Investigation into the Equilibrium of Iridium Catalysts for the Hydroformylation of Olefins by Combining In Situ High-Pressure FTIR and NMR Spectroscopy

ACS Catalysis ◽  
2014 ◽  
Vol 4 (7) ◽  
pp. 2097-2108 ◽  
Author(s):  
Christoph Kubis ◽  
Wolfgang Baumann ◽  
Enrico Barsch ◽  
Detlef Selent ◽  
Mathias Sawall ◽  
...  
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Iridium Catalysts

1-Hexene Hydroformylation with the Rhodium (I) Triphosphane Complex [Rh(CO){PhP(CH2CH2PPh2)2}]PF6: An In Situ Study Using High-Pressure NMR Spectroscopy

1997 ◽  
Vol 130 (11) ◽  
pp. 1633-1641 ◽  
Author(s):  
Claudio Bianchini ◽  
Andrea Meli ◽  
Maurizio Peruzzini ◽  
Francesco Vizza ◽  
Piero Frediani
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
In Situ Study

scholarly journals High-Pressure in Situ 129Xe NMR Spectroscopy: Insights into Switching Mechanisms of Flexible Metal–Organic Frameworks Isoreticular to DUT-49

2019 ◽  
Vol 31 (16) ◽  
pp. 6193-6201 ◽  
Author(s):  
Felicitas Kolbe ◽  
Simon Krause ◽  
Volodymyr Bon ◽  
Irena Senkovska ◽  
Stefan Kaskel ◽  
...  
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Metal Organic Frameworks ◽  
129Xe Nmr ◽  
Metal Organic ◽  
Flexible Metal

scholarly journals In Situ Monitoring of Unique Switching Transitions in the Pressure-Amplifying Flexible Framework Material DUT-49 by High-Pressure 129Xe NMR Spectroscopy

2017 ◽  
Vol 121 (9) ◽  
pp. 5195-5200 ◽  
Author(s):  
Jana Schaber ◽  
Simon Krause ◽  
Silvia Paasch ◽  
Irena Senkovska ◽  
Volodymyr Bon ◽  
...  
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
In Situ Monitoring ◽  
129Xe Nmr ◽  
Flexible Framework

Structural Characterization of Micro- and Mesoporous Carbon Materials Using In Situ High Pressure 129Xe NMR Spectroscopy

2014 ◽  
Vol 26 (10) ◽  
pp. 3280-3288 ◽  
Author(s):  
Martin Oschatz ◽  
Herbert C. Hoffmann ◽  
Julia Pallmann ◽  
Jana Schaber ◽  
Lars Borchardt ◽  
...  
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Structural Characterization ◽  
Mesoporous Carbon ◽  
Carbon Materials ◽  
129Xe Nmr ◽  
Mesoporous Carbon Materials

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.

Unexpected Keto-enol Tautomerism in the Cyclopyridinophane Class Direct and indirect proofs

2008 ◽  
Vol 59 (10) ◽  
Author(s):  
Paul Ionut Dron ◽  
Neculai Doru Miron ◽  
Gheorghe Surpateanu
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
Stable Conformer ◽  
Ph Measurements ◽  
Theoretical Methods ◽  
Nmr Data ◽  
Tautomeric Forms ◽  
New Compounds

The paper presents the synthesis of cyclo (bis-paraquat p-phenylene p-phenylene-carbonyl) tetrakis (hexafluorophosphate), named �CETOBOX�, and the closely related structural determinations. This compound exists in three tautomeric forms. These forms were evidentiated by NMR-data (1H-NMR, TOCSY, COSY, NOESY), UV-Vis spectra coupled with pH measurements and by synthesis. As the �CETOBOX� gives �in situ� only the corresponding monoylide, the synthesis of a new fluorescent indolizine cyclophane has been performed by a 3+2 cycloaddition. All structures of the new compounds presented herein have been established by NMR spectroscopy. Also, theoretical methods (MM3, AM1, AM1-COSMO and B88LYPDFT) have been used to determine the most stable conformer structures.

Catalytic activity of rhodium(I) complexes containing (ω-trimethylsilylalkyl)diphenylphosphines

1980 ◽  
Vol 45 (8) ◽  
pp. 2219-2223 ◽  
Author(s):  
Marie Jakoubková ◽  
Martin Čapka
Keyword(s):  
Catalytic Activity ◽  
Nmr Spectroscopy ◽  
Ir Spectroscopy ◽  
Electron Density ◽  
Phosphorus Atom ◽  
Proton Acceptor ◽  
Trimethylsilyl Group ◽  
Kinetics Of

Kinetics of homogenous hydrogenation of 1-heptene catalysed by rhodium(I) complexes prepared in situ from μ,μ'-dichloro-bis(cyclooctenerhodium) and phosphines of the type RP(C6H5)2 (R = -CH3, -(CH2)nSi(CH3)3; n = 1-4) have been studied. The substitution of the ligands by the trimethylsilyl group was found to increase significantly the catalytic activity of the complexes. The results are discussed in relation to the electron density on the phosphorus atom determined by 31P NMR spectroscopy and to its proton acceptor ability determined by IR spectroscopy.

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