scholarly journals Ion Transport Properties and Ionicity of 1,3-Dimethyl-1,2,3-Triazolium Salts with Fluorinated Anions

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1723 ◽  
Author(s):  
Martin Pulst ◽  
Yury Golitsyn ◽  
Detlef Reichert ◽  
Jörg Kressler
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Nmr Spectroscopy ◽  
Diffusion Coefficients ◽  
Important Class ◽  
Spectroscopy Data ◽  
Ion Conductivities ◽  
Electrochemical Devices ◽  
Pfg Nmr ◽  
Conductive Properties ◽  
Triazolium Salts

1,2,3-Triazolium salts are an important class of materials with a plethora of sophisticated applications. A series of three novel 1,3-dimethyl-1,2,3-triazolium salts with fluorine, containing anions of various size, is synthesized by methylation of 1,2,3-triazole. Their ion conductivity is measured by impedance spectroscopy, and the corresponding ionicities are determined by diffusion coefficients obtained from 1H and 19F pulsed field gradient nuclear magnetic resonance (PFG NMR) spectroscopy data, revealing that the anion strongly influences their ion conductive properties. Since the molar ion conductivities and ionicities of the 1,3-dimethyl-1,2,3-triazolium salts are enhanced in comparison to other 1,2,3-triazolium salts with longer alkyl substituents, they are promising candidates for applications as electrolytes in electrochemical devices.

scholarly journals Effect of PAMAM Dendrimers on Interactions and Transport of LiTFSI and NaTFSI in Propylene Carbonate-Based Electrolytes

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1595
Author(s):  
Rafał Konefał ◽  
Zuzana Morávková ◽  
Bartosz Paruzel ◽  
Vitalii Patsula ◽  
Sabina Abbrent ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Raman Spectroscopy ◽  
Propylene Carbonate ◽  
Diffusion Coefficients ◽  
Pamam Dendrimers ◽  
Conductivity Measurements ◽  
Ions Transport ◽  
All Solutions ◽  
Lithium Diffusion ◽  
Pfg Nmr

Poly(amidoamine) (PAMAM)-based electrolytes are prepared by dissolving the PAMAM half-generations G1.5 or G2.5 in propylene carbonate (PC), either with lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) or sodium bis(trifluoromethylsulfonyl)imide (NaTFSI) salts. The solutions, designed for ion battery applications, are studied in terms of ions transport properties. Raman Spectroscopy reveals information about the interactions between cations and PAMAM dendrimers as well as full dissociation of the salts in all solutions. Pulsed-field gradient Nuclear Magnetic Resonance (PFG NMR), measured as a function of both temperature and PAMAM concentration, are obtained for the cation, anion, solvent, and dendrimer molecules using lithium (7Li), sodium (23Na), fluorine (19F), and hydrogen (1H) NMR, respectively. It was found that lithium diffusion is slow compared to the larger TFSI anion and decreases with PAMAM concentration due to interactions between cation and dendrimer. Comparison of conductivities calculated from diffusion coefficients using the Nernst–Einstein equation, with conductivity measurements obtained from Impedance Spectroscopy (IS), shows slightly higher IS conductivities, caused among others by PAMAM conductivity.

What use for polysilsesquioxane lithium salts in lithium batteries?

2016 ◽  
Vol 40 (9) ◽  
pp. 7657-7662
Author(s):  
Mathieu Meyer ◽  
Lydie Viau ◽  
Ahmad Mehdi ◽  
Sophie Monge ◽  
Patrick Judeinstein ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Nmr Spectroscopy ◽  
High Molecular Weight ◽  
Lithium Batteries ◽  
Diffusion Coefficients ◽  
Transference Numbers ◽  
Lithium Salts ◽  
Self Diffusion ◽  
Acetonitrile Solutions ◽  
Pfg Nmr

