A.G. Khomenko

[Ni(dddt)2]3(HSO4)2, the first metal among the M(ddt)2 salts

Abstract The first metal, [Ni(dddt)2]3(HSO4)2, among the class of M(dddt)2 cation salts has been obtained. Its structure and conducting properties have been studied. [Ni(dddt)2]3(HSO4)2 has been found to be isostructural to the (ET)3(HSO4)2 salt and their conducting properties are compared. [Ni(dddt)2]3(HSO4)2 retains its metallic state to lower temperatures (∼ 25 K) than (ET)3(HSO4)2 (∼ 130 K).

Cationic dithiolene metal complexes with 5,6-dihydro-1,4-dithiin-2,3-dithiol: Highly conducting metal complex analogues of BEDT-TTF salts

Abstract A new class of highly conducting compounds (cationic dithiolene metal complexes of Ni and Au with 5,6-dihydro-1,4-dithiin-2,3-dithiol (DDDT), which are metal complex analogues of BEDT-TTF salts) has been obtained. The crystal structure of one of the representatives of this class, [Ni(DDDT) 2 ] 3 (BF 4 ) 2 , has been determined. The crystal contains stacks of [Ni(DDDT) 2 ] cations with shortened intra- and interstack S·S contacts. The conductivity of these complexes at room temperature is 1 – 50 ohm −1 cm −1 .

New class of metal BIS-dithiolene electroconducting solids: Cation complexes of metals with dddt

Abstract Electroconducting solids have been synthesized based on the M(dddt) 2 (M = Ni, Pt, Au) cation complexes, which represent a new class of bis-dithiolene chelates. Their salts are analogs to the ET salts. Crystal structures and conducting properties of [M(dddt) 2 ] π+ salts have been studied and compared with the ET salts.

New organic metal (ET)4 (Hg2Cl6·C6H5Cl): Synthesis, structure, properties

Abstract A new organic twodimensional metal (ET) 4 (Hg 2 Cl 6 ·C 6 H 5 Cl) retaining its metallic state down to 1.5 K has been synthesized. It is characterized with the layer-like structure composed of layers of four crystallographically independent cation-radicals of ET and anion layers formed of (Hg 2 Cl 6 ·C 6 H 5 Cl) dimers, solvent molecules being present in their composition. The dimers are interconnected into a centosymmetric fragment (Hg 2 Cl 6 ·C 6 H 5 Cl) 2 .

Organic metals: ET cation-radical salts with tetrahedral BF4− and HSO4− anions

Abstract Synthesis, crystal structures, and conducting properties of (ET)4 (BF4)2C2H3Cl3, (ET)3(BF4)2, and (ET)3(HSO4)2 are described. The (ET)4(BF4)2C2H3Cl3 salt is a stable metal up to 1.5 K, the other two suffer their metal-dielectric transition in the region of ∼170 and 130 K, respectively.

HIGHLY CONDUCTING COMPLEXES BASED ON AU(III)-BIS(1,3-DITHIO-2-THIONE-4,5-DITHIOLATE)

Abstract A series of highly conducting salts based on Au (III) complexes with dmit have been synthesized. The crystal structures and conducting properties have been studied. A new type of the M( dmit ) 2 salts containing mixed anion [Au( dmit ) 2 TCNQ] − have been obtained.

New cation-radical salts based on BEDT-TTF symmetric analogs with polyhalide anions

Abstract A new series of cation-radical salts based on symmetric BEDT-TTF (ET) analogs, BT, SPT, OPT, CPT, has been synthesized with linear anions I 3 − , IBr 2 − , ICl 2 − . Their crystal structures and conducting properties have been studied. The first cation-radical salt (BT) 2 Cl 2 H 5 O 2 with a new complex anion (Cl 2 H 5 O 2 ) − , which consists of 2Cl − and a hydroxonium ion H 5 O 2 + , has been obtained. The salt is an organic metal with the metal-insulator transition in the region of ≈80 K.

Synthesis, structure and conducting properties of Me4N[Au(dmit)2]2

Abstract The structure and conductivity of the Me4N[Au(dmit)2]2 crystals obtained have been studied. Structures and conducting properties of analogous M(dmit)2 anion complexes with M = Au, Ni and Pd have been compared.

THE FIRST CONDUCTING CATIONIC BIS-DITHIOLENE COMPLEXES OF NICKEL AND GOLD

[Ni(dddt)2]3(BF4) 2 (I) was obtained as a crystalline solid by the electrochemical oxidation of the neutral complex, Ni(dddt) 2 [3-5] in nitrobenzene solution on a platinum anode applying a constant current of 5 ~A/cm 2 at 50 C. Et4NBF 4 was used as the electrolyte. The unit cell parameters of the monoclinic crystals at 295=K are as follows: a 15.998(2), b = ii.946(I), c 24.281(2) A, ~ 90.161(8) ~ V 4640.6(8) A 3 Z 4(C24H24FsNi3BzS24) space group P21/C. The structure of (I) features regular Ni(dddt) 2 stacks with short intrastack and interstack S..-S contacts of 3.45-3.68 A. Due to the latter, the stacks in the crystals form Ni(dddt) z layers in the bc planes, which alternate along the a-axis with BF 4 anion layers. The conductivity of (I) at -20~ is i ~-1.cm-1. [Au(dddt)2] + salts with BF 4, CI04, and IBr z anions were obtained by the electrochemical oxidation of neutral Au(dddt)2[2 ] . The conductivity of these salts is 10-50 ~-1.cm -I. M(dddt)2 cationic salts hold great interest since they are metal complex analogs of organic superconductors of the BEDT-TTF radicalcation salt family [6].

Electrochemical synthesis of tetraseleno-tetracene chloride (TSeT)2Cl, an organic metal, and characteristics of its conducting properties

ConclusionsElectrocrystallization in benzonitrile permits obtaining single crystals of the quasi-one-dimensional organic metal (TSeT)2Cl with a high degree of perfection. A nonmonotonic change of the resistance in the temperature range below the metal-semimetal transition was detected for the first time on these crystals.