Bis(μ-carboxylato)dienerhodium(I) Complexes - Synthesis, Characterization and Catalytic Activity

2008 ◽  
Vol 73 (8-9) ◽  
pp. 1205-1221 ◽  
Author(s):  
Jiří Zedník ◽  
Jan Sedláček ◽  
Jan Svoboda ◽  
Jiří Vohlídal ◽  
Dmitrij Bondarev ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Diffraction Analysis ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
X Ray

Dinuclear rhodium(I) η2:η2-cycloocta-1,5-diene (series a) and η2:η2-norborna-2,5-diene (series b) complexes with μ-RCOO- ligands, where R is linear C21H43 (complexes 1a, 1b), CH2CMe3 (2a, 2b), 1-adamantyl (3a, 3b) and benzyl (4a, 4b), have been prepared and characterized by spectroscopic methods. Structures of complexes 2b, 3a and 4a were determined by X-ray diffraction analysis. Complexes prepared show low to moderate catalytic activity in polymerization of phenylacetylene in THF giving high-cis-transoid polymers, but they show only oligomerization activity in dichloromethane.

scholarly journals A Pair of New Polyketide Enantiomers from Three Endolichenic Fungal Strains Nigrospora sphaerica, Alternaria alternata, and Phialophora sp

2016 ◽  
Vol 11 (6) ◽  
pp. 1934578X1601100 ◽  
Author(s):  
Jun-Wei He ◽  
Chuan-Xi Wang ◽  
Li Yang ◽  
Guo-Dong Chen ◽  
Dan Hu ◽  
...  
Keyword(s):  
Diffraction Analysis ◽  
Alternaria Alternata ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fungal Strains ◽  
The Absolute ◽  
Modified Mosher’S Method

A pair of new enantiomeric polyketides, (-)- and (+)-nigrosporaol A (1a and 1b), along with one related known compound, (±)-alternarienoic acid (2), were isolated from three endolichenic fungal strains, Nigrospora sphaerica (No.83-1-1-2), Alternaria alternata (No.58-8-4-1), and Phialophora sp.(No.96-1-8-1). Their structures, including the absolute configurations, were elucidated on the basis of spectroscopic methods, X-ray diffraction analysis, and the modified Mosher's method.

Synthesis, Characterization, and Catalytic Activity of a Series of Aluminium–Amidate Complexes

2015 ◽  
Vol 68 (3) ◽  
pp. 357 ◽  
Author(s):  
Kevin P. Yeagle ◽  
Darryl Hester ◽  
Nicholas A. Piro ◽  
William G. Dougherty ◽  
W. Scott Kassel ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Nmr Spectroscopy ◽  
Diffraction Analysis ◽  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
X Ray Diffraction ◽  
Metathesis Reaction ◽  
Chloride Complexes ◽  
1H And 13C Nmr ◽  
X Ray

The aluminium complexes {[κ2-N,O-(t-BuNCOPh)]AlMe2}2 (2), [κ2-N,O-(t-BuNCOPh)]2AlMe (3), and [κ2-N,O-(t-BuNCOPh)]3Al (4) were prepared through the protonolysis reaction between trimethylaluminium and one, two, or three equivalents, respectively, of N-tert-butylbenzamide. Complex 2 was also prepared via a salt metathesis reaction between K(t-BuNCOPh) and dimethylaluminium chloride. Complexes 2–4 were characterized using 1H and 13C NMR spectroscopy. Single-crystal X-ray diffraction analysis of the complexes corroborated ligand : metal stoichiometries and revealed that all the amidate ligands coordinate to the aluminium ion in a κ2 fashion. The Al–amidate complexes 2–4 were viable catalyst precursors for the Meerwein–Ponndorf–Verley–Oppenauer reduction–oxidation manifold, successfully interconverting several classes of carbonyl and alcohol substrates.

X-ray powder diffraction analysis of the heteropoly-molybdate (MoO2)0.5PMo14O42

2003 ◽  
Vol 18 (3) ◽  
pp. 236-239 ◽  
Author(s):  
L. Marosi ◽  
J. Cifré ◽  
C. Otero Areán
Keyword(s):  
Catalytic Activity ◽  
Diffraction Analysis ◽  
Computer Modeling ◽  
Powder Diffraction ◽  
Rietveld Analysis ◽  
Nitrogen Atmosphere ◽  
Unit Cell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Patterns

The new heteropoly blue compound (MoO2)0.5PMo14O42, which is relevant in the context of catalytic activity of heteropoly-molybdates, was prepared by controlled thermolysis of (NH4)3PMo12O40 at 730 K in a nitrogen atmosphere. Powder X-ray diffraction analysis showed that this compound has a cubic unit cell, space group Pn3m (No. 224), with ao=11.795(2) Å, Z=2 and DXR=4.2466 g cm−3. Computer modeling and Rietveld analysis of powder diffraction patterns led to a proposed structure of the corresponding Keggin-cage unit PMo14O42.

