The (DT-TTF)-M(mnt)2 Family of Compounds

Ribera, E.; Rovira, Concepció; Veciana, Jaume; Tarrés, Judit; Canadell, Enric; Rousseau, Roger; Molins, Elı́es; Mas, M.; Schoeffel, J. P.; Pouget, Jean‐Paul; Morgado, Jorge; Gama, V.; Henriques, R.T.; Almeida, Manuel

doi:10.1016/s0379-6779(98)00286-0

Cited by 27 publications

(42 citation statements)

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“…α-mDT-TTF (1) was synthesized by self-coupling of the corresponding 5-methylthieno[2, 3-d] [1,3]dithiole-2-thione in trimethyl phosphite by following a previously described procedure. [9] This compound is soluble in common organic solvents, and orange plate-shaped crystals suitable for Xray measurements were obtained by recrystallization from acetone/2-propanol (3:1) solutions.…”

Section: Resultsmentioning

confidence: 99%

“…Table 2. Crystal and refinement data for (α-mDT-TTF) (1), (α-mDT-TTF)[Co(mnt) 2 ] (2), and (α-mDT-TTF) 3 Figure S1, Supporting Information) with welldefined pairs of waves indicative of quasireversible redox processes, contrasts with those of DT-TTF, α-DT-TTF, and BET-TTF (see Scheme 1 for structure), in which other association processes are visible and adsorbed species are formed on the electrode. [10] This is certainly a consequence of the higher solubility of the methyl-substituted molecule.…”

Section: Resultsmentioning

confidence: 99%

“…(α-mDT-TTF) 3 [Au(mnt) 2 ] 2 (3) crystallizes in the monoclinic system, space group P2 1 /c. The unit cell is composed of two α-mDT-TTF donor molecules, one at an inversion center and one [Au(mnt) 2 ]…”

Section: Resultsmentioning

confidence: 99%

“…[ -anions (mnt = maleonitriledithiolate), M = Co and Au, were obtained by electrocrystallization; they present unusual stoichiometries: (α-mDT-TTF)[Co(mnt) 2 ] and (α-mDT-TTF) 3 [Au(mnt) 2 ] 2 . In the cobalt compound, the donor molecules are fully oxidized and the Co complex is dimerized; it presents semiconducting behavior (7 ϫ 10 -3 S cm -1 ).…”

Section: Introductionmentioning

confidence: 99%

“…[3] The analogous compounds with an ethylenethiothiophene-tetrathiafulvalene (ETT-TTF) donor have the same type of ladder structure of the donors, but owing to disorder in the position of the thiophene sulfur atoms they do not present spin-ladder behavior. [4] In spite of a similar orientation disorder, a spin-ladder magnetic system was found in α-DT-TTF salts, which behave as weakly disordered spin-ladder systems.…”

Section: Introductionmentioning

confidence: 99%

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A Methyl‐Substituted Thiophene–Tetrathiafulvalene Donor and Its Salts

et al. 2015

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α‐Methyldithiophene–tetrathiafulvalene (α‐mDT‐TTF), the first alkyl‐substituted thiophene–tetrathiafulvalene electronic donor, and some of its charge‐transfer salts were explored. The crystal structure of α‐mDT‐TTF is composed of molecular stacks aligned parallel to each other. Its cyclic voltammetry shows higher electron‐donor ability than the unsubstituted analogue. This material was employed as a semiconductor in an organic field‐effect transistor and showed a mobility of 4 × 10–4 cm2 V–1 s–1. Two charge‐transfer salts of this donor with [M(mnt)2]– anions (mnt = maleonitriledithiolate), M = Co and Au, were obtained by electrocrystallization; they present unusual stoichiometries: (α‐mDT‐TTF)[Co(mnt)2] and (α‐mDT‐TTF)3[Au(mnt)2]2. In the cobalt compound, the donor molecules are fully oxidized and the Co complex is dimerized; it presents semiconducting behavior (7 × 10–3 S cm–1). The gold compound is composed of alternating stacks of donor trimers and pairs of anions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Methyl‐Substituted Thiophene–Tetrathiafulvalene Donor and Its Salts

et al. 2015

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Synthesis, Structure and Physical Properties of Tetrabutylammonium Salts of Nickel Complexes with the New Ligand dcbdt = 4,5-dicyanobenzene-1,2-dithiolate, [Ni(dcbdt)2]z− (z = 0.4, 1, 2)

Simão¹,

Alves²,

Belo³

et al. 2001

Eur. J. Inorg. Chem.

