Molecular Conductors Based on M(dddt)2 Bisdithiolene Cation Complexes

Evolution of Spin-Crossover Transition in Hybrid Crystals Involving Cationic Iron Complexes [Fe(III)(3-OMesal2-trien)]+ and Anionic Gold Bis(dithiolene) Complexes Au(dmit)2 and Au(dddt)2

“…As a first step in this way, Faulmann et al have published a simple salt [Fe(sal2-trien)][Ni(dmit)2] showing a cooperative spin transition behavior with a wide hysteresis loop (30 K) [19]. These results convinced us that metal bis(dithiolene) anionic [M(dmit)2] and [M(dddt)2] complexes [12] might be promising candidates for enhancing cooperativity in SCO of cations based on mononuclear Fe(III) complexes with hexadentate Schiff base ligands. To achieve systems with molecular shape flexibility and rich in hydrogen bonding [20], we prepared the 3methoxy derivative (3-OMesal2-trien) 2− and used it as a ligand (Figure 1).…”

“…The hybrid structures implementing efficient exchange interaction between the SCO and conducting subsystems would facilitate the development of new molecular spintronic devices where the spin transport is controlled by spin-crossover complexes.Metal bis-1,2-dithiolene complexes, as organic donors and acceptors, possess a delocalized electron system as a planar central core M(C 2 S 2 ) 2 and present different formal oxidation states. This type of complex has been intensively studied as a component of molecular conductors [10][11][12]. In addition, metal dithiolene complexes have a rich variety of physical properties, such as Peierls instability of the low-dimensional systems and the quantum fluctuations [10,13].…”

Rare-Earth Elements in Molecular Conductors: Crystal and Electronic Structures

“…It should be noted that salts with the same anions but based on ET, (ET) 4 [Ln(NCS) 6 ] Á CH 2 Cl 2 , where Ln = Ho, Er, Yb and Y, have proved to be insulators (7). As our investigation has however shown, an introduction of a NO 3 group into the anion improved the conducting characteristics of the compounds.…”

“…The cavities along the a-and b-axis are uniformly occupied in an alternating way by ET and C 2 H 5 OH molecules, while the cavities along the ab diagonal are occupied by ET molecules only. Note that although the donor layers of the 1-3 salts remind those of the well-known k-phases, first found in the organic superconductors (ET) 4 (21), in the present case they contain both paired and single ET units (as well as the ethanol molecules).…”

“…However, it must not be fully ruled out that the discovered changes in the anion composition of the initial electrolyte may occur already at the stage of its preparation. To check the latter assumption, we have performed a single-crystal lowtemperature X-ray determination of the (Bu 4 N) 3 [Dy(NCS) 4 (Table 2). The referral of experimental peaks of electron density to the NO 3 group atoms was doubtful.…”