A multifunctional catenated host for the efficient binding of Eu3+ and Gd3+

2019 ◽  
Vol 55 (21) ◽  
pp. 3085-3088 ◽  
Author(s):  
Mandira Nandi ◽  
Somnath Bej ◽  
Tamal Kanti Ghosh ◽  
Pradyut Ghosh
Keyword(s):  
Single Crystal ◽  
Functional Groups ◽  
X Ray

[2]Catenane consists of various functional groups and shows efficient binding towards Eu3+ and Gd3+. A cavity-bound catenated structure is also demonstrated by single crystal X-ray analysis.

Environmentally Friendly Nafion-Mediated Friedländer Quinoline Synthesis under Microwave Irradiation: Application to One-Pot Synthesis of Substituted Quinolinyl Chalcones

Synthesis ◽  
2020 ◽  
Vol 52 (12) ◽  
pp. 1779-1794 ◽  
Author(s):  
Cheng-Chung Wang ◽  
Chieh-Kai Chan ◽  
Chien-Yu Lai
Keyword(s):  
Microwave Irradiation ◽  
Single Crystal ◽  
Diffraction Analysis ◽  
Functional Groups ◽  
Chemical Method ◽  
Solid Catalyst ◽  
Synthetic Route ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray

An efficient and eco-friendly synthetic route for Friedländer quinoline synthesis of polysubstituted quinolines is described. This green chemical method starts from various 2-aminobenzophenones and mono- or dicarbonyl synthons and uses reusable Nafion NR50 material as a solid catalyst in ethanol under microwave irradiation. The protocol has a high generality of functional groups and provides the desired quinolines in good to excellent yields. Some structures were confirmed by single-crystal X-ray diffraction analysis.

scholarly journals Insertion of [1.1.1]propellane into aromatic disulfides

2019 ◽  
Vol 15 ◽  
pp. 1172-1180 ◽  
Author(s):  
Robin M Bär ◽  
Gregor Heinrich ◽  
Martin Nieger ◽  
Olaf Fuhr ◽  
Stefan Bräse
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
Functional Groups ◽  
Column Chromatography ◽  
Disulfide Bonds ◽  
Radical Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Methoxy Groups ◽  
Novel Methods

Herein we present the synthesis of symmetrically and unsymmetrically substituted 1,3-bissulfanylbicyclo[1.1.1]pentanes from disulfides and [1.1.1]propellane. Bicyclo[1.1.1]pentanes (BCPs) recently gained interest as rigid linkers and as bioisosters of para-substituted benzene and alkyne moieties. The most promising precursor for BCPs is [1.1.1]propellane (1). The available methods to synthesize BCPs are quite limited and many groups contribute to the development of novel methods. The insertion of 1 into disulfide bonds is known, but has never been thoroughly investigated. In this study, we show that an UV initiated radical reaction can be used to synthesize symmetrically and unsymmetrically substituted BCP sulfides by reaction of [1.1.1]propellane (1) with disulfides. Depending on the ratio of 1 to the disulfide, only the BCP product (with up to 98% yield) or a mixture of BCP and [2]staffane can be obtained. The reaction tolerates functional groups such as halogens, alkyl and methoxy groups. The separation of the corresponding BCP and [2]staffane products is challenging but possible by column chromatography and preparative TLC in most cases. Single crystal X-ray diffraction analysis confirms the rod-like structure of the [2]staffanes that is often required in material applications.

scholarly journals Synthesis, structural characterization, and optical properties of benzo[f]naphtho[2,3-b]phosphoindoles

2021 ◽  
Vol 17 ◽  
pp. 671-677
Author(s):  
Mio Matsumura ◽  
Takahiro Teramoto ◽  
Masato Kawakubo ◽  
Masatoshi Kawahata ◽  
Yuki Murata ◽  
...  
Keyword(s):  
Optical Properties ◽  
Fluorescence Spectroscopy ◽  
Single Crystal ◽  
Functional Groups ◽  
Phosphine Oxide ◽  
Structural Characterization ◽  
Phosphorus Atom ◽  
Starting Material ◽  
Spectroscopy Data ◽  
X Ray

