Radical anion salts and charge transfer complexes based on tetracyanoquinodimethane and other strong π-electron acceptors

Стародуб, В. А.; Starodub, T. N.

doi:10.1070/rc2014v083n05abeh004299

Cited by 46 publications

(14 citation statements)

References 386 publications

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“…A maximum in χT curve at helium temperatures is a characteristic feature of ferromagnetic or ferrimagnetic coupling in many molecular magneto-active systems, including HS Fe(III) complexes [52,54]. Ferromagnetic interactions were also found in numerous TCNQ based compounds with metallo-complex counerions [55]. Ferro-and ferrimagnetic coupling was reported for networks of transition metals, bridged by TCNQ −1 radicals M(TCNQ) 2 (M = Mn, Fe, Co, Ni), among which was the compound Mn(TCNQ) 2 with T c = 44 K [56,57].…”

Section: Conductivity and Magnetic Propertiesmentioning

confidence: 99%

The Highly Conducting Spin-Crossover Compound Combining Fe(III) Cation Complex with TCNQ in a Fractional Reduction State. Synthesis, Structure, Electric and Magnetic Properties

et al. 2017

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Three systems [Fe(III)(sal 2 -trien)](TCNQ) n ·X (n = 1, 2, X = MeOH, CH 3 CN, H 2 O) showing spin-crossover transition, conductivity and ferromagnetic coupling were synthesized and studied by X-ray diffraction, Montgomery method for resistivity, SQUID magnetometry and X-band EPR. Spin-spin interactions between local magnetic moments of Fe(III) ions and electron spins of organic TCNQ network were discovered and discussed within the framework of intermolecular superexchange coupling.

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Section: Conductivity and Magnetic Propertiesmentioning

confidence: 99%

The Highly Conducting Spin-Crossover Compound Combining Fe(III) Cation Complex with TCNQ in a Fractional Reduction State. Synthesis, Structure, Electric and Magnetic Properties

et al. 2017

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“…Since its first synthesis and the subsequent report of a high electrical conductivity in some of its salts, − 7,7,8,8-tetracyanoquinodimethane (TCNQ) (Figure a) has assumed a very important role in these research studies. TCNQ is one of the strongest organic electron-acceptor molecules, with a high electron affinity (between 2.88 and 3.38 eV), − and able to form a large number of charge transfer complexes with metallic or organic donors, some of which are superconductive at relatively high temperatures . It is also a component of many molecule-based organic magnets and participates in enzyme-based biosensors .…”

Section: Introductionmentioning

confidence: 99%

A Comparative Computational Study of the Adsorption of TCNQ and F4-TCNQ on the Coinage Metal Surfaces

2019

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The adsorption of tetracyanoquinodimethane and of the closely related derivative tetrafluorotetracyanoquinodimethane on the (111) surfaces of the coinage metals, namely, copper, silver, and (unreconstructed) gold, has been studied by dispersion-corrected ab initio density functional theory calculations. In order to separate the molecule–substrate interaction from the effects of molecule–molecule interaction, only the isolated molecules are considered. The results show that, in this case, the strength of the interaction of both molecules with the surfaces decreases in the expected order Cu > Ag > Au. The total amount of charge transfer, however, behaves in a different way, being larger for Ag and smaller for Cu and Au. This trend can be explained by a combination of the differences in the work functions of the three metals and the amount of backdonation between the molecule and the metal.

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“…To avoid such ambiguity simple ab initio calculations using the ORCA package on the [Ni(5,5ˈdmbpy)3] 2+ cation from 1 and the two crystallographically independent [Ni(4,4ˈ-dmbpy)3] 2+ cations from 3 using the atomic coordinates obtained from single crystal X-ray data were performed. ZFS parameters calculated using the effective Hamiltonian theory are summarized 20 in Table 5. Similar ZFS parameters were obtained for [Ni(bpy)3](BPh4)2 [55].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…TCNQ in combination with magnetically active transition metals sometimes displays spectacular magnetic behavior [15][16][17][18]. Moreover, materials based on TCNQ have generated high interest due to their electrical conductivity [19][20][21][22], or their gas, photo-and immunosensing properties [23][24][25]; their use in catalysis [26] or as cathode materials [27] has been reported, too.…”

Section: Introductionmentioning

confidence: 99%

Syntheses, crystal structures and magnetic properties of complexes based on [Ni(L-L) 3 ] 2+ complex cations with dimethylderivatives of 2,2′-bipyridine and TCNQ

Černák

Hegedüs

Váhovská

et al. 2018

Solid State Sciences

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From the aqueous-methanolic systems Ni(NO3)2 -LiTCNQ -5,5'-dmbpy and Ni(NO3)2 -LiTCNQ-4,4'-dmbpy three novel complexes [Ni(5,5'-dmbpy)3](TCNQ)2 (1), [Ni(4,4'dmbpy)3](TCNQ)2 (2) and [Ni(4,4'-dmbpy)3]2(TCNQ-TCNQ)(TCNQ)2•0.60H2O (3), were isolated in single crystal form. The new compounds were identified using chemical analyses and IR spectroscopy. Single crystal studies of all samples corroborated their compositions and have shown that their ionic structures contain the complex cations [Ni(5,5'-dmbpy)] 2+ (1) or [Ni(4,4'-dmbpy)] 2+ (2 and 3). The anionic parts of the respective crystal structures 1-3 are formed by TCNQ ⋅anion-radicals and in 3 also by a σ-dimerized dianion (TCNQ-TCNQ) 2with a C-C distance of 1.663(5) Å. The supramolecular structures are governed by weak hydrogen bonding interactions. The variable-temperature (2-300 K) magnetic studies of 1 and 3 confirmed the presence of magnetically active Ni(II) atoms with S = 1 and TCNQ ⋅anionradicals with S = 1/2 while the (TCNQ-TCNQ) 2dianion is magnetically silent. The magnetic behaviour was described by a complex magnetic model assuming strong antiferromagnetic interactions between some TCNQ ⋅anion-radicals.

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Radical anion salts and charge transfer complexes based on tetracyanoquinodimethane and other strong π-electron acceptors

Cited by 46 publications

References 386 publications

The Highly Conducting Spin-Crossover Compound Combining Fe(III) Cation Complex with TCNQ in a Fractional Reduction State. Synthesis, Structure, Electric and Magnetic Properties

The Highly Conducting Spin-Crossover Compound Combining Fe(III) Cation Complex with TCNQ in a Fractional Reduction State. Synthesis, Structure, Electric and Magnetic Properties

A Comparative Computational Study of the Adsorption of TCNQ and F4-TCNQ on the Coinage Metal Surfaces

Syntheses, crystal structures and magnetic properties of complexes based on [Ni(L-L) 3 ] 2+ complex cations with dimethylderivatives of 2,2′-bipyridine and TCNQ

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