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The V-shape correlation between hvcr and ΔEo,r of the charge transfer complexes is convenient to judge the gross features of the solid state properties. Using this correlation, we found the 3:2 charge transfer complex of bis(ethylenedithio)dithiapyrene (ETDTPY) and dibenzobarrelenotetracyanoquinodimethane (DBBTCNQ) which showed the columnar structure of alternating trimeric stack of the donor and dimeric stack of the acceptor.

The crystal structures of an organic superconductor (BEDT-TTF)2Cu(NCS)2 (Tc=10.4 K) at 298 K and 104 K are determined by X-ray analysis. The packing pattern of donors is nearly analogous to κ-(BEDT-TTF)2I3. The counter anion, Cu(NCS)2−, has no positional disorder and constructs a peculiar sheet where a copper ion is coordinated with a sulfur and two nitrogen atoms to form a one-dimensional polymer with a permanent dipole moment.

(BEDT-TTF)2IAuBr was synthesized and the crystal structure of this material was determined to be of the β″- type, being isomorphous to β″-(BEDT-TTF)2AuBr2. The polarized reflectance spectrum indicates that the electronic structure of this salt is of considerable two-dimensional character.

The crystal structure of 2,5-bis(dicyanomethylene)-2,5-dihydrothienot [3,2-b]thiophene and bis(ethylenedithio) tetrathiafulvalene complex showed a weak face to face interaction and sheet-like networks with intermolecular N···S and S···S interactions, and the shortest S···S contact is 3.48 A between the acceptors.

The two-dimensional strucrture of α-(BEDT-TTF)3(ReO4)2 on the (010) plane is very similar to that of (BEDT-TTF)3(ClO4)2, although the three dimensional structure is quite different from each other. The slight geometrical difference between the crystallographically independent molecules suggests the different formal charge of these molecules.

The crystal structures of methylthio and ethanedithio substituted peri-condensed Weitz type donors, bis(methylthio)dithiapyrene and bis(ethanedithio)dithiapyrene, showed sheet-like networks of dimeric pairs of the donor molecules.

An ambient pressure superconductivity of (BEDT-TTF)2Cu(SCN)2 was observed by d.c. magnetic susceptibility and electrical conductivity measurements. The superconducting critical temperature is the highest (TC=10.4 K) among the organic superconductors so far obtained, even though the anion has a positional disorder in the crystal.

The title complex which is isostructural to e-(BEDT-TTF)2I3 (I8)0.5 changes its conducting property from semiconductive to metallic by tempering with the loss of its weight. This metallic state retains down to 0.5 K and this product is regarded as being different from α- and β-(BEDT-TTF)2IBr2.

Sigle crystals of a metallic (phthalocyaninato)nickel hexafluoro antimonate, (NiPc)2SbF6, were newly prepared by the use of an electrochemical technique. NiPc is stacked one-dimensionally in a slight zigzag way, which quite resembles the structure of highly conducting NiPcI.