Phosphole-fused π-conjugated acenes have been attracting interest because of the attractive features of the phosphole moiety, such as fluorescence and chemically modifiable properties. Herein, 6-phenyl-6H-benzo[f]naphtho[2,3-b]phosphoindole was prepared by reacting dichlorophenylphosphine with a dilithium intermediate derived from 3,3′-dibromo-2,2′-binaphthyl. Various derivatives, such as a phospholium salt and a borane–phosphole complex with functional groups on the phosphorus atom were synthesized using the obtained phosphole as a common starting material. Single-crystal X-ray analysis of the parent benzo[f]naphtho[2,3-b]phosphoindole revealed that the pentacyclic ring is almost planar. Fluorescence spectroscopy data showed that the phosphole derivatives, such as phosphine oxide and the phospholium salt and borane complex exhibited photoluminescence in chloroform.

scholarly journals Overcoming the Challenges towards Selective C(6)-H Alkylation of 2-Pyridone with Maleimide through Mn(I)-Catalyst: Migration of directing group through cleavage of C-N bond for the formation of all-carbon quaternary carbon center

2021 ◽  
Author(s):  
Smruti Ranjan Mohanty ◽  
Namrata Prusty ◽  
Shyam Kumar Banjare ◽  
Tanmayee Nanda ◽  
Ponneri C. Ravikumar
Keyword(s):  
Acetic Acid ◽  
Single Crystal ◽  
Functional Groups ◽  
Pyridine Ring ◽  
Diels Alder ◽  
Quaternary Carbon ◽  
X Ray ◽  
Earth Abundant ◽  
Directing Group ◽  
First Time

An earth-abundant and inexpensive Mn(I)-catalyzed alkylation of 2-pyridone with maleimide has been reported for the first time, in contrast to previously reported Diels-alder product. The directing group was easily removed after functionalization. Notably, unexpected migration of pyridine ring has been discovered in presence of acetic acid, which also provides unique class of compounds with three different N-heterocycles with an all-carbon quaternary carbon center. Furthermore, single crystal X-ray and HRMS revealed a five-membered manganacycle intermediate. This methodology tolerates a wide variety of functional groups delivering the alkylated products in moderate to excellent yields.

Electron Microscopy of Shock Loaded Polycrystalline Beryllium

1974 ◽  
Vol 32 ◽  
pp. 506-507 ◽  
Author(s):  
J. M. Galbraith ◽  
L. E. Murr ◽  
A. L. Stevens
Keyword(s):  
Electron Microscopy ◽  
Wave Propagation ◽  
Structural Change ◽  
Single Crystal ◽  
Diffraction Pattern ◽  
Shock Loading ◽  
Slip Systems ◽  
Compression Tests ◽  
X Ray Diffraction ◽  
X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

Crystal structure of an inclusion complex between chiral monoaza-15-crown-5 and S(–)-1-phenyl-ethyl ammonium percholorate

2003 ◽  
Vol 218 (5) ◽  
Author(s):  
Süheyla Özbey ◽  
F. B. Kaynak ◽  
M. Toğrul ◽  
N. Demirel ◽  
H. Hoşgören
Keyword(s):  
Crystal Structure ◽  
Inclusion Complex ◽  
Single Crystal ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
New Type

AbstractA new type of inclusion complex, S(–)-1 phenyl ethyl ammonium percholorate complex of R-(–)-2-ethyl - N - benzyl - 4, 7, 10, 13 - tetraoxa -1- azacyclopentadecane, has been prepared and studied by NMR, IR and single crystal X-ray diffraction techniques. The compound crystallizes in space group

Single Crystal Growth of High-Pressure Phases of Ice and Salt Hydrate Far Below the Original Melting Point by Mixing Alcohol: Crystal Structure Determination of Magnesium Chloride Heptahydrate

2020 ◽  
Author(s):  
Keishiro Yamashita ◽  
Kazuki Komatsu ◽  
Hiroyuki Kagi
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Crystal Growth ◽  
Single Crystal ◽  
Room Temperature ◽  
Growth Technique ◽  
Salt Hydrate ◽  
X Ray

An crystal-growth technique for single crystal x-ray structure analysis of high-pressure forms of hydrogen-bonded crystals is proposed. We used alcohol mixture (methanol: ethanol = 4:1 in volumetric ratio), which is a widely used pressure transmitting medium, inhibiting the nucleation and growth of unwanted crystals. In this paper, two kinds of single crystals which have not been obtained using a conventional experimental technique were obtained using this technique: ice VI at 1.99 GPa and MgCl<sub>2</sub>·7H<sub>2</sub>O at 2.50 GPa at room temperature. Here we first report the crystal structure of MgCl2·7H2O. This technique simultaneously meets the requirement of hydrostaticity for high-pressure experiments and has feasibility for further in-situ measurements.

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