Friday, January 13, 2017

Insight into the Supramolecular Architecture of Intact Diatom Biosilica from DNP-Supported Solid-State NMR Spectroscopy #DNPNMR


Jantschke, A., et al., Insight into the Supramolecular Architecture of Intact Diatom Biosilica from DNP-Supported Solid-State NMR Spectroscopy. Angew Chem Int Ed Engl, 2015. 54(50): p. 15069-73.


Diatom biosilica is an inorganic/organic hybrid with interesting properties. The molecular architecture of the organic material at the atomic and nanometer scale has so far remained unknown, in particular for intact biosilica. A DNP-supported ssNMR approach assisted by microscopy, MS, and MD simulations was applied to study the structural organization of intact biosilica. For the first time, the secondary structure elements of tightly biosilica-associated native proteins in diatom biosilica were characterized in situ. Our data suggest that these proteins are rich in a limited set of amino acids and adopt a mixture of random-coil and beta-strand conformations. Furthermore, biosilica-associated long-chain polyamines and carbohydrates were characterized, thereby leading to a model for the supramolecular organization of intact biosilica.

[NMR] MOOC on NMR, Feb. 20 to Apr. 17, 2017

From the Ampere Magnetic Resonance List



Dear colleagues,

In 2015, the Massive Open Online Course (MOOC) “Nuclear Magnetic Resonance (NMR), a Compass to Nanoworld” hosted on the FUN platform was one of the first MOOCs covering the subject of NMR.

It is our great pleasure to announce that the second! offering of this MOOC is now open for free registration. 

This MOOC in English aims at providing the basic knowledge about NMR and an overview of its applications to students and professionals who want to enter this field.

Topics to be covered include:

• Basic principles and practice of NMR spectroscopy;
• Solution NMR of small molecules;
• NMR of proteins and sugars;
• Basic principles and practice of solid-state NMR spectro scopy;
• NMR characterization of materials (glasses, heterogeneous catalysts, battery materials).

The courses will be held from February 20 to April 17, 2017. For this course, about 2-3 hours of work per week are expected. MOOC participants will learn through video lectures and online discussions with peers and professors. The acquired knowledge will be tested through weekly quizzes.

This course does not require previous knowledge about NMR spectroscopy. Nevertheless, the participants should have a background in basic chemistry (chemical elements, molecular structure) and in basic physics (magnetism, basic spectroscopy).

The teachers of this MOOC are Olivier Lafon (coordinator), Cédric Lion, Emmanuel Maes, Frédérique Pourpoint, Robert Schneider and Julien Trébosc. They belong to the University of Lille and the CNRS. The University of Lille is part o f the French network of high-field NMR facilities (http://www.ir-rmn.f! r/) and hosts 800 and 900 MHz NMR spectrometers for the study of liquids and solids. It has also been selected to host the first 1.2 GHz NMR spectrometer to be installed in France. 

Please distribute this announcement to your students as well as to your colleagues who may be interested.

If you are interested, please register through the website 
You can already watch the MOOC trailer on this website. 

With kind regards,

Olivier Lafon, Cedric Lion, Emmanuel Maes, Frederique Pourpoint, Robert Schneider and Julien Trebosc

-- 
________________________________________________________________
Olivier Lafon
Professor
Department of chemistry
University of Lille – Institut Universitaire de France
F-59652, Villeneuve d'Ascq, Cedex, France
Tel: 33 3 20 43 41 43 Fax : 33 3 20 43 68 14

____________________________________________________ ___________ 

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Wednesday, January 11, 2017

DNP-Enhanced Ultrawideline Solid-State NMR Spectroscopy: Studies of Platinum in Metal-Organic Frameworks #DNPNMR


Kobayashi, T., et al., DNP-Enhanced Ultrawideline Solid-State NMR Spectroscopy: Studies of Platinum in Metal-Organic Frameworks. J Phys Chem Lett, 2016. 7(13): p. 2322-7.


Ultrawideline dynamic nuclear polarization (DNP)-enhanced (195)Pt solid-state NMR (SSNMR) spectroscopy and theoretical calculations are used to determine the coordination of atomic Pt species supported within the pores of metal-organic frameworks (MOFs). The (195)Pt SSNMR spectra, with breadths reaching 10000 ppm, were obtained by combining DNP with broadbanded cross-polarization and CPMG acquisition. Although the DNP enhancements in static samples are lower than those typically observed under magic-angle spinning conditions, the presented measurements would be very challenging using the conventional SSNMR methods. The DNP-enhanced ultrawideline NMR spectra served to separate signals from cis- and trans-coordinated atomic Pt(2+) species supported on the UiO-66-NH2 MOF. Additionally, the data revealed a dominance of kinetic effects in the formation of Pt(2+) complexes and the thermodynamic effects in their reduction to nanoparticles. A single cis-coordinated Pt(2+) complex was confirmed in MOF-253.

Tuesday, January 10, 2017

[NMR] Faculty Position in NMR

From the Ampere Magnetic Resonance List




Dear Colleagues

please note that the Chemistry Department of the Technical University of Dortmund has an open faculty position in bimolecular NMR at the full professor level (W3). Details are available at


or from the head of the search committee, Prof. Roland Winter <roland.winter@tu-dortmund.de>.

