On the Electrical Conductivity of Violanthrone, Iso-Violanthrone, and Pyranthrone

Abstract

Violanthrone, iso-violanthrone, and pyranthrone have electrical conductance to a certain degree. This is due to the molecular structure of these compounds, which are made of the network planes of carbon atoms, and to the assumption that the π-electron contribute to the electrical conduction. The electrical resistivity of violanthrone, iso-violanthrone, and pyranthrone was measured. The values at 15°C are as follows; 2.3×1010 ohm-cm, 5.7×109 ohm-cm, and 3.9×1015 ohm-cm respectively. The resistivity decreases with increasing temperature in every case, and a good linear relationships is observed between the logarithm of the resistivity and the reciprocal of the temperature. As the activation energy of the electrical conductance, the following values were observed; 0.39 ev, 0.375 ev, and 0.53 ev respectively. The values for violanthrone and iso-violanthrone suggest that they can be assumed to be intrinsic semi-conductors.

Conductivity and Energy Gap Measurements of Some Relatives of Phthalocyanine

“…The importance of the Figure 8 shows that both the slope and conductivity for the 350 ~ polymer lie between respective data for the 250 ~ polymer and the monomer copper-phthalocyanine. The comparison of the band gaps of the three compounds shows that they are subject to an expected decreasing sequence (7)(8)(9)(10).…”

Single-Component Molecular Conductors

“…(2) In the systems with crossing bands, large HOMO-HOMO and LUMO-LUMO transverse interactions are necessary to stabilize the metallic state. The dithiolene complex molecules with extended-TTF ligands are the suitable molecules to satisfy these requirements.…”

“…Around 1950, D. D Eley discovered the semiconducting properties of metal-free phthalocyanine and copper phthalocyanine, well fitted in the formula q ¼ q o exp E=RT [1] and H. Akamatu and H. Inokuchi pointed out that violanthrone, iso-violanthrone and are semiconductors with resistivities of 10 9 -10 15 ohm cm, whose electrical conductivities were thought to be derived from p-electrons of carbon atoms of the network planes [2]. In 1954, H. Akmatu, H. Inokuchi, Y. Matsunaga reported that perylene-bromine complex was relatively stable and had very good conductivity of 1-10 À3 S cm À1 [3].…”

Convenient Synthesis of 7H-Naphtho-[1,8-gh]quinolin-7-one

“…INTRODUCTION 7H-Benz[de]anthracen-7-one (benzanthrone, Bz) (1a) is a valuable starting material because it gives nanocyclic aromatic compounds by self-condensation, [1] some of which have been used as excellent vat dyes and have been shown to be organic semiconductors [2] or photoconductors. [3] Azabenzanthrone, in which a carbon atom is replaced by a nitrogen atom, may also give polycyclics similar to those of 1a and have significant effects on physical or chemical properties because of the presence of a nitrogen atom.…”