Premium
Dimeric Radical Cation of 4,5,7,8‐Tetramethyl[2.2]paracyclophane
Author(s) -
Bruhin Jürg,
Gerson Fabian,
OhyaNishiguchi Hiroaki
Publication year - 1977
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19770600733
Subject(s) - chemistry , hyperfine coupling , paramagnetism , radical ion , symmetry (geometry) , crystallography , coupling constant , benzene , hyperfine structure , radical , ion , organic chemistry , atomic physics , condensed matter physics , physics , geometry , mathematics , particle physics
Electrolytic oxidation of 4,5,7,8‐tetramethyl[2.2]paracyclophane (I) yields a paramagnetic species which by ESR. spectroscopic evidence must be ascribed to the dimeric radical cation I 2 · ⊕. Analogous dimers are obtained from the 12, 13, 15, 16‐tetradeuterio‐ and 1, 1, 10, 10, 12, 13, 15, 16‐octadeuterio‐derivatives of I so that all coupling constants can be unequivocally assigned to sets of equivalent protons. The hyperfine data for I 2 · ⊕ are consistent with an effective D 2 h or D 2 d symmetry, the four benzene rings lying in parallel planes.
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom