Long-Lived Radical Cation Salts Obtained by Interaction of Monocyclic Arenes with Niobium and Tantalum Pentahalides at Room Temperature: EPR and DFT Studies

2013 ◽  
Vol 19 (41) ◽  
pp. 13962-13969 ◽  
Author(s):  
Fabio Marchetti ◽  
Guido Pampaloni ◽  
Calogero Pinzino
Keyword(s):  
Radical Cation ◽  
Room Temperature ◽  
Dft Studies ◽  
Radical Cation Salts

Elektrochemische Synthesen, XIV [1] Radikalkation-Salze des Naphthalins / Electrochemical Syntheses, XIV [1]. Radical Cation Salts of Naphthalene

1978 ◽  
Vol 33 (5) ◽  
pp. 498-506 ◽  
Author(s):  
Heinz P. Fritz ◽  
Helmut Gebauer ◽  
Peter Friedrich ◽  
Peter Ecker ◽  
Reinhold Artes ◽  
...  
Keyword(s):  
Radical Cation ◽  
Low Temperatures ◽  
Room Temperature ◽  
Specific Conductivity ◽  
Columnar Structure ◽  
Screw Axis ◽  
Radical Cation Salts ◽  
Difference Fourier ◽  
Pure Hydrocarbon

Abstract By anodic oxidation of naphthalene in H2CCl2/O.O2m Bu4NPF6 at -45 °C dark red-violet crystals of (C10H8)2PF6 can be obtained by electrocrystallisation. They are stable at low temperatures, however, decompose on warming. In solution and in the polycrystalline state these radical cation salts show only narrow e.p.r. signals without h.f.s. The specific conductivity of a polycrystalline pellet at room temperature was determined to be 0.12 ±0.046 Ohm-1 cm-1 . The structure determination of (C10H8)2PF6 yielded the tetragonal space group P42/n, Z = 2, a = b = 1156(2), c = 640(1) pm. Patterson synthesis and difference Fourier analyses showed the compound to have a columnar stacking of C10H8 units the long molecular axes of which are twisted alternately by 90° around a screw axis in c-direction, and the molecular planes of which are 320 pm apart. The PF6-ions have four nearest C10H8 neighbours lying in pairs in parallel planes 63 pm above and below that plane of PF6- perpendicular to the c-axis and containing a PF4 group. This is the first established case for a columnar structure of a pure hydrocarbon radical cation. (C10H8)2AsF6 is isomorphous.

scholarly journals New Radical Cation Salts Based on BDH-TTP Donor: Two Stable Molecular Metals with a Magnetic [ReF6]2− Anion and a Semiconductor with a [ReO4]− Anion

2021 ◽  
Vol 7 (4) ◽  
pp. 54
Author(s):  
Nataliya D. Kushch ◽  
Gennady V. Shilov ◽  
Lev I. Buravov ◽  
Eduard B. Yagubskii ◽  
Vladimir N. Zverev ◽  
...  
Keyword(s):  
Radical Cation ◽  
Low Temperatures ◽  
Ac Susceptibility ◽  
Slow Relaxation ◽  
Organic Radical ◽  
Inorganic Anion ◽  
Distinctive Features ◽  
Metallic Character ◽  
Radical Cation Salts ◽  
Partial Population

Three radical cation salts of BDH-TTP with the paramagnetic [ReF6]2− and diamagnetic [ReO4]− anions have been synthesized: κ-(BDH-TTP)4ReF6 (1), κ-(BDH-TTP)4ReF6·4.8H2O (2) and pseudo-κ″-(BDH-TTP)3(ReO4)2 (3). The crystal and band structures, as well as the conducting properties of the salts, have been studied. The structures of the three salts are layered and characterized by alternating κ-(1, 2) and κ″-(3) type organic radical cation layers with inorganic anion sheets. Similar to other κ-salts, the conducting layers in the crystals of 1 and 2 are formed by BDH-TTP dimers. The partial population of positions of Re atoms and disorder in the anionic layers of 1–3 are their distinctive features. Compounds 1 and 2 show the metallic character of conductivity down to low temperatures, while 3 is a semiconductor. The ac susceptibility of crystals 1 was investigated in order to test the possible slow relaxation of magnetization associated with the [ReF6]2− anion.

ChemInform Abstract: Tetrathiafulvalene-Based Radical Cation Salts with Transition Metal Bis(dicarbollide) Anions

ChemInform ◽  
2016 ◽  
Vol 47 (11) ◽  
pp. no-no
Author(s):  
Vladimir I. Bregadze ◽  
Oleg A. Dyachenko ◽  
Olga N. Kazheva ◽  
Andrey V. Kravchenko ◽  
Igor B. Sivaev ◽  
...  
Keyword(s):  
Transition Metal ◽  
Radical Cation ◽  
Radical Cation Salts

Molecular metals based on radical cation salts of ET and some its analogues with the photochromic nitroprusside anion, [Fe(CN)5NO]2−

1999 ◽  
Vol 102 (1-3) ◽  
pp. 1646-1649 ◽  
Author(s):  
L. Kushch ◽  
L. Buravov ◽  
V. Tkacheva ◽  
E. Yagubskii ◽  
L. Zorina ◽  
...  
Keyword(s):  
Radical Cation ◽  
Radical Cation Salts ◽  
Nitroprusside Anion
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