L. Zorina

Molecular metals based on radical cation salts of ET and some its analogues with the photochromic nitroprusside anion, [Fe(CN)5NO]2-

Abstract A series of electroconducting radical cation salts based on ET, BEDO and EDT with the photochromic nitroprusside anion has been synthesized. Their crystal structures and transport properties have been studied. The salts of the (ET) 4 M[Fe(CN) 5 NO] 2 (M=Na,K,NH 4 ,Tl,Rb,Cs) composition are isostructural and exhibit metallic behaviour down to helium temperatures.

Structure and magnetic properties of ionic compound (Cp*2Cr+)·(FeIPc−)·(C6H4Cl2)4 containing negatively charged iron phthalocyanine

A new strategy for the preparation of molecular magnets by the reduction of phthalocyanines with strong metallocene donors has been suggested. Compound (Cp*2Cr+)·(FeIPc−)·(C6H4Cl2)4 (1) contains uniform stacks of alternating closely packed Cp*2Cr+ and FeIPc− ions. 1 is a soft ferrimagnet showing hysteresis with a small coercive field and a bifurcation temperature of about 5 K.

Structure and magnetotransport properties of the new quasi-two-dimensional molecular metal β″-(BEDT-TTF)4H3O[Fe(C2O4)3] · C6H4Cl2

The β″-(BEDT-TTF)4AI[MIII(C2O4)3] · G(AI=NH4+, H3O+, K+, Rb+; MIII=Fe, Cr; G = “guest” solvent molecule) family of layered molecular conductors with magnetic metal oxalate anions exhibits a pronounced dependence of the conducting properties on the type of neutral solvent molecules introduced into the complex anion layer. A new organic dichlorobenzene (C6H4Cl2)-containing conductor of this family, namely, β″-(BEDT-TTF)4H3O[Fe(C2O4)3] · C6H4Cl2, is synthesized. The structure of the synthesized single crystals studied by X-ray diffraction is characterized by the following parameters: a = 10.421(1) Å, b= 19.991(2) Å, c= 35.441(3) Å, β = 92.87(1)°, V= 7374(1) Å3, space groupC2/c, and Z = 4. In the temperature range 0.5&2-300 K, the conductivity of the crystals is metallic without changing into a superconducting state. The magnetotransport properties of the crystals are examined in magnetic fields up to 17 T at T = 0.5 K. In fields higher than 10 T, Shubnikov-de Haas oscillations are detected, and the Fourier spectrum of these oscillations contains two frequencies with maximum amplitudes of about 80 and 375 T. The experimental results are compared with the related data obtained for other phases of this family. The possible structural mechanisms of the effect of a guest solvent molecule on the transport properties of the β″-(BEDT-TTF)4AI[MIII(C2O4)3] · G crystals are analyzed.

Structure-properties relationships in organic molecular conductors based on radical cation salts with octahedral metal complexes as counterions

As a part of our general approach in the study of new hybrid molecular materials combining conducting properties with other physical phenomena, we analyze crystal structures and properties of radical cation salts with the photochromic metal mononitrosyl complexes and magnetic metal oxalates as counterions. A detailed comparative crystallochemical analysis of such materials coupled with calculation of their electronic band structures should allow us to conceive a scenario for the rational search of novel hybrid functional materials.