Research output: Contribution to journal › Article › peer-review
On delicate balance between formation and decay of tetracyanoethylene molecular anion triggered by resonance electron attachment. / Пшеничнюк, С.А.; Асфандиаров, Наиль Лутфурахманович; Рахмеев, Рустам Габдулшагитович; Сафронов, Алексей. М.; Комолов, Алексей Сергеевич.
In: Journal of Chemical Physics, Vol. 158, No. 16, 164309, 28.04.2023.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - On delicate balance between formation and decay of tetracyanoethylene molecular anion triggered by resonance electron attachment
AU - Пшеничнюк, С.А.
AU - Асфандиаров, Наиль Лутфурахманович
AU - Рахмеев, Рустам Габдулшагитович
AU - Сафронов, Алексей. М.
AU - Комолов, Алексей Сергеевич
PY - 2023/4/28
Y1 - 2023/4/28
N2 - Low-energy (0-15 eV) resonance electron interaction with isolated tetracyanoethylene (TCNE) molecules is studied in vacuo by means of dissociative electron attachment (DEA) spectroscopy. Despite this molecule being relatively small, the long-lived molecular anions TCNE− are formed not only at thermal electron energy via a vibrational Feshbach resonance mechanism but also via shape resonances with the occupation of the π4* and π5* molecular orbitals by an incident electron. Dissociative decays of TCNE− are mostly observed at incident electron energy above the π7* temporary anion state predicted to lie at 1.69 eV by means of B3LYP/6-31G(d) calculations combined with the empirical scaling procedure. Electron attachment to the π6* orbital (predicted at 0.85 eV) leads to the generation of long-lived TCNE− species, which can decay via two competing processes: extra electron detachment, which appears in hundreds of microseconds, or elimination of two cyano groups to form the [TCNE − 2(CN)]− negative fragment on a tens of microsecond timescale. The latter is accompanied by the generation of a highly toxic cyanogen molecule as a neutral counterpart. Since the electron transfer to the acceptor molecule TCNE plays a key role in the formation of single-molecule magnets, the present data are of importance to understand the long-term behavior and likely harmful effects produced by cyanide-based prospective materials.
AB - Low-energy (0-15 eV) resonance electron interaction with isolated tetracyanoethylene (TCNE) molecules is studied in vacuo by means of dissociative electron attachment (DEA) spectroscopy. Despite this molecule being relatively small, the long-lived molecular anions TCNE− are formed not only at thermal electron energy via a vibrational Feshbach resonance mechanism but also via shape resonances with the occupation of the π4* and π5* molecular orbitals by an incident electron. Dissociative decays of TCNE− are mostly observed at incident electron energy above the π7* temporary anion state predicted to lie at 1.69 eV by means of B3LYP/6-31G(d) calculations combined with the empirical scaling procedure. Electron attachment to the π6* orbital (predicted at 0.85 eV) leads to the generation of long-lived TCNE− species, which can decay via two competing processes: extra electron detachment, which appears in hundreds of microseconds, or elimination of two cyano groups to form the [TCNE − 2(CN)]− negative fragment on a tens of microsecond timescale. The latter is accompanied by the generation of a highly toxic cyanogen molecule as a neutral counterpart. Since the electron transfer to the acceptor molecule TCNE plays a key role in the formation of single-molecule magnets, the present data are of importance to understand the long-term behavior and likely harmful effects produced by cyanide-based prospective materials.
UR - https://www.mendeley.com/catalogue/c1e680b3-89cc-3bd5-a7e3-bb7e720f3ce9/
U2 - 10.1063/5.0149262
DO - 10.1063/5.0149262
M3 - Article
VL - 158
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 16
M1 - 164309
ER -
ID: 104837687