Decomposition and addition reactions of organic azides

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The ET molecules form dimers where adjacent pairs are rotated by approximately 90 ° with respect to each other and ~ 45 ° with respect to the b and c axes (Fig. 15b). Between neighboring ET sheets the anions, here V-shaped Cu(NCS)~-, form a separating insulation layer. In n-(ET)2Cu(NCS)2 the anions are weakly connected via Cu-S bonds forming polymer-like zig-zag chains. Due to this V shape of the oriented anions there is no center of symmetry leading to a P21 space group for n-(ET)2Cu(NCS)2. Other n-phase salts such as ~-(ET)213 have centrosymmetric anions and correspondingly their crystal structure belongs to the P21/c space group [139].

19a). Of course, also in ~-(ET)213 small gaps due to Bragg reflections at the zone boundary exist. This gap, however, is considerably smaller than in the former salt, although it is observable in dHvA and SdH experiments (see below). Due to the gap opening the FS consists of a closed hole-like orbit and two open corrugated sheets [164], giving rise to an observable in-plane anisotropy of these quasi-2D materials. , by optical reflectivity measurements [165]. It should be noted here that the overall shape of the ~-phase FS can also be obtained by a simple free-electron treatment.

Except for the mentioned ab initio band-structure calculations by Kfibler et al. [159, 160] the overlap and transfer integrals, t±, perpendicular to the highly conducting planes are neglected. Therefore, the band structures shown are 2D bands with a cylindrical FS. However, a remaining overlap and a weak dispersion in the third spatial direction (not always c, depending on the crystal structure) should exist in principle. Indeed, in a variety of different experiments, the influence of the very weak transfer integrals could be detected.

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