High molecular weight polysilsesquioxane lithium salts were prepared. Ion self-diffusion coefficients and transference numbers in acetonitrile solutions were quantified by PFG NMR spectroscopy.

scholarly journals Photoreactivity of an Exemplary Anthracene Mixture Revealed by NMR Studies, including a Kinetic Approach

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6695
Author(s):  
Kristina Kristinaityte ◽  
Mateusz Urbańczyk ◽  
Adam Mames ◽  
Mariusz Pietrzak ◽  
Tomasz Ratajczyk
Keyword(s):  
Molecular Structure ◽  
Nuclear Magnetic Resonance ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Kinetic Model ◽  
Important Class ◽  
Crucial Importance ◽  
Nmr Studies ◽  
Experimental Conditions ◽  
Material Sciences

Anthracenes are an important class of acenes. They are being utilized more and more often in chemistry and materials sciences, due to their unique rigid molecular structure and photoreactivity. In particular, photodimerization can be harnessed for the fabrication of novel photoresponsive materials. Photodimerization between the same anthracenes have been investigated and utilized in various fields, while reactions between varying anthracenes have barely been investigated. Here, Nuclear Magnetic Resonance (NMR) spectroscopy is employed for the investigation of the photodimerization of two exemplary anthracenes: anthracene (A) and 9-bromoanthracene (B), in the solutions with only A or B, and in the mixture of A and B. Estimated k values, derived from the presented kinetic model, showed that the dimerization of A was 10 times faster in comparison with B when compounds were investigated in separate samples, and 2 times faster when compounds were prepared in the mixture. Notably, the photoreaction in the mixture, apart from AA and BB, additionally yielded a large amount of the AB mixdimer. Another important advantage of investigating a mixture with different anthracenes is the ability to estimate the relative reactivity for all the reactions under the same experimental conditions. This results in a better understanding of the photodimerization processes. Thus, the rational photofabrication of mix-anthracene-based materials can be facilitated, which is of crucial importance in the field of polymer and material sciences.

Pulsed-field gradient nuclear magnetic resonance measurements (PFG NMR) for diffusion ordered spectroscopy (DOSY) mapping

The Analyst ◽  
2017 ◽  
Vol 142 (20) ◽  
pp. 3771-3796 ◽  
Author(s):  
G. Pagès ◽  
V. Gilard ◽  
R. Martino ◽  
M. Malet-Martino
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Field Gradient ◽  
Intermolecular Interactions ◽  
Diffusion Coefficients ◽  
Multicomponent Systems ◽  
Pulsed Field ◽  
Chemical Systems ◽  
Dosy Nmr ◽  
Pfg Nmr

The advent of Diffusion Ordered SpectroscopY (DOSY) NMR has enabled diffusion coefficients to be routinely measured and used to characterize chemical systems in solution. Indeed, DOSY NMR allows the separation of the chemical entities present in multicomponent systems and provides information on their intermolecular interactions as well as on their size and shape.

Conductivity Studies of Schiff Base Ligands Derived from O-Phenylenediamine and Their Co(II) and Zn(II) Complexes

2015 ◽  
Vol 12 (2) ◽  
pp. 13
Author(s):  
Muhamad Faridz Osman ◽  
Karimah Kassim
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Schiff Base ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Impedance Spectroscopy ◽  
Ftir Spectroscopy ◽  
Coordination Complexes ◽  
Frequency Range ◽  
Schiff Base Ligands

The coordination complexes of Co(II) and Zn(II) with Schiff bases derived from o-phenylenediamine and substituted 2-hydroxybenzaldehyde were prepared All compounds were characterized by Fourier transform infrared (FTIR) spectroscopy and Nuclear magnetic resonance (NMR) spectroscopy elemental analyzers. They were analyzed using impedance spectroscopy in the frequency range of 100Hz-1 MHz. LI and L2 showed higher conductivity compared to their metal complexes, which had values of 1.3 7 x 10-7 and 6.13 x 10-8 S/cm respectively. 

