Electrical Bistability around Room Temperature in an Unprecedented One-Dimensional Coordination Magnetic Polymer

Copper dithiolene [Cu(SC6H2Cl2S)2]− units connected to alkaline/copper complexes: from ionic assemblies to discrete molecular entities and coordination polymers

New coordination polymers or ion-pair complexes containing the [Cu(SC₆H₂Cl₂S)₂]⁻ entity and M⁺ (alkaline or Cu metals) has been obtained.

Synthesis and structural characterization of transition metal dithiolene derivatives containing divalent metals as counter-cations

Complexes containing [Fe₂(SC₆H₂Cl₂S)₄]²⁻ or [Ni(SC₆H₂Cl₂S)₂]⁻ entities and divalent metal cations as well as an 1D-coordination polymer K/Zn have been obtained and their magnetic behaviour studied.

Di-μ-dimethylformamide-κ4O:O-μ-tetrahydrofuran-κ2O:O-bis[(tetrahydrofuran-κO)sodium(I)] bis(μ-3,6-dichlorobenzene-1,2-dithiolato-κ3S,S′:S)bis[(3,6-dichlorobenzene-1,2-dithiolato-κ2S,S′)iron(III)]

The title compound, [Na2(C3H7NO)2(C4H8O)5][Fe2(C6H2Cl2S2)4], was synthesized and its crystal structure was solved. The ionic crystal contains a [Fe2(S2C6H2Cl2)4]2−dimeric anion and a [Na2(THF)4(μ-THF)(μ-DMF)2]2+cation, where THF is tetrahydrofuran and DMF is dimethylformamide, comprising two sodium atoms joined by one THF and two DMF molecules bridging through their O atoms. The five-coordinate environment of each Na site is completed by two terminal THF molecules. The asymmetric unit contains half a cationic unit (as the cation is placed on a twofold axis) and half an anion, as there is an inversion centre at the midpoint of the Fe—Fe vectors. The cationic and anionic moieties are linked by C—H...Cl and C—H...S interactions.

Coordination polymers based on diiron tetrakis(dithiolato) bridged by alkali metals, electrical bistability around room temperature, and strong antiferromagnetic coupling

Coordination polymer chains have been formed by the direct reaction between HSC6H2Cl2SH and FeCl3·6H2O in the presence of an aqueous solution of the corresponding alkali-metal hydroxide (M = Li, Na, and K) or carbonate (M = Rb and Cs). The structures consist of dimeric [Fe2(SC6H2Cl2S)4](2-) entities bridged by [M2(THF)4] [M = K (1), Rb (2), and Cs (3); THF = tetrahydrofuran] or {[Na2(μ-H2O)2(THF)2] (5 and 5') units. The smaller size of the lithium atom yields an anion/cation ion-pair molecule, [Li(THF)4]2[Fe2(SC6H2Cl2S)4] (4), in which the dianionic moieties are held together by Cl···Cl interactions. Electrical characterization of these compounds shows a general semiconductor behavior in which the conductivity and activation energies are mainly determined by the M-Cl and M-S bond distances. Compounds 1 and 5' are interesting examples of bistability showing reversible transitions centered at ca. 350 and 290 K with very large hysteresis of ca. 60 and 35 K, respectively. All of these compounds exhibit intradimer strong antiferromagnetic Fe···Fe interactions.

Light induced modulation of charge transport phenomena across the bistability region in [Fe(Htrz)2(trz)](BF4) spin crossover micro-rods

In this paper we report a photo-activated phenomena in [Fe(Htrz)₂(trz)](BF₄) spin crossover material based electrical device upon and after light irradiation.

New insights into the chemistry of di- and trimetallic iron dithiolene derivatives. Structural, Mössbauer, magnetic, electrochemical and theoretical studies

Reaction of Fe3(CO)12 with 1,2-dithiolene HSC6H2Cl2SH affords a mixture of complexes [Fe2(CO)6(μ-SC6H2Cl2S)] 1, [Fe2(SC6H2Cl2S)4] 2 and [Fe3(CO)7(μ3-SC6H2Cl2S)2] 3. In the course of the reaction the trimetallic cluster 3 is first formed and then converted into the known dinuclear compound 1 to afford finally the neutral diiron tetrakis(dithiolato) derivative 2. Compounds 2 and 3 have been studied by Mössbauer spectroscopy, X-ray crystallography and theoretical calculations. In compound 2 the metal atoms are in an intermediate-spin Fe(III) state (S(Fe) = 3/2) and each metal is bonded to a bridging dithiolene ligand and a non-bridging thienyl radical (S = 1/2). Magnetic measurements show a strong antiferromagnetic coupling in complex 2. Cyclic voltammetry experiments show that the mixed valence trinuclear cluster 3 undergoes a fully reversible one electron reduction. Additionally, compound 3 behaves as an electrocatalyst in the reduction process of protons to hydrogen.