ONO pincer type Pd(ii) complexes: synthesis, crystal structure and catalytic activity towards C-2 arylation of quinoline scaffolds

RSC Advances ◽  
2015 ◽  
Vol 5 (95) ◽  
pp. 77948-77957 ◽  
Author(s):  
Vignesh Arumugam ◽  
Werner Kaminsky ◽  
Dharmaraj Nallasamy
Keyword(s):  
Crystal Structure ◽  
Catalytic Activity ◽  
Single Crystal ◽  
Bond Formation ◽  
Xrd Analysis ◽  
Single Crystal Xrd ◽  
Hydrazone Ligands ◽  
Single Crystal Xrd Analysis

Four new palladium(ii) complexes featuring ONO pincer type hydrazone ligands were synthesized and characterized by spectroscopic and single-crystal XRD analysis. Utility of these complexes to catalyze C–C bond formation in quinoline scaffolds were assessed.

scholarly journals Synthesis of Functionalized 9-Substituted Fluorene Derivatives via Boron Trifluoride Catalysed Reaction of Coplanar 9-(Phenylethynyl)-9H-fluoren-9-ols, Aryl Aminoamides and N-Bromosuccinimide

SynOpen ◽  
2021 ◽  
Vol 05 (01) ◽  
pp. 17-24
Author(s):  
Ponnusamy Shanmugam ◽  
Mohanakumaran Athira
Keyword(s):  
Single Crystal ◽  
Boron Trifluoride ◽  
Xrd Analysis ◽  
Single Crystal Xrd ◽  
Excellent Yield ◽  
Catalysed Reaction ◽  
Plausible Mechanism ◽  
Single Crystal Xrd Analysis

AbstractA boron trifluoride catalysed reaction of coplanar 9-(phenyl­ethynyl)-9H-fluoren-9-ols with various 2-aminobenzamides affords a number of highly functionalized, conjugated (Z)-2-((2-(9H-fluoren-9-ylidene)-1-phenylethylidene)amino) benzamides in excellent yield. The reaction in the presence of N-bromosuccinimide affords (E)-5-bromo-2-((2-bromo-2-(9H-fluoren-9-ylidene)-1-phenylethylidene)amino)benz­amides in very good yields. The scope of the reaction is demonstrated by selecting N-aryl substituted 2-aminobenzamides and aminosulfonamides as reaction partners. The structures of representative compounds were established by single-crystal XRD analysis. Based on the structure of the products, a plausible mechanism via formation of allene carbocation intermediates is proposed.

scholarly journals A dual-mode highly selective and sensitive Schiff base chemosensor for fluorescent colorimetric detection of Ni2+ and colorimetric detection of Cu2+

2019 ◽  
Vol 18 (6) ◽  
pp. 1512-1525 ◽  
Author(s):  
Amit Kumar Manna ◽  
Kalyani Rout ◽  
Shubhamoy Chowdhury ◽  
Goutam K. Patra
Keyword(s):  
Schiff Base ◽  
Single Crystal ◽  
Colorimetric Detection ◽  
Xrd Analysis ◽  
Single Crystal Xrd ◽  
Dual Mode ◽  
Single Crystal Xrd Analysis

In this paper, a novel flexible Schiff base chemosensor L has been designed, synthesised and characterised by single crystal XRD analysis and exploited as fluorescent colorimetric detection of Ni2+ and colorimetric detection of Cu2+.

Crystal-packing modes determine the solid-state ESIPT fluorescence in highly dipolar 2′-hydroxychalcones

2021 ◽  
Author(s):  
Alix Tordo ◽  
Erwann Jeanneau ◽  
Mathieu Bordy ◽  
Yann Bretonnière ◽  
Jens Hasserodt
Keyword(s):  
Solid State ◽  
Single Crystal ◽  
Crystal Packing ◽  
Xrd Analysis ◽  
Quantum Yields ◽  
Single Crystal Xrd ◽  
Structure Property ◽  
Crystal State ◽  
Structure Property Relationship ◽  
Single Crystal Xrd Analysis

Fifteen easily assembled ESIPT-active 2′-hydroxychalcones were prepared to identify deep-red crystal-state fluorophores with increased quantum yields. Systematic single-crystal XRD analysis furnished trends in the structure–property relationship.

