Segregated stacks

Salts with Segregated Stacks and Other Structures. 136... 

In the salts based on segregated stacks of metallocenium-based cations with [M(mnt)2)] (M = Ni, Pd and Pt) anions, the anionic stacks are isolated from each other by the cations in a few compounds these stacks are regular (at high temperatures) but in most cases the [M(mnt)2)] units form dimers. The magnetic behavior of these compounds is dominated by the AF interactions between the anion units. 

The crystal structure of [Fe(Cp)2]2[Ni(mnt)2]2[Fe(Cp)2] is composed by segregated stacks of pairs of cations, [Fe(Cp)2]+, and zig-zag dimerized anions stacks, with a neutral [Fe(Cp)2] molecule laying beside each anionic dimer [65]. In the case of [Co(Cp)2][Ni(dmit)2], the crystal structure consists of layers composed by two types of chains formed by the [Ni(dmit)2] anions, through short S—S contacts. Cation pairs are located between the anionic stacks [68], In the crystal structure of [Co(Cp)2][Ni(dmit)2]3 2MeCN, the partially oxidized anions form... 

HOMO of DBTTF and the LUMO of TCNQ, respectively (Fig. 4b). Source and drain electrodes are several organic metals of the TTF TCNQ type having different chemical potentials predicted using Fig. 4c which is the same as Fig. 2a. For the electrodes whose chemical potentials are set within the conduction band of the channel material, FET exhibited n-type behavior (A in Fig. 4d). When the chemical potentials of organic metals are allocated within or near the valence band of the channel, p-type behaviors were observed (E, F in Fig. 4d). When the chemical potentials of the electrodes are within the gap of the channel, FET exhibited ambipolar-type behavior (B-D in Fig. 4d). Since the channel material is the alternating CT solid, the drain current is not excellent and a Mott type insulator of DA type or almost neutral CT solid having segregated stacks is much preferable in this context. 

Fig. 7 Crystal structure of (CHC )(TCNQ) salt, (a) Uniform segregated stacks of CHC and TCNQ. (b) CHC ribbons by complementary hydrogen bonds and TCNQ form a layer within a bc-plane (hydrogen bonds red dotted lines), (c) Formation of three-dimensional structure (//a) between hemiprotonated cytosine pair and RTCNQ species...

Figure 1 Relationship of donor and acceptor molecules in charge transfer complexes (a) mixed stacks of alternating donor and acceptor molecules in a normal charge transfer complex (b) segregated stacks of donor and acceptor molecules in (TTF)(TCNQ) and related materials...

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