π-Olefin-Iridium-Komplexe, XIII [1] Neuartige metallzentrierte Verknüpfung zweier Tolan-Moleküle / π-Olefin Iridium Complexes, XIII [1] Novel Metal-Centered Linkage of Two Tolane Molecules

1986 ◽  
Vol 41 (1) ◽  
pp. 76-78 ◽  
Author(s):  
Jörn Müller ◽  
Matthias Tschampel ◽  
Joachim Pickardt
Keyword(s):  
Diffraction Analysis ◽  
Spectroscopic Methods ◽  
Iridium Complexes ◽  
X Ray Diffraction ◽  
Methyl Group ◽  
X Ray

Reaction of [(cod)IrI]2 (cod = 1,5-cyclooctadiene) with methyllithium in the presence of diphenylacetylene (tolane) yields a (cod)Ir complex (3) with a 1-benzyl-2.3-diphenyl-7-methyl-indenyl ligand which is formed by a novel cyclization of two tolane units with participation of a methyl group. The compound was characterized by spectroscopic methods and by X-ray diffraction analysis.

scholarly journals Yttrium and Lithium Keto-β-Diketiminate Complexes [{2,6-Me2C6H3N=C(Me)}2CС(tert-Bu)=O]2Y(μ2-Cl)2Li(THF)2 and {[{2,6-Me2C6H3N=C(Me)}2CС(tert-Bu)=O]Li(THF)}n. Synthesis, Molecular Structures, and Catalytic Activity in ε-Caprolactone Polymerization

2021 ◽  
Vol 47 (2) ◽  
pp. 144-154
Author(s):  
G. G. Skvortsov ◽  
A. V. Cherkasov ◽  
D. L. Vorozhtsov ◽  
E. S. Shchegravina ◽  
A. A. Trifonov
Keyword(s):  
Catalytic Activity ◽  
Diffraction Analysis ◽  
Exchange Reaction ◽  
Ring Opening ◽  
Crystalline State ◽  
Ring Opening Polymerization ◽  
Molecular Structures ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
X Ray

Abstract The reaction of lithium β-diketiminate [{2,6-Me2C6H3N=CMe}2CH]Li with benzophenone in toluene at 25°C affords the coordination complex [{2,6-Me2C6H3N=CMe}2CH]Li(Ph2C=O) (I). New keto-β-diketimine {2,6-Me2C6H3N=C(Me)}2CHC(tert-Bu)=O (II) is synthesized by the reaction of tert-Bu(C=O)Cl with [{2,6-Me2C6H3N=CMe}2CH]Li. The metallation of keto-β-diketimine II with n-butyllithium in THF at 0°C gives lithium keto-β-diketiminate {[{2,6-Me2C6H3N=C(Me)}2CС(tert-Bu)=O]Li(THF)}n (III). The exchange reaction of YCl3 with compound III (molar ratio 1 : 2, THF) affords the yttrium bis(keto-diketiminate) complex [{2,6-Me2C6H3N=C(Me)}2CС(tert-Bu)=O]2Y(μ2-Cl)2L-(THF)2 (IV). The molecular structures of complexes I, III, and IV are determined by X-ray diffraction analysis (CIF files CCDC nos. 2001131 (I), 2001132 (III), and 2001133 (IV)). Complex IV in the crystalline state exists as an ate complex with one LiCl molecule. Complexes I, III, and IV are catalysts of ring-opening polymerization of ε-caprolactone in toluene at 25°С.

scholarly journals Synthesis of Novel Heteroleptic Oxothiolate Ni(II) Complexes and Evaluation of Their Catalytic Activity for Hydrogen Evolution

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 401
Author(s):  
Fotios Kamatsos ◽  
Kostas Bethanis ◽  
Christiana A. Mitsopoulou
Keyword(s):  
Catalytic Activity ◽  
Catalytic Properties ◽  
Spectroscopic Methods ◽  
Electrochemical Studies ◽  
X Ray Diffraction ◽  
Neutral Form ◽  
Proton Reduction ◽  
X Ray ◽  
Better Than

Two heteroleptic nickel oxothiolate complexes, namely [Ni(bpy)(mp)] (1) and [Ni(dmbpy)(mp)] (2), where mp = 2-hydroxythiophenol, bpy = 2,2′-bipyridine and dmbpy = 4,4′-dimethyl-2,2′-bipyridine were synthesized and characterized with various physical and spectroscopic methods. Complex 2 was further characterized by single crystal X-ray diffraction data. The complex crystallizes in the monoclinic P 21/c system and in its neutral form. The catalytic properties of both complexes for proton reduction were evaluated with photochemical and electrochemical studies. Two different in their nature photosensitizers, namely fluorescein and CdTe-TGA-coated quantum dots, were tested under various conditions. The role of the electron donating character of the methyl substituents was revealed in the light of the studies. Thus, catalyst 2 performs better than 1, reaching 39.1 TONs vs. 4.63 TONs in 3 h, respectively, in electrochemical experiments. In contrast, complex 1 is more photocatalytically active than 2, achieving a TON of over 6700 in 120 h of irradiation. This observed reverse catalytic activity suggests that HER mechanism follows different pathways in electrocatalysis and photocatalysis.

