für Chemie / Chemical Monthly》2010,37(12):495-499
Abstract
The titanyl arsenate NaTiO[AsO4] was synthesized in the form of colourless lath-shaped crystals from arsenic and titanium dioxide in a NaCl/KCl flux at 850 °C. NaTiO[AsO4] crystallizes with the monoclinic low-temperature form LT-CaTiO[SiO4], space group P21/c. The structure was refined from single crystal diffractometer data: a = 6.7170(9), b = 8.7707(12), c = 7.2447(10) ?, β = 114.77(1)°, wR2 = 0.0559, 789 F 2 values, and 74 variables. NaTiO[AsO4] is characterized by a topology common to a wide range of oxide structures of stoichiometry AMOXO4. It consists of parallel chains of trans-corner-sharing TiO6 octahedra, cross-linked by isolated AsO4 tetrahedra. 相似文献10.
Abstract
Oxovanadium(IV/V) complexes of 2-hydroxyacetophenone-3-hydroxy-2-naphthoylhydrazone (H2L) have been synthesized and characterized. The complexes were characterized by elemental analyses, IR, electronic and EPR spectra. The oxovanadium(V) complex [VOL(OCH3)] is crystallized in two polymorphic forms, denoted by 1a and 1b, with space groups Pn21a and P[`1] P_{{\bar{1}}} , respectively. Both have distorted square pyramidal structures. 相似文献11.
Zhan-Hui Zhang Hong-Juan Wang Xiao-Qian Ren Yan-Yan Zhang 《Monatshefte für Chemie / Chemical Monthly》2009,7(1):1481-1483
Abstract
HBF4/SiO2 was used as an efficient, green, and inexpensive catalytic system for synthesis of 12-aryl or 12-alkyl-8,9,10,12-tetrahydro-11H-benzo[a]xanthen-11-one derivatives via a one-pot three-component reaction of aldehydes, 2-naphthol, and cyclic 1,3-dicarbonyl compounds. The reactions proceeded rapidly at 80 °C under solvent-free conditions and the desired products were obtained in good to excellent yields. 相似文献12.
Jolanta Nieszporek 《Monatshefte für Chemie / Chemical Monthly》2010,36(11):521-527
Abstract
A two-step Zn2+ ion reduction was estimated at the dropping mercury electrode in 2, 3, and 4 mol dm−3 NaClO4 with the addition of tetramethylthiourea using an impedance method at wide potential and frequency ranges. With increasing tetramethylthiourea and NaClO4 concentrations the k\texts 1 t k_{{{\text{s}}_{ 1} }}^{t} and k\texts 2 t k_{{{\text{s}}_{ 2} }}^{t} values increased, achieving their maximum values at the highest concentrations of tetramethylthiourea in 3 and 4 mol dm−3 NaClO4 solutions. The catalytic effect of tetramethylthiourea at its lowest employed concentration increased with increasing NaClO4 concentration. 相似文献13.
Qin Hou Xue-Jian Qu Juan Jin Jin-Jing Zhao Jie-Hui Yu Ji-Qing Xu 《Journal of Cluster Science》2011,22(4):715-722
Abstract
In methanol solutions, two types of organic N-donor ligands bta and dabco (bta = benzotriazole; dabco = 1,4-diazabicyclo[2,2,2]octane) were selected to react with CuI under the solvothermal conditions, creating two new copper(I) iodides as one-dimensional (1D) chained [CuI(bta)] 1 and tetranuclear [(mdabco)2Cu4I6] (mdabco = N-methyl-1,4-diazabicyclo[2,2,2]octane). Note that mdabco derived from the solvothermal in situ alkylation reaction between dabco and methanol solvent. The photoluminescence analysis revealed that compound 2 is a potential fluorescence material with maximum emission at 506 nm. 相似文献14.
Abstract
The palladium-rich cadmium compounds La6Pd13Cd4 and Ce6Pd13Cd4 were synthesized by induction melting the elements in sealed tantalum ampoules and subsequent annealing. They were characterized by X-ray powder and single-crystal diffraction: Na16Ba6N type, Im[`3] mIm\overline{3} m, a = 988.12(9) pm, wR2 = 0.0463, 225 F 2 values, and 12 variables for La6Pd13Cd4, and a = 982.1(2) pm, wR2 = 0.0521, 215 F 2 values, and 12 variables for Ce6Pd13Cd4. The striking structural motifs are palladium-centred La6 and Ce6 octahedra, which are packed in a bcc fashion. Further palladium and cadmium atoms built up three-dimensional [Pd3Cd] networks in which the La6Pd and Ce6Pd octahedra are embedded. Chemical bonding analyses show that the dominant interaction occurs within the palladium-centred RE 6 octahedra, while weaker bonding exists between them. 相似文献15.
