| | 1 | Author
| HeinzP. Fritz, Helmut Gebauer, Peter Friedrich, Peter Ecker, Reinhold Artes, Ulrich Schubert | Requires cookie* | | | Title
| Elektrochemische Synthesen, XIV [1] Radikalkation-Salze des Naphthalins Electrochemical Syntheses, XIV [1]. Radical Cation Salts of Naphthalene  | | | | Abstract
| By anodic oxidation of naphthalene in H2CCI2/O.O2 m Bu4NPF6 at —45 °C dark red-violet crystals of (CioHshPFö can be obtained by electrocrystallisation. They are stable at low temperatures, however, decompose on warming. In solution and in the poly-crystalline 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 (CioHs^PFe 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 CioHg 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 PFß -ions have four nearest CioHs 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. (CIOH8)2AsF6 is isomorphous. | | | |
Reference
| Z. Naturforsch. 33b, 498—506 (1978); eingegangen am 21. Februar 1978 | | | |
Published
| 1978 | | | |
Keywords
| Naphthalene Radical Cation, X-ray, Columnar Structure, Conductivity | | | |
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| default:Reihe_B/33/ZNB-1978-33b-0498.pdf | | | | Identifier
| ZNB-1978-33b-0498 | | | | Volume
| 33 | |
| 2 | Author
| Stephan Friederichs, Jens Kudnig, Günter Klar | Requires cookie* | | | Title
| Elementorganische Verbindungen mit o-Phenylenresten, XXVIII [1] Charge-transfer | | | | Abstract
| Komplexe von 2,3,7,8-Tetraalkoxy-chalkogenanthrenen mit 7,7,8,8-Tetracyan-2,3?5,6-tetrafluor-chinodimethan Organometalloidal Compounds with o-Phenylene Substituents, Part XXVIII [1] Charge-Transfer Complexes of 2,3,7,8-Tetraalkoxy-chalcogenanthrenes wjth 7.7.8.8-Tetracyano-2,3,5,6-tetrafluoro-quinodimethane -selenanthrene, as well as -tetraethoxythianthrene gi ve isostructural 1:1 charge-transfer complexes with 7,7,8,8-tetracyano-2,3,5,6-tetrafluoro-quinodimethane. In the columnar crystal structures there are alternating donor and acceptor molecules. The chalcogenanthrene molecules which are folded at their E -E axes in the pure state, are planar in the complexes indicating a charge-transfer according to [donor]+ [acceptor]-. Consecutive molecules of the stacks are arranged in such a way that an optimum overlap of the HOMO of the donor and the LUMO of the acceptor, both of which are of 7T-type character according to MNDO calculations, is secured. | | | |
Reference
| Z. Naturforsch. 51b, 1295—1300 (1996); eingegangen am 1. April | | | |
Published
| 1996 | | | |
Keywords
| Tetracyano-2, 3, 5, 6-tetrafiuoro-quinodi-methane, 1:1 Charge-Transfer Complexes, Columnar Structures, MNDO Calculations 2, 3, 7, 8-Tetramethoxythianthrene and | | | |
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| default:Reihe_B/51/ZNB-1996-51b-1295.pdf | | | | Identifier
| ZNB-1996-51b-1295 | | | | Volume
| 51 | |
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