title: Complete series of chiral paramagnetic molecular conductors based on tetramethyl-bis(ethylenedithio)-tetrathiafulvalene (TM-BEDT-TTF) and Chloranilate-bridged heterobimetallic honeycomb layers.
abstract: Electrocrystallization of enantiopure (S,S,S,S)- and (R,R,R,R)-tetramethyl-bis(ethylenedithio)-tetrathiafulvalene (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[K(I)Fe(III)(Cl2An)3]·3H2O (1), β-[(R,R,R,R)-TM-BEDT-TTF]3PPh4[K(I)Fe(III)(Cl2An)3]·3H2O (2), and β-[(rac)-TM-BEDT-TTF]3PPh4[K(I)Fe(III)(Cl2An)3]·3H2O (3). Compounds 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.
authors: †Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 - Bivio per Sestu - I09042 Monserrato (Cagliari), Italy.|‡Laboratoire MOLTECH-Anjou UMR 6200, UFR Sciences, CNRS, Université d'Angers, Bât. K, 2 Bd. Lavoisier, 49045 Angers, France.
authors: Matteo
authors: M
authors: Atzori
authors: ‡Laboratoire MOLTECH-Anjou UMR 6200, UFR Sciences, CNRS, Université d'Angers, Bât. K, 2 Bd. Lavoisier, 49045 Angers, France.
authors: Flavia
authors: F
authors: Pop
authors: ∥Laboratoire de Physique des Solides, UMR 8502, Bât. 510, CNRS-Université Paris-Sud, 91405 Orsay, France.
authors: Pascale
authors: P
authors: Auban-Senzier
authors: #CNRS, CRPP, UPR 8641, F-33600 Pessac, France.|§Univ. Bordeaux, CRPP, UPR 8641, F-33600 Pessac, France.
authors: Rodolphe
authors: R
authors: Clérac
authors: ◊Institut de Ciència de Materials de Barcelona (CSIC), Campus de la UAB, E-08193 Bellaterra, Spain.
authors: Enric
authors: E
authors: Canadell
authors: †Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, S.S. 554 - Bivio per Sestu - I09042 Monserrato (Cagliari), Italy.
authors: Maria Laura
authors: ML
authors: Mercuri
authors: ‡Laboratoire MOLTECH-Anjou UMR 6200, UFR Sciences, CNRS, Université d'Angers, Bât. K, 2 Bd. Lavoisier, 49045 Angers, France.
authors: Narcis
authors: N
authors: Avarvari