Nearly Isotropic Two-dimensional Sheets in a Partially Oxidized Co(Pc)(CN)2 Salt (Pc = phthalocyaninato)

Asari, Takehiro; Ishikawa, Masaru; Naito, T.; Matsuda, Masaki; Tajima, Hiroyuki; Inabe, Tamotsu

doi:10.1246/cl.2005.936

Cited by 10 publications

(10 citation statements)

References 7 publications

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“…Indeed, the band width of the slipped π-π stacking system was estimated to be about 0.5 eV from the thermoelectric power measurements, which is much smaller compared with those of the typical face-to-face stacked systems, e.g., 0.88 eV for Ni(Pc)I [1]. series of conducting crystals with various dimensionality of the π-π interactions were obtained [8,9]. In this mini-review, we will focus on the TPP salts.…”

Section: Introductionmentioning

confidence: 95%

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Axially Ligated Phthalocyanine Conductors with Magnetic Moments

Inabe

Hanasaki

2017

Magnetochemistry

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This mini-review describes electrical conductivity, magnetic properties, and magnetotransport properties of one-dimensional partially oxidized salts composed of axially ligated phthalocyanines, TPP[M(Pc)(CN) 2 ] 2 (TPP = tetraphenylphosphonium, Pc = phthalocyaninato), with M of Fe (d 5 , S = 1/2) and Cr (d 3 , S = 3/2). These salts are isomorphous, and π-π interactions in the crystal, that becomes the origin of the charge carriers, are nearly the same. Both the Fe and Cr salts show carrier localization and charge disproportionation which is enhanced by the interaction between local magnetic moments and conduction π-electrons (π-d interaction). However, the magnetic properties are slightly different between them. M = Fe has been found to show unique anisotropic magnetic properties and antiferromagnetic short-range magnetic order between the d-spins. On the other hand, for M = Cr, its magnetic moment is isotropic. Temperature dependence of the magnetic susceptibility shows typical Curie-Weiss behavior with negative Weiss temperature, but the exchange interaction is complicated. Both M = Fe and M = Cr show large negative magnetoresistance, reflecting the difference in the anisotropy. The magnetoresistance ratio (MR) is larger in the Fe system than in the Cr system in the low magnetic field range, but MR in the Cr system exceeds that in the Fe system when the magnetic field becomes higher than 15 T. We discuss the mechanism of the giant negative magnetoresistance with reference to the d-d, π-d, and π-π interactions.

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Section: Introductionmentioning

confidence: 95%

“…If the cationic part was exchanged, a series of conducting crystals with various dimensionality of the π-π interactions were obtained [8,9]. In this mini-review, we will focus on the TPP salts.…”

Section: Introductionmentioning

confidence: 99%

Axially Ligated Phthalocyanine Conductors with Magnetic Moments

Inabe

Hanasaki

2017

Magnetochemistry

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“…The parent Co conductor has a nearly isotropic 2-D p-p stacking structure, and shows metallic behavior down to 5 K under pressure. 16 This is in contrast to other 1-D systems, which all show thermally activated transport at low temperatures due to charge disproportionation even under pressure. 17,18 In this paper, we describe the structures and properties of [ ] are minor products and can be easily separated from the platelets under a microscope.…”

Section: Introductionmentioning

confidence: 81%

Giant magnetoresistance response by the π–d interaction in an axially ligated phthalocyanine conductor with two-dimensional π–π stacking structure

et al. 2010

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“…Contrary to PXX-II, PXX-III has a 2-D sheet constructed with solely type-B overlaps, resulting in nearly isotropic electronic structure [13]. Two of the neighboring sheets interact by type-A overlaps, forming double sheet structure.…”

Section: Partially Oxidized Salt Crystalsmentioning

confidence: 99%