TY  - JOUR
AB  - The gas-phase protonation of alpha,omega-diphenylalkanes ranging from diphenylmethane to 1,6-diphenylhexane and of 1-phenyl-2-(m-tolyl)ethane has been examined by FT-ICR mass spectrometry. Their gas-phase basicities (GB) at 300 K are consistently higher than that of toluene, as expected from their higher polarizability, and depend on the length of the methylene chain joining the two phenyl groups. This noticeable structure dependence is ascribed to an intramolecular solvation effect exerted by the second phenyl ring on the protonated one, allowed by a proper conformation of the linking chain. This effect is confirmed by a ca. 2 kcal mol(-1) decrease in basicity when the protonated and the neutral phenyl rings are separated by the same number of C-C bonds in a rigid trans-cyclohexane-1,4-diyl unit versus a flexible chain.
DA  - 1995
DO  - 10.1021/j100010a027
KW  - Ions
KW  - Benzene
KW  - Hydrogen-bonds
KW  - Basicities
KW  - Affinities
LA  - eng
IS  - 10
M2  - 3150
PY  - 1995
SN  - 0022-3654
SP  - 3150-3155
T2  - Journal of Physical Chemistry
TI  - Gas-Phase Protonation of Diphenylalkanes
UR  - https://nbn-resolving.org/urn:nbn:de:0070-pub-17741776
Y2  - 2024-11-22T01:09:02
ER  -