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Here, the first accurate study is presented of the room-temperature and 100 K structures of one of the first organic spin liquids,-(BEDT-TTF) 2 Ag 2 (CN) 3. It is shown that the monoclinic structure determined previously is only the average one. It is shown that the exact structure presents triclinic symmetry with two non-equivalent dimers in the u...
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Context 1
... for the S and E conformations of the ethylene molecule respectively close to those given by Geiser et al. (1991), Hiramatsu et al. (2015). In addition, we observed a twist conformation on each side of the molecule (the S and E conformations, as well as the twist and half-twist ethylene configurations are defined by Pouget et al. (2018) [see also Fig. 2 given by Foury- Leylekian et al. (2018)]. Finally, by analysing the hydrogen bonds between the ethylene groups and the electronegative (N or C) atoms of the anionic stack, we observed that the interaction with the anionic network does not clearly favour one of the two conformations of the ET molecule. This explains the observed ...
Context 2
... with an odd l value, are forbidden. As for the 2 1 screw axis, the Bragg reflections of the 0k0 type with an odd value of k, are forbidden. We have measured several samples. For all the samples, except for one which was very small and had a very weak diffracted signal, we have observed the systematic presence of these forbidden reflections (see Fig. 2). It is important to indicate that the forbidden reflections are observed even at high scattering angles. Thus, they do not originate from a thermal effect, nor from a disorder, but rather from atomic displacements. We can also notice that the breaking of the 2 1 screw axis is attested by the presence of only two reflections (050 and ...
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