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ABSTRACT: Electrocrystallization of enantiopure (S,S,S,S)- and (R,R,R,R)-tetramethyl-bis(ethylenedithio)-tetrathiafulva?lene (TM-BEDT-TTF) donors, as well as the racemic mixture, in the presence of potassium cations and the tris(chloranilato)- ferrate(III) [Fe(Cl2An)3] 3? paramagnetic anion afforded a complete series of chiral magnetic molecular conductors formulated as β - [ ( S,S,S,S )-TM-BEDT?TTF]3PPh4[KI FeIII(Cl2An)3]·3H2O (1), β-[(R,R,R,R)-TM?BEDT-TTF]3PPh4[KI FeIII(Cl2An)3]·3H2O (2), and β-[(rac)- TM-BEDT-TTF]3PPh4[KI FeIII(Cl2An)3]·3H2O (3). Com?pounds 1?3 are isostructural and crystallize in triclinic space groups (P1 for 1 and 2, P?1 for 3) showing a segregated organic?inorganic crystal structure, where anionic honeycomb layers obtained by self-assembling of the Λ and Δ enantiomers of the paramagnetic complex with potassium cations alternate with organic layers where the chiral donors are arranged in the β packing motif. Compounds 1?3 show a molecular packing strongly influenced by the topology of the inorganic layers and behave as molecular semiconductors with room-temperature conductivity values of ca. 3 × 10?4 S cm?1 . The magnetic properties are dominated by the paramagnetic S = 5/2 [Fe(Cl2An)3] 3? anions whose high-spin character is confirmed by magnetic susceptibility measurements. The correlation between crystal structure and conducting behavior has been studied by means of tight-binding band structure calculations which support the observed conducting properties. 发自小木虫Android客户端 |
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