Synthesis and Transformation of 5-Acetyl-2-aryl-6-hydroxybenzofurans into Furanoflavanone Derivatives

Synthesis ◽  
2019 ◽  
Vol 51 (18) ◽  
pp. 3431-3442 ◽  
Author(s):  
Malose J. Mphahlele ◽  
Temitope O. Olomola
Keyword(s):  
Single Crystal ◽  
Aldol Condensation ◽  
Cross Coupling ◽  
Xrd Analysis ◽  
Single Crystal Xrd ◽  
Palladium Catalyzed ◽  
Benzaldehyde Derivatives ◽  
Single Crystal Xrd Analysis

Tandem palladium-catalyzed Sonogashira cross-coupling and heteroannulation of 3-bromo-2,4-dihydroxy-5-iodoacetophenone with arylacetylenes followed by the base-mediated Claisen–Schmidt aldol condensation of the intermediate 5-acetyl-2-aryl-7-bromo-6-hydroxybenzofurans with benzaldehyde derivatives afforded the corresponding linear 2-arylbenzofuranchalcone hybrids. The presence of the o-hydroxy-trans-α,β-unsaturated carbonyl moiety in the prepared furanochalcone hybrids facilitated acid-mediated cycloisomerization into the corresponding linear furanoflavanones. The structures of the prepared compounds were confirmed using a combination of spectrometric techniques complemented with single crystal XRD analysis.

scholarly journals Tripodal Oxazolidine-N-Oxyl Diradical Complexes of Dy3+ and Eu3+

Inorganics ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 91
Author(s):  
Philippe Rey ◽  
Andrea Caneschi ◽  
Taisiya S. Sukhikh ◽  
Kira E. Vostrikova
Keyword(s):  
Single Crystal ◽  
Coordination Sphere ◽  
Magnetic Measurements ◽  
Central Atom ◽  
Xrd Analysis ◽  
Point Symmetry ◽  
Single Crystal Xrd ◽  
Nitroxide Group ◽  
Single Crystal Xrd Analysis

Two diradical complexes of the formula [LnRad2(CF3SO3)3] c (Ln(III) = Dy, Eu, Rad = 4,4-dimethyl-2,2-bis(pyridin-2-yl)-1,3-oxazolidine-3-oxyl) were obtained in air conditions. These are the first examples of diradical compounds of lanthanides and oxazolidine nitroxide. The complexes were characterized crystallographically and magnetically. Single crystal XRD analysis revealed that their coordination sphere is composed of three monodentate triflates and two tripodal Rad, which coordinate the central atom in a tridentate manner via two N atoms of the pyridine groups and the O atom of a nitroxide group. The LnO5N4 polyhedron represents a spherical capped square antiprism with point symmetry close to C4v. The data of static magnetic measurements are compatible with the presence of two paramagnetic ligands in the coordination sphere of the metal.

scholarly journals Crystal structure of a Zn complex with terephthalate and 1,6-bis(1,2,4-triazol-1-yl)hexane

2018 ◽  
Vol 74 (1) ◽  
pp. 6-9 ◽  
Author(s):  
Taisiya S. Sukhikh ◽  
Evgeny Yu. Semitut ◽  
Andrei S. Potapov
Keyword(s):  
Crystal Structure ◽  
Thermogravimetric Analysis ◽  
Coordination Polymer ◽  
Layered Structure ◽  
Solvent Molecule ◽  
Xrd Analysis ◽  
Formula Unit ◽  
Single Crystal Xrd ◽  
Zinc Coordination ◽  
Single Crystal Xrd Analysis

A new zinc coordination polymer with rigid benzene-1,4-dicarboxylate (bdc) and flexible 1,6-bis(1,2,4-triazol-1-yl)hexane (btrh), namely poly[[(μ2-benzene-1,4-dicarboxylato)[μ2-1,6-bis(1,2,4-triazol-1-yl)hexane]zinc] dimethylformamide monosolvate], [Zn(C8H4O4)(C10H16N6)]·C3H7NO, was synthesized. According to the single-crystal XRD analysis, the product crystallizes in theP-1 space group and has a layered structure. Analysis of the layered structure reveals {Zn(bdc)} chains which are connected by pairs of btrh ligands. The layers are packed tightly perpendicular to the [1-22] direction, separated by one non-disordered dimethylformamide solvent molecule per formula unit. According to thermogravimetric analysis, the product completely loses this solvent at 453 K; the desolvated compound is stable up to 503 K. As a result of the lack of hydrogen-donor groups, hydrogen bonds are not observed in the structure of the complex; however, an intermolecular C—H...π contact of 3.07 Å occurs.