Grzegorz Zi?ba Marcin Rojkiewicz Violetta Kozik Krystyna Jarzembek Anna Jarczyk Aleksander Sochanik Piotr Ku? 《Monatshefte für Chemie / Chemical Monthly》2012,58(4):153-159
Abstract
A series of mono-alkylcarboxylic acid derivatives of tetraphenylporphyrin have been prepared. All the porphyrins were completely characterized by use of mass, 1H NMR, UV–visible, and fluorescence spectroscopy. Experimental log P were determined by use of reversed-phase thin-layer chromatography with use of log P Rekker. These porphyrins are potential photosensitizers in photodynamic therapy. 相似文献16.
Emanuel Makrlík Petr Vaňura Jan Budka 《Monatshefte für Chemie / Chemical Monthly》2009,287(1):583-585
Abstract
The stability constant of the dibenzo-18-crown-6·H3O+ cationic complex species dissolved in nitrobenzene saturated with water has been determined from extraction experiments in the two-phase water–nitrobenzene system and from γ-activity measurements. Various structures of protonated dibenzo-18-crown-6 are discussed. 相似文献17.
Min Wang Zhi-Guo Song Xin Wan Suang Zhao 《Monatshefte für Chemie / Chemical Monthly》2009,3(2):1205-1208
Abstract
SnCl2-catalyzed three-component one-pot Mannich reaction of acetophenone or p-chloroacetophenone with different aromatic aldehydes and aromatic amines in ethanol at ambient temperature gave the corresponding β-aminocarbonyl compounds in good to excellent yields. Four new compounds are reported for the first time. 相似文献18.
Brina Dojer Amalija Golobi? Zvonko Jagli?i? Matja? Kristl Miha Drofenik 《Monatshefte für Chemie / Chemical Monthly》2012,19(5):175-180
Abstract
A new coordination compound of zinc fluoride and hydroxylammonium, (NH3OH)2ZnF4, was obtained after dissolving zinc powder in hydrofluoric acid (40%) and adding solid hydroxylammonium fluoride. The colourless crystals were characterised chemically, magnetically, structurally by single-crystal X-ray diffraction analysis, and thermogravimetrically by TGA and DSC analysis. The structure consists of NH3OH+ cations and ZnF6 octahedra in which the metal ion lies on the inversion centre. Each of the ZnF6 octahedra shares four of its vertices in a way that each vertex is shared between two octahedra. Oxygen and nitrogen atoms of hydroxylammonium cations are donors of hydrogen bonds. Hydroxylamonium fluorozincate crystallizes monoclinic, P21/c, with cell parameters a = 8.1604(4) ?, b = 5.8406(3) ?, c = 5.6586(2) ? and β = 94.745(3)°. The compound decomposes above 373 K in four steps, obtaining ZnO as the final residue. Magnetic properties of the compound were studied between 2 and 300 K, giving the prevailing diamagnetic behaviour with room temperature susceptibility of −9 × 10−5 emu mol−1. 相似文献19.
Matja? Kristl Amalija Golobi? Brina Dojer Miha Drofenik 《Monatshefte für Chemie / Chemical Monthly》2011,38(10):755-762
Abstract
Hydroxylammonium fluoroaluminate with the formula (NH3OH)2AlF5 was synthesized by the reaction of solid NH3OHF and an aqueous solution of aluminum in HF, and its structure was determined by single-crystal X-ray diffraction. The structure consists of NH3OH+ cations and centrosymmetrical AlF6 octahedra, which are formed by sharing two opposite corners connected in polymeric (AlF5)n2− anions. Oxygen and nitrogen atoms of hydroxylammonium cations are donors of hydrogen bonds to terminal fluorine atoms of fluoroaluminate chains. The compound crystallizes monoclinic P2/c, with cell parameters a = 10.8675(3) ?, b = 7.3098(2) ?, c = 7.2071(2) ?, and β = 91.080(2)°. The thermal decomposition of the compound was studied by TG, DSC, and X-ray powder diffraction. By controlled heating of (NH3OH)2AlF5, a new compound with the formula (NH3OH)AlF4 was obtained, and the final product of the decomposition is γ-AlF3. 相似文献20.
Issa Yavari Nasir Iravani S. Zahra Sayyed-Alangi Rahimeh Hajinasiri 《Monatshefte für Chemie / Chemical Monthly》2009,35(1):1199-1204