Biological NMR Spectroscopy

1997 ◽  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
State Of The Art ◽  
Critical Assessment ◽  
Resonance Spectroscopy ◽  
History Of ◽  
Structure Of Proteins

This book presents a critical assessment of progress on the use of nuclear magnetic resonance spectroscopy to determine the structure of proteins, including brief reviews of the history of the field along with coverage of current clinical and in vivo applications. The book, in honor of Oleg Jardetsky, one of the pioneers of the field, is edited by two of the most highly respected investigators using NMR, and features contributions by most of the leading workers in the field. It will be valued as a landmark publication that presents the state-of-the-art perspectives regarding one of today's most important technologies.

Phase diagrams of new lamellar liquid crystalline systems based on 2H NMR spectroscopy data

2021 ◽  
Vol 31 (1) ◽  
pp. 135-136
Author(s):  
Vladimir V. Klochkov ◽  
Ilfat Z. Rakhmatullin ◽  
Sergey V. Efimov ◽  
Alexander V. Klochkov
Keyword(s):  
Nmr Spectroscopy ◽  
Phase Diagrams ◽  
Liquid Crystalline ◽  
2H Nmr ◽  
Spectroscopy Data ◽  
2H Nmr Spectroscopy

Unravelling the dissolution mechanism of polyphosphate glasses by 31P NMR spectroscopy: ligand competition and reactivity of intermediate complexes

2021 ◽  
Author(s):  
Dahiana Andrea Avila Salazar ◽  
Peter Bellstedt ◽  
Atsuhiro Miura ◽  
Yuki Oi ◽  
Toshihiro Kasuga ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Biomedical Applications ◽  
Structural Changes ◽  
31P Nmr ◽  
Dissolution Mechanism ◽  
31P Nmr Spectroscopy ◽  
Glass Dissolution ◽  
Polyphosphate Glasses

Phosphate glass dissolution can be tailored via compositional and subsequent structural changes, which is of interest for biomedical applications such as therapeutic ion delivery. Here, solid-state 31P nuclear magnetic resonance...

scholarly journals Exploring the Structural Chemistry of Pyrophosphoramides: N,N′,N″,N‴-Tetraisopropylpyrophosphoramide

Chemistry ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 149-163
Author(s):  
Duncan Micallef ◽  
Liana Vella-Zarb ◽  
Ulrich Baisch
Keyword(s):  
Crystal Structure ◽  
Mass Spectrometry ◽  
Nuclear Magnetic Resonance ◽  
Hydrogen Bonding ◽  
Nmr Spectroscopy ◽  
Ir Spectroscopy ◽  
Room Temperature ◽  
Intermolecular Hydrogen Bonding ◽  
X Ray Diffraction ◽  
X Ray

N,N′,N″,N‴-Tetraisopropylpyrophosphoramide 1 is a pyrophosphoramide with documented butyrylcholinesterase inhibition, a property shared with the more widely studied octamethylphosphoramide (Schradan). Unlike Schradan, 1 is a solid at room temperature making it one of a few known pyrophosphoramide solids. The crystal structure of 1 was determined by single-crystal X-ray diffraction and compared with that of other previously described solid pyrophosphoramides. The pyrophosphoramide discussed in this study was synthesised by reacting iso-propyl amine with pyrophosphoryl tetrachloride under anhydrous conditions. A unique supramolecular motif was observed when compared with previously published pyrophosphoramide structures having two different intermolecular hydrogen bonding synthons. Furthermore, the potential of a wider variety of supramolecular structures in which similar pyrophosphoramides can crystallise was recognised. Proton (1H) and Phosphorus 31 (31P) Nuclear Magnetic Resonance (NMR) spectroscopy, infrared (IR) spectroscopy, mass spectrometry (MS) were carried out to complete the analysis of the compound.

Sign in / Sign up

Export Citation Format

Share Document