Direct Formation of Micro-/Nanocrystalline 2,5-Dimethyl-N,N‘-dicyanoquinonediimine Complexes on SiO₂/Si Substrates and Multiprobe Measurement of Conduction Properties

Abstract

Multiprobe measurements were performed on tiny single crystals of DMe-DCNQI complexes prepared directly on SiO2/Si substrates. The differences in conduction properties between the micro- and nanocrystals and bulk crystals were observed.

UV‐vis‐Induced Vitrification of a Molecular Crystal

“…They were produced under identical conditions either in air, in vacuo, or under an atmosphere of dry nitrogen. Elemental analysis (EA) of c and d indicated that they should have stoichiometries of Ag(DM) 2 and Ag(DM) 1.5 , respectively, consistent with the results of three other experiments (X-ray absorption fine structure (XAFS), 13 C NMR, and thermal analysis). Compared to the starting material a, the DM deficiency in the stoichiometry of in d and e was a result of either sublimation or combustion of the DM molecules, as observed during illumination.…”

“…By selecting the illumination conditions, the metallic conductivity of Ag(DM) 2 was transformed into either semiconductor or insulator conductivity behavior. The electrical conductivity is dependent on the p-electron density in the DM radical anion species of Ag(DM) 2 .…”

“…A substantial part of the work described above has recently been independently confirmed by another research group. [2] A charge-transfer complex of 2,5-dimethyl-N,N′-dicyanoquinonediimine (DM) with silver (crystalline Ag(DM) 2 , defined as a) is irreversibly transformed by UV-vis illumination. Depending on the illumination conditions, three new types of solids (defined as c, d, and e) with different structural and physical properties are obtained and examined by a variety of analytical techniques, including solid-state, high-resolution, cross-polarization magic angle spinning (CP-MAS) 13 C NMR, elemental analysis (EA), mass spectrometry (MS), X-ray absorption fine structure (XAFS), and powder X-ray diffraction (XRD).…”

Development of a Control Method for Conduction and Magnetism in Molecular Crystals

“…93 The same result has been reproduced by an independent group. 119 Rectifying behavior is characteristic behavior of diodes. Diodes are fundamental and thus versatile semiconductor devices.…”

Investigation of Mechanical Agitation in the Dynamics of the Electrochemical Growth of Organic Crystals in a Nanoliter Cell

“…Previous studies of organic crystal growth using either microscale electrodes, [ 14,15 ] confi ned growth volumes, [16][17][18] or both [ 13 ] have reported materials reminiscent in shape to those produced by bulk synthesis. In the case of (TMTSF) 2 ClO 4 , the relevant morphology is rectangular as shown schematically in Figure 2 a (referred to here as type A), with the long axis of the crystal corresponding to the chain direction of the constituent molecules.…”