L. A. Kushch

Band structure and Fermi surface of the (BEDT-TTF)4M[Fe(CN)5NO]2 (M=Na, K, Rb,…) molecular metals containing the photochromic nitroprusside anion

Abstract Tight-binding band structure calculations for the room temperature crystal structure of the new family of (BEDT-TTF)4M[Fe(CN)5NO]2 (M=Na, K, Rb, NH4, Cs, Tl) salts are reported. It is shown that the Fermi surface of these salts contains two contributions: (a) a strongly warped non-nested open part and (b) a contribution which can be open or closed depending on minor changes in the donor–donor interactions which in either case exhibits well-nested portions. Because of these features, the pressure dependence of both the magnetoresistance measurements and the possible occurrence of density wave instabilities would be very interesting to study.

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.

Synthesis, structure, and electroconductivity of new radical cation salt [Pd(dddt)2]2GaBr4

A new radical cation salt based on the dithiolate complex Pd(dddt)2 (dddt=5,6-dihydro-1,4-dithiine-2,3-dithiolate) with the tetrahedral anion [GaBr4]− was synthesized. The crystal and molecular structure was determined by XRD analysis. The crystal structure of the salt contains Pd(dddt)2 cation layers alternating with layers of [GaBr4]− anions along thec axis of the unit cell. The cation layers contain stacks of Pd(dddt)2, with a Pd...Pd distance of 3.011 Å. The electroconductivity of [Pd(dddt)2]2GaBr4, single crystals at room temperature is 0.25 Ohm−1 cm−1 and decreases with temperature decrease, the activation energy beingEa=0.66 eV.

A perylene complex with a one-dimensional coordination polymer containing [Mn6O2(CHCl2COO)10(H2O)2] cluster units linked by 3,10-perylenequinone bridges

The crystals of a perylene complex with the polymeric cluster containing [Mn6O2(O2CCHCl2)10(H2O)2] units assembled by 3,10-perylenequinone bridges, {[Mn6O2(O2CCHCl2)10(H2O)2(C20H10O2)]2n·(C20H12)n} (I), were obtained in the reaction of [Mn12O12(O2CCHCl2)16(H2O)4] with perylene. Unlike the Mn12 oxodichloroacetate cluster, the reaction of the Mn12 oxobenzoate cluster, [Mn12O12(O2CPh)16(H2O)4], with perylene does not occur. However, it turned out that the crystals isolated from the reaction are a new Mn12 oxobenzoate cluster containing three molecules of coordinated H2O and solvate molecules of hexane, [Mn12O12(O2CC6H5)16(H2O)3]·2C6H12 (II). Crystal structures of complexes I and II as well as the magnetic properties of the former were studied.