Perylene-Dithiolate Complexes The Platinum Salt

Alcácer, Luís; Novais, H. M.; Pedroso, Frederico Ferreira Fonseca

doi:10.1007/978-1-4684-3480-4_41

Cited by 4 publications

(1 citation statement)

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“…The parameters are k B T SP 0 ~ Θ ~ J/k B ~ ∆k B ~ 20 K. From a Curie-Weiss law fit to χ(T), the effective number of Bohr magnetons p = g[J(J + 1)] 1/2 is about 1.87 [17], (close to the value p = 1.73 for g = 2, and J = ½). Since a dimerization driven solely by a one-chain spin-lattice effect has the criterion k B T SP 0 << J, the fact that T c ~ 8 K (i.e., is so high) is anomalous, and the origin of the SP state is not clear.…”

Section: Introductionmentioning

confidence: 99%

1H and 195Pt NMR Study of the Parallel Two-Chain Compound Per2[Pt(mnt)2]

et al. 2012

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Abstract:1 H and 195 Pt NMR are used to probe the spin ½ anion chain in the quasi-one-dimensional conductor Per 2 [Pt(mnt) 2 ], which exhibits nearly simultaneous charge density wave (CDW) and spin-Peierls (SP) transitions at low temperatures (T c ~ 8 K). Below T c the [Pt(mnt) 2 ] chain forms a spin-singlet state that is evident in 1 H NMR spectra and spin relaxation (1/T 1 ) rates; however minority unpaired Pt spins may remain in the SP ground state. With increasing magnetic field, the SP and CDW order parameters decrease in unison, indicating they are coupled up to a critical field B c ~ 20 T. Above B c , the spin singlet evolves into a spin-polarized configuration. The 195 Pt NMR signals vanish as either T c or B c are approached from within the SP ground state, suggesting the hyperfine field of the Pt nucleus is significantly stronger than at the proton sites. Simulations yield a consistent picture of the angular, temperature, and magnetic field-dependent spectral features. OPEN ACCESS OPEN ACCESSCrystals 2012, 2

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Section: Introductionmentioning

confidence: 99%