Please forward this information to any suitable candidates.

Sincerely,
Dieter Suter


____________________________________________________________________________
Dieter Suter | Tel: (+49 231) 755 3512
Fakultät Physik | Fax: (+49 231) 755 3509
Technische Universität Dortmund |
D-44221 Dortmund | e-mail: Dieter.Suter@tu-dortmund.de
____________________________________________________________________________

Monday, January 9, 2017

19F Dynamic Nuclear Polarization and SEM in Suspensions Consisting of Fluorobenzene Derivatives and Asphaltene Extracted from MC-800 Liquid Asphalt #DNPNMR


Kirimli, H.E. and H. Ovalioglu, 19F Dynamic Nuclear Polarization and SEM in Suspensions Consisting of Fluorobenzene Derivatives and Asphaltene Extracted from MC-800 Liquid Asphalt. Journal of Dispersion Science and Technology, 2014. 35(2): p. 255-264.


A variety of analytical techniques, such as scanning electron microscopy and 19F dynamic nuclear polarization (DNP) methods, are applied to characterize asphaltene extracted from MC-800 liquid asphalt in fluorobenzene derivatives at 1.53 mT and at room temperature. Different solvents show variable affinities for the asphaltene surface. The low field EPR spectrum of the asphaltene/hexafluorobenzene sample was recorded. The DNP parameters were determined. Additionally, the interactions between the nuclei of the solvent and the electrons delocalized on the asphaltene are interpreted. Not only dipolar but also scalar interactions between the nuclear spin and the electron spin were found.

Friday, January 6, 2017

Rational design of dinitroxide biradicals for efficient cross-effect dynamic nuclear polarization #DNPNMR


Kubicki, D.J., et al., Rational design of dinitroxide biradicals for efficient cross-effect dynamic nuclear polarization. Chem. Sci., 2016. 7(1): p. 550-558.


A series of 37 dinitroxide biradicals have been prepared and their performance studied as polarizing agents in cross-effect DNP NMR experiments at 9.4 T and 100 K in 1,1,2,2-tetrachloroethane (TCE). We observe that in this regime the DNP performance is strongly correlated with the substituents on the polarizing agents, and electron and nuclear spin relaxation times, with longer relaxation times leading to better enhancements. We also observe that deuteration of the radicals generally leads to better DNP enhancement but with longer build-up time. One of the new radicals introduced here provides the best performance obtained so far under these conditions.

[NMR] Two Research Fellowships in Southampton, UK, with deadline 19 Jan 2017

From the Ampere Magnetic Resonance List


Dear Colleagues,

There are two open Research Fellowships in Nuclear Magnetic Resonance in my group (http://www.southampton.ac.uk/chemistry/about/staff/pileio.page) at the University of Southampton:

Position #1: Post-Doctoral Research Fellowship in nuclear magnetic resonance in the research group of Dr Giuseppe Pileio, in collaboration with Prof Malcolm H Levitt. The project, funded by EPSRC(UK), concerns the development of hardware and methodology that combines supercritical fluids with long-lived states NMR and dissolution-DNP to prolong the storage of hyperpolarised spin order and allow it to be transported remotely from the production site. The successful candidate will be mainly responsible of the hardware development side of the project and will work together with a PhD student and another Research Fellow, both already appointed. Furthermore, the project is done in partnership with Jasco, a UK based company specialising in supercritical-fluids. The position is tenable from 13 Feb 2017 (or as soon as possible thereafter) with initial appointment for 2 years and there are already enough funds for a further extension of 1 year or more, subject to project requirement!

For further details and how to apply please follow this link: https://jobs.soton.ac.uk/Vacancy.aspx?ref=785816EB-R


Position #2: Post-Doctoral Research Fellowship in nuclear magnetic resonance in the research group of Dr Giuseppe Pileio. The project, funded by EPSRC, concerns the development of NMR methodology to probe translational dynamics in porous media by singlet-state NMR spectroscopy. In particular we are interested in developing new methods for measuring tortuosity in porous media and singlet-state enhanced q-space spectroscopy. The successful candidate will work together with a Project Student and another Research Fellow, both already working on the project. The position is tenable from 13 Feb 2017 (or as soon as possible thereafter) with appointment for 1 year but with the possibility of a further extension of 1 more year, subject to project requirements and mutual interests. For further details and how to apply please follow this link: https://jobs.soton.ac.uk/Vacancy.aspx?ref=785516EB-R

The closing date for both positions is 19 January 2017.

University of Southampton is a UK Russell Group university positioned in the top 1% of world universities according to QS World University Rankings. We have an international reputation for research, teaching and enterprise activities. Southampton is particularly well known for its magnetic resonance and computational chemistry research.


All the best,
Dr. Giuseppe Pileio, PhD

Lecturer in Magnetic Resonance,
Department of Chemistry,
Building 30 - Room 3047,
University of Southampton,
University Road, SO17 1BJ,
Internal Post Code: M16,
Southampton, Hampshire, UK.


Tel.: +44 (023) 80 59 4146<tel:+44%20(023)%2080%2059%204146>

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