scholarly journals Jatroidaine A: a New Tetranortirucallane Type Triterpene from Jatropha multifida

2021 ◽  
Vol 15 (5) ◽  
pp. 408-413
Author(s):  
Fei Li ◽  
Liang Ma ◽  
Jinyuan Zhang ◽  
Xueling Qiao ◽  
Dingshan Zhang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
Absolute Configuration ◽  
Thioredoxin Reductase ◽  
Spectroscopic Methods ◽  
Significant Activity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Inhibitory Activities ◽  
Jatropha Multifida

Jatroidaine A (1), a new tetranortirucallane-type triterpene, and two known analogues (2−3) were isolated from the leaves and branches of Jatropha multifida. Their structures were fully elucidated by extensive spectroscopic methods and comparison to known compounds. The absolute configuration of 1 was assigned by single-crystal X-ray diffraction analysis. All compounds were evaluated for their anti-inflammatory and thioredoxin reductase (TrxR) inhibitory activities. Unfortunately, no significant activity was observed.

Large interaction energy for the homodimer and the heterodimer extracted from the supramolecular chain of a bent trinuclear zinc(II) complex with a reduced Schiff base ligand

2022 ◽  
Author(s):  
Mainak Karmakar ◽  
Rosa M. Gomila ◽  
Antonio Frontera ◽  
Shouvik Chattopadhyay
Keyword(s):  
Schiff Base ◽  
Diffraction Analysis ◽  
Schiff Base Ligand ◽  
Zinc Complex ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
Amino Groups ◽  
X Ray ◽  
Reduced Schiff Base ◽  
Large Interaction

A bent trinuclear zinc complex, [Zn{ZnIL}2]•DMF {H2L = 2,2'-[(2,2-Dimethyl-1,3-propanediyl)bis(iminomethylene)]bis[6-methoxyphenol]} was synthesized and characterized by standard spectroscopic methods and X-ray diffraction analysis. The existence of coordinated amino groups and iodide counter...

Bis/tris[octakis(hexylthio)phthalocyaninato] europium(III) complexes: structure, spectroscopic, and electrochemical properties

2013 ◽  
Vol 17 (08n09) ◽  
pp. 673-681 ◽  
Author(s):  
Chunhua Huang ◽  
Yi Zhang ◽  
Junshan Sun ◽  
Yongzhong Bian ◽  
Dennis P. Arnold
Keyword(s):  
Cyclic Voltammetry ◽  
Ir Spectroscopy ◽  
Diffraction Analysis ◽  
Electrochemical Properties ◽  
Electronic Absorption ◽  
Elemental Analysis ◽  
Molecular Structures ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
X Ray

Bis/tris(phthalocyaninato) europium double- and triple-decker complexes Eu [ Pc (β- SC 6 H 13)8]2 (1) and Eu 2[ Pc (β- SC 6 H 13)8]3 (2) [ Pc (β- SC 6 H 13)8 = 2, 3, 9, 10, 16, 17, 23, 24-octakis(hexylthio)phthalocyaninate] have been synthesized and characterized by a series of spectroscopic methods including mass, NMR, electronic absorption and IR spectroscopy in addition to elemental analysis. Their molecular structures have been determined by single crystal X-ray diffraction analysis and electrochemical properties studied by cyclic voltammetry.

scholarly journals 5α,8α-Epidioxysterols from a Formosan Sponge, Axinyssa sp

2013 ◽  
Vol 8 (11) ◽  
pp. 1934578X1300801
Author(s):  
Tzu-Rong Su ◽  
Kai-Ju Liang ◽  
Michael Y. Chiang ◽  
Mei-Chin Lu ◽  
Yu-Jen Wu ◽  
...  
Keyword(s):  
Single Crystal ◽  
Diffraction Analysis ◽  
Cell Lines ◽  
Cancer Cell ◽  
Absolute Configuration ◽  
Cancer Cell Lines ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Time

One new 5α,8α-epidioxysterol, 3-acetylaxinysterol (1), along with one known sterol, axinysterol (2), were isolated from a Formosan sponge, Axinyssa sp.. The structures of the compounds were determined by spectroscopic methods and the absolute configuration of 2 was further confirmed by single-crystal X-ray diffraction analysis for the first time. Compound 2 exhibited significant cytotoxicity against K562 and Molt 4 cancer cell lines.

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