2007年6月1日 · In the present paper, we describe 1D P 31 NMR, P 31 relaxation analysis, NOE difference spectroscopy, and pulsed-field gradient (PFG) NMR to systematically investigate the content and dynamics of hexafluorophosphate dopant ions (PF 6 −) inside the PPy films as a function of oxidation state (during the course of actuation).

Chemical Shift Table For certain compounds, the listed chemical shift pertains to the F shown in bold. The primary references for these values are: 2) Compilation of reported F19 NMR chemical shifts, 1951 to mid-1967 by Claude H. Dungan and John R. Van Wazer.

The six fluorines are all equivalent in the [PF 6] - anion and so the 31 P NMR spectrum consists of a septet. The separation between any adjacent pair of peaks is the P-F coupling constant, in this case 711 Hz. Since all six fluorine nuclei are equivalent they couple to just the phosphorus nucleus to give a doublet, again separated by 711 Hz.

Pure lithium hexafluorophosphate (LiPF6) was successfully prepared at room temperature (23 degrees C) by introducing fluorine gas into a reactor containing LiF and P at -196 degrees C. The...

1993年3月15日 · In this work we investigate the nature of the PF6- ion in electrochemically prepared polypyrrole at various levels of oxidation using 19F and 31p NMR. EXPERIMENTAL Polypyrrole films were prepared from acetonitrile solutions (BDH, HPLC grade) containing 0.09M tetramethyl ammonium hexafluorophosphate* (Aldrich) and 0.1M freshly distilled pyrrole ...

The equivalent ratio of imidazolium units and PEG segments was confirmed by 1 H NMR characterization. Four different triplet peaks of CH2-X (X = N + or O) are observed at δ 3.6-4.2, as shown in...

1983年1月1日 · HPO 2 F 2 gives rise to H 2 PO 3 F and HF (with smaller amounts of PF 6 also present). The 31 P NMR spectrum of P 4 O 10 in HDA exhibits four resonances assigned to P (OH) 4+, H 4 P 2 O 7, (HPO 3) 4 and a mixture of cyclic and …

2007年6月1日 · We present a 13C NMR study of polythiophene, polypyrrole and polyaniline. The results have been obtained by cross-polarization with proton decoupling and magic angle sample spinning techniques.

2008年6月11日 · PGSE diffusion and 19 F, 1 H HOESY NMR studies for a series of PF 6 salts in dichloromethane are presented. The extent of the ion pairing and the relative positions of the ions are shown to depend on the structure of the salt (an example is shown here).

1999年2月19日 · A complete 13 C NMR characterization of two linear low-density polyethylenes (LLDPE), one highly branched and the other lowly branched, is presented. These LLDPE were synthesized with a new catalyst: the [η 3 -methallyl-nickel-dad]PF 6 complex by homopolymerization of ethylene, using different experimental conditions.