TY - JOUR
T1 - Spin-spin coupling between the two unpaired electrons in cross-conjugated tetrathiafulvalene dication radicals
AU - Yamauchi, Jun
AU - Aoyama, Takuo
AU - Kanemoto, Katsuichi
AU - Sasaki, Shigeru
AU - Iyoda, Masahiko
PY - 2000/4
Y1 - 2000/4
N2 - Spin-spin interactions were examined for bis(tetrathiafulvalenyl) (TTF) derivatives bridged with a 1,1-vinyl group (2,2-diphenyl, 1: 2,2-fluorenylidene, 2; and 2,2-dimethyl, 3). The chemical oxidation of these cross-conjugated TTFs using AgClO4 yielded characteristic seven-line ESR spectra, indicating the exchange interactions between the unpaired electrons on each TTF moiety. Compounds 2 and 3, in addition, exhibited fine structures and half-field resonances in the frozen solutions, which evidence the triplet interaction in the solid state, even with a twisted geometry of the molecular configuration. These findings substantiate the possibility of spin-spin interactions or triplet ground states predicted for some TTF oligomers.
AB - Spin-spin interactions were examined for bis(tetrathiafulvalenyl) (TTF) derivatives bridged with a 1,1-vinyl group (2,2-diphenyl, 1: 2,2-fluorenylidene, 2; and 2,2-dimethyl, 3). The chemical oxidation of these cross-conjugated TTFs using AgClO4 yielded characteristic seven-line ESR spectra, indicating the exchange interactions between the unpaired electrons on each TTF moiety. Compounds 2 and 3, in addition, exhibited fine structures and half-field resonances in the frozen solutions, which evidence the triplet interaction in the solid state, even with a twisted geometry of the molecular configuration. These findings substantiate the possibility of spin-spin interactions or triplet ground states predicted for some TTF oligomers.
KW - Cation radical
KW - Cyclic voltammetry
KW - Dimeric TTF
KW - ESR
KW - Spin-spin interaction
KW - X-ray structure analysis
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U2 - 10.1002/(SICI)1099-1395(200004)13:4<197::AID-POC229>3.0.CO;2-2
DO - 10.1002/(SICI)1099-1395(200004)13:4<197::AID-POC229>3.0.CO;2-2
M3 - Article
AN - SCOPUS:0001440690
VL - 13
SP - 197
EP - 202
JO - Journal of Physical Organic Chemistry
JF - Journal of Physical Organic Chemistry
SN - 0894-3230
IS - 4
ER -