33S and 13C hyperfine interactions in the single-crystal EPR spectra of 63Cu(II) bis(diethyl-dithiocarbamate)

Kirmse, R.; Solovev, B. V.

doi:10.1016/0022-1902(77)80429-6

Cited by 30 publications

(2 citation statements)

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“…and [Ni(mnt) 2 ] À units (g DT 2.0077, [13] g Nimnt 2 2.0377, [40] g Ptmnt 2 2.0420 [41] ) whereas, surprisingly, the g value of the Pt salt (1.96) is much lower than those of the [DT-TTF]…”

Section: Magnetic Properties: Since the [Au(mnt) 2 ]mentioning

confidence: 94%

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The [(DT-TTF)2M(mnt)2] Family of Radical Ion Salts: From a Spin Ladder to Delocalised Conduction Electrons That Interact with Localised Magnetic Moments

Ribera¹,

Rovira²,

Veciana³

et al. 1999

Chem. Eur. J.

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Electrocrystallisation of the p-electron donor dithiopheno-tetrathiafulvalene (DT-TTF) with maleonitrile dithiolate (mnt) ± metal (M) complexes gives rise to the new family of radical ion salts [(DT-TTF) 2 M(mnt) 2 ] (M Au, Pt, Ni), which are isostructural and crystallise in the monoclinic space group P2 1 /n forming regular segregated stacks of donor and acceptor molecules along the b axis. The DT-TTF stacks are paired and interact strongly through S´´´S contacts in a ladder-like motif. The three salts have quite high room-temperature electrical conductivities (9, 40 and 40 S cm À1 for M Au, Pt and Ni respectively) but their conductivity ± temperature dependencies differ. The Au salt has an activated conductivity at room temperature whereas the Ni and Pt salts are metal-like at room temperature and both exhibit a metal ± insulator transition around 120 K. These contrasting transport properties are accounted for by the differences in the transfer integrals along the DT-TTF stacks. The magnetic susceptibility of the salt with M Au, in which the [Au(mnt) 2 À ] anion is diamagnetic, can be fitted to a twolegged spin-ladder model. From diffuse X-ray scattering studies it is established that below 220 K the donors dimerise along the b stacking direction, and the spin carrier units in the ladder are identified as those formed by dimerised donors [(DT-TTF) 2 ]. . Observation in their EPR spectra of a single line which increases dramatically in width as the conductivity increases is evidence for the presence of two magnetic subsystems which interact in the salts (M Ni, Pt) with paramagnetic [M(mnt) 2 ] À ions.

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Section: Magnetic Properties: Since the [Au(mnt) 2 ]mentioning

confidence: 94%

“…At room temperature the average g factor of the Ni salt (2.0163) is between those of the [DT-TTF] . and [Ni(mnt) 2 ] À units (g DT 2.0077, [13] g Nimnt 2 2.0377, [40] g Ptmnt 2 2.0420 [41] ) whereas, surprisingly, the g value of the Pt salt (1.96) is much lower than those of the [DT-TTF] . and [Pt(mnt) 2 ] À .…”

Section: Magnetic Propertiesmentioning

confidence: 99%