Roucan, M., M. Kielmann, S. J. Connon, S. S. R. Bernhard, and M. O. Senge. “Conformational Control of Nonplanar Free Base Porphyrins: Towards Bifunctional Catalysts of Tunable Basicity.” Chemical Communications 54, no. 1 (2018): 26–29.
For the first time, free base and N-methylated porphyrins have been utilized as bifunctional organocatalysts in Michael additions and it was found that distortion of the macrocycle is a vital prerequisite for their catalytic activity. Conformational design has been used to tailor the properties of nonplanar porphyrins with regards to availability of the N–H units for hydrogen bonding (distortion-dependent hydrogen bonding) and the basicity of the heterocyclic groups. NMR spectroscopic- and catalyst screening studies provided insight into the likely mode of catalyst action. This unprecedented use of free base and N-substituted porphyrins as organocatalysts opens a new functional role for porphyrins.
High power Continuously Frequency-tunable Terahertz Radiation Sources and Transmission Lines for DNP-enhanced NMR System #DNPNMR
From The DNP-NMR Blog:
High power Continuously Frequency-tunable Terahertz Radiation Sources and Transmission Lines for DNP-enhanced NMR System #DNPNMR
Liu, Diwei, Tao Song, Hao Shen, Jie Huang, Ning Zhang, Chenghai Wang, Wei Wang, and Shenggang Liu. “High Power Continuously Frequency-Tunable Terahertz Radiation Sources and Transmission Lines for DNP-Enhanced NMR System.” In 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 1–2. Nagoya: IEEE, 2018.
https://doi.org/10.1109/IRMMW-THz.2018.8510299.
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02-29-2020 09:52 PM
Natural Abundance 17 O DNP NMR Provides Precise O-H Distances and Insights into the Bronsted Acidity of Heterogeneous Catalysts #DNPNMR
From The DNP-NMR Blog:
Natural Abundance 17 O DNP NMR Provides Precise O-H Distances and Insights into the Bronsted Acidity of Heterogeneous Catalysts #DNPNMR
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Perras, F.A., et al., Natural Abundance 17 O DNP NMR Provides Precise O-H Distances and Insights into the Bronsted Acidity of Heterogeneous Catalysts. Angew Chem Int Ed Engl, 2017. 56(31): p. 9165-9169.
https://www.ncbi.nlm.nih.gov/pubmed/28499071
Heterogeneous Bronsted acid catalysts are tremendously important in industry,...
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11-10-2017 05:01 PM
Dynamic Nuclear Polarization/Solid-State NMR Spectroscopy of Membrane Polypeptides: Free-Radical Optimization for Matrix-Free Lipid Bilayer Samples #DNPNMR
From The DNP-NMR Blog:
Dynamic Nuclear Polarization/Solid-State NMR Spectroscopy of Membrane Polypeptides: Free-Radical Optimization for Matrix-Free Lipid Bilayer Samples #DNPNMR
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Salnikov, E.S., et al., Dynamic Nuclear Polarization/Solid-State NMR Spectroscopy of Membrane Polypeptides: Free-Radical Optimization for Matrix-Free Lipid Bilayer Samples. ChemPhysChem, 2017. 18(15): p. 2103-2113.
https://www.ncbi.nlm.nih.gov/pubmed/28574169
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09-25-2017 08:42 PM
A DNP-supported solid-state NMR study of carbon species in fluid catalytic cracking catalysts #DNPNMR
From The DNP-NMR Blog:
A DNP-supported solid-state NMR study of carbon species in fluid catalytic cracking catalysts #DNPNMR
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Mance, D., et al., A DNP-supported solid-state NMR study of carbon species in fluid catalytic cracking catalysts. Chem Commun (Camb), 2017. 53(28): p. 3933-3936.
https://www.ncbi.nlm.nih.gov/pubmed/28327736
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06-23-2017 04:36 PM
Characterizing Substrate-Surface Interactions on Alumina-Supported Metal Catalysts by Dynamic Nuclear Polarization-Enhanced Double-Resonance NMR Spectroscopy #DNPNMR
From The DNP-NMR Blog:
Characterizing Substrate-Surface Interactions on Alumina-Supported Metal Catalysts by Dynamic Nuclear Polarization-Enhanced Double-Resonance NMR Spectroscopy #DNPNMR
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Perras, F.A., et al., Characterizing Substrate-Surface Interactions on Alumina-Supported Metal Catalysts by Dynamic Nuclear Polarization-Enhanced Double-Resonance NMR Spectroscopy. J Am Chem Soc, 2017. 139(7): p. 2702-2709.
https://www.ncbi.nlm.nih.gov/pubmed/28112506
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06-13-2017 06:55 AM
Atomistic Description of Reaction Intermediates for Supported Metathesis Catalysts Enabled by DNP SENS #DNPNMR
From The DNP-NMR Blog:
Atomistic Description of Reaction Intermediates for Supported Metathesis Catalysts Enabled by DNP SENS #DNPNMR
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Ong, T.C., et al., Atomistic Description of Reaction Intermediates for Supported Metathesis Catalysts Enabled by DNP SENS. Angew Chem Int Ed Engl, 2016. 55(15): p. 4743-7.
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12-23-2016 03:30 PM
Identifying low-coverage surface species on supported noble metal nanoparticle catalysts by DNP-NMR #DNPNMR
From The DNP-NMR Blog:
Identifying low-coverage surface species on supported noble metal nanoparticle catalysts by DNP-NMR #DNPNMR
Johnson, R.L., et al., Identifying low-coverage surface species on supported noble metal nanoparticle catalysts by DNP-NMR. Chem Commun (Camb), 2016. 52(9): p. 1859-62.
http://www.ncbi.nlm.nih.gov/pubmed/26675287
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06-03-2016 04:52 PM
[NMR paper] Conformational heterogeneity of transmembrane residues after the Schiff base reproton
Conformational heterogeneity of transmembrane residues after the Schiff base reprotonation of bacteriorhodopsin: 15N CPMAS NMR of D85N/T170C membranes.
Related Articles Conformational heterogeneity of transmembrane residues after the Schiff base reprotonation of bacteriorhodopsin: 15N CPMAS NMR of D85N/T170C membranes.
FEBS J. 2005 May;272(9):2152-64
Authors: Mason AJ, Turner GJ, Glaubitz C
bR, N-like and O-like intermediate states of methionine-labelled wild type and D85N/T170C bacteriorhodopsin were accumulated in native membranes by...
Conformational control of nonplanar free base porphyrins: towards bifunctional catalysts of tunable basicity #DNPNMR
Linear Mode