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The synthesis and characterization of the new aromatic ortho-dithiol, 4,5-dicyanobenzene-1,2-dithiol (3) is reported. This compound was used to prepare tetrabutylammonium salts of novel nickel complexes; the nickel(II) salt (nBu 4 N) 2 -[Ni(dcbdt) 2 ] (4), the nickel(III) salt (nBu 4 N) 2 [Ni(dcbdt) 2 ] 2 (5), and the partially oxidized Ni III/IV salt (nBu 4 N) 2 [Ni(dcbdt) 2 ] 5 (6). (dcbdt = 4,5-dicyanobenzene-1,2-dithiolate). The Ni II complex presents a square-planar coordination geometry and is diamagnetic, while in the paramagnetic Ni III complex

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Organic Spin Ladders from Tetrathiafulvalene (TTF) Derivatives

et al. 2005

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Starting from the first organic spin ladder reported, a dithiophene‐tetrathiafulvalene salt ((DT‐TTF)2[Au(mnt)2]) (mnt = maleonitriledithiolate), two different approaches to enlarge the family of organic spin‐ladder systems are described. The first approach consists of a molecular variation of the donor; to that purpose, the new TTF derivative ethylenethiothiophene‐tetrathiafulvalene (ETT‐TTF, 3), is synthesized and structurally characterized. From this donor a new ladder‐like structure compound, (ETT‐TTF)2[Au(mnt)2] (4), isostructural with (DT‐TTF)2[Au(mnt)2], is obtained. However, the magnetic properties of 4 do not follow the known spin‐ladder behavior owing to orientational disorder exhibited by the ETT‐TTF molecules in the crystal structure. In the second approach, the acceptor complex is changed, either in the nature of the ligand or in the metal. With the [Au(i‐mnt)2]– salt (i‐mnt = iso‐maleonitriledithiolate), the new ladder‐like compound (DT‐TTF)2[Au(i‐mnt)2] (5), isostructural with 4, is obtained, but only as a minority product. Two other compounds with a different anion generated in situ, bearing a Au(I) dimeric core, were also isolated; (DT‐TTF)9[Au2(i‐mnt)2]2 (6) as the most abundant phase and (DT‐TTF)2[Au2(i‐mnt)2] (7) as another minority phase. Salt 7 is characterized by X‐ray crystallography as a chiral compound, due to the torsion of the ligands around the central Au–Au bond. The magnetic properties of (DT‐TTF)2[Au(i‐mnt)2] (5) indicate that it follows a spin‐ladder behavior and the electron paramagnetic resonance (EPR) data is fitted to the Troyer and Barnes and Riera equations with the parameters Δ/kB = 71 K, J∥/kB = 86 K, and J⟂/kB = 142 K, indicating a J⟂/J∥ ratio of 1.65. The change of the gold complex [Au(mnt)2] for its copper analogue, [Cu(mnt)2] also leads to a ladder‐like structure, (DT‐TTF)2[Cu(mnt)2] (8), which is isostructural with the gold analogue and with salts 4 and 5. The fully ionic salt (DT‐TTF)[Cu(mnt)2] (9) is also obtained. The magnetic properties demonstrated that compound 8 is the third organic spin‐ladder system of this family, and the values found by a fitting to the ladder equations were Δ/kB = 123 K, J∥/kB = 121 K, and J⟂/kB = 218 K, corresponding to a J⟂/J∥ ratio of 1.75, similar to that of 5 and close to that of an ideal spin ladder.

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The (DT-TTF)-M(mnt)2 Family of Compounds

Cited by 27 publications

References 2 publications

A Methyl‐Substituted Thiophene–Tetrathiafulvalene Donor and Its Salts

A Methyl‐Substituted Thiophene–Tetrathiafulvalene Donor and Its Salts

Synthesis, Structure and Physical Properties of Tetrabutylammonium Salts of Nickel Complexes with the New Ligand dcbdt = 4,5-dicyanobenzene-1,2-dithiolate, [Ni(dcbdt)2]z− (z = 0.4, 1, 2)

Organic Spin Ladders from Tetrathiafulvalene (TTF) Derivatives

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The (DT-TTF)-M(mnt)2 Family of Compounds

Cited by 27 publications

References 2 publications

A Methyl‐Substituted Thiophene–Tetra­thiafulvalene Donor and Its Salts

A Methyl‐Substituted Thiophene–Tetra­thiafulvalene Donor and Its Salts

Synthesis, Structure and Physical Properties of Tetrabutylammonium Salts of Nickel Complexes with the New Ligand dcbdt = 4,5-dicyanobenzene-1,2-dithiolate, [Ni(dcbdt)2]z− (z = 0.4, 1, 2)

Organic Spin Ladders from Tetrathiafulvalene (TTF) Derivatives

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A Methyl‐Substituted Thiophene–Tetrathiafulvalene Donor and Its Salts

A Methyl‐Substituted Thiophene–Tetrathiafulvalene Donor and Its Salts