Hydroxylian pseudorutile in an adamellite from the Nkambe area, Cameroon

2003 ◽  
Vol 67 (3) ◽  
pp. 509-516 ◽  
Author(s):  
S. Tetsopgang ◽  
J. Koyanagi ◽  
M. Enami ◽  
K. Kihara
Keyword(s):  
Solid Solution ◽  
Single Crystal ◽  
Point Group ◽  
Xrd Analysis ◽  
Lattice Parameters ◽  
Single Crystal Xrd ◽  
Hexagonal Symmetry ◽  
Ft Ir ◽  
End Members ◽  
Single Crystal Xrd Analysis

AbstractHydroxylian pseudorutile in an adamellite from Cameroon has been identified using EPMA, FT-IR and single-crystal XRD analysis. TiO2 and Fe2O3 contents range between 60.6 and 67.9 wt.% and 22.2 and 36.5 wt.%, respectively, and totals vary from 90.1 to 98.1 wt.%. The SiO2 (0.03 —1.40 wt.%), Al2O3 (0.02—0.68 wt.%) and CaO (0.03—0.44 wt.%) contents increase systematically and MnO (0.04—0.69 wt.%) decreases slightly with decreasing Fe3+/Ti values. The MgO content is <0.06 wt.%. H2O contents (1.3—7.5 wt.%) are greater in parts of crystals with lower Fe3+/Ti, suggesting solid solution between the end-members Fe3+2Ti3O9 and Fe3+Ti3O6(OH)3. The lattice parameters are a = 2.85 Å and c = 4.57 Å with hexagonal symmetry and point group 6/mmm.

Th@D5h(6)-C80: highly symmetric fullerene cage stabilized by a single metal ion

2021 ◽  
Author(s):  
Ning Chen ◽  
Yingjing Yan ◽  
Roser Morales-Martínez ◽  
Jiaxin Zhuang ◽  
Yang-Rong Yao ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Raman Spectroscopy ◽  
Single Crystal ◽  
Metal Ion ◽  
Xrd Analysis ◽  
Fullerene Cage ◽  
Single Crystal Xrd ◽  
X Ray Diffraction ◽  
X Ray ◽  
Single Crystal Xrd Analysis

A novel endohedral metallofullerene (mono-EMF), Th@D5h(6)-C80, has been successfully synthesized and fully characterized by mass spectrometry, single crystal X-ray diffraction, UV-vis-NIR, Raman spectroscopy and cyclic voltammetry. Single crystal XRD analysis...

scholarly journals Crystal Structure of Moganite and Its Anisotropic Atomic Displacement Parameters Determined by Synchrotron X-ray Diffraction and X-ray/Neutron Pair Distribution Function Analyses

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 272
Author(s):  
Seungyeol Lee ◽  
Huifang Xu ◽  
Hongwu Xu ◽  
Joerg Neuefeind
Keyword(s):  
Crystal Structure ◽  
Distribution Function ◽  
Single Crystal ◽  
Pair Distribution Function ◽  
Atomic Displacement ◽  
Single Crystal Xrd ◽  
X Ray Diffraction ◽  
X Ray ◽  
Neutron Pair ◽  
Atomic Displacement Parameters

The crystal structure of moganite from the Mogán formation on Gran Canaria has been re-investigated using high-resolution synchrotron X-ray diffraction (XRD) and X-ray/neutron pair distribution function (PDF) analyses. Our study for the first time reports the anisotropic atomic displacement parameters (ADPs) of a natural moganite. Rietveld analysis of synchrotron XRD data determined the crystal structure of moganite with the space group I2/a. The refined unit-cell parameters are a = 8.7363(8), b = 4.8688(5), c = 10.7203(9) Å, and β = 90.212(4)°. The ADPs of Si and O in moganite were obtained from X-ray and neutron PDF analyses. The shapes and orientations of the anisotropic ellipsoids determined from X-ray and neutron measurements are similar. The anisotropic ellipsoids for O extend along planes perpendicular to the Si-Si axis of corner-sharing SiO4 tetrahedra, suggesting precession-like movement. Neutron PDF result confirms the occurrence of OH over some of the tetrahedral sites. We postulate that moganite nanomineral is stable with respect to quartz in hypersaline water. The ADPs of moganite show a similar trend as those of quartz determined by single-crystal XRD. In short, the combined methods can provide high-quality structural parameters of moganite nanomineral, including its ADPs and extra OH position at the surface. This approach can be used as an alternative means for solving the structures of crystals that are not large enough for single-crystal XRD measurements, such as fine-grained and nanocrystalline minerals formed in various geological environments.

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