Dissociation energetics of the phenol(+)⋯Ar(2) cluster ion: The role of π→H isomerization.
The dissociation energetics in the phenol(+)⋯Ar(2)(2π) cluster ion have been investigated using photoionization efficiency and mass analyzed threshold ionization spectroscopy. The appearance energies for the loss of one and two Ar atoms are determined as ∼210 and ∼1115 cm(-1), respectively. The difference between the appearance energy for the first Ar ligand in phenol(+)⋯Ar(2)(2π) and the dissociation energy of the phenol(+)⋯Ar(π) dimer (535cm(-1)) is explained by the isomerization of one π-bound Ar ligand to the OH binding site (H-bond) upon ionization. The energy difference between phenol(+)⋯Ar(2)(2π) and phenol(+)⋯Ar(2)(H/π) could also be estimated to be around 325cm(-1), which corresponds roughly to the difference of the binding energy of a π-bound and H-bound Ar ligands. The binding energy of the H-bound Ar atom in phenol(+)⋯Ar(2)(H/π) is derived to be ∼905cm(-1).
The Photon Science Institute, The University of Manchester, Manchester M13 9PL, United Kingdom.
Xin
X
Tong
Antonio
A
Armentano
Mikko
M
Riese
Med
M
Benyezzar
Simon M
SM
Pimblott
Klaus
K
Müller-Dethlefs
Shun-Ichi
S
Ishiuchi
Makoto
M
Sakai
Akihiro
A
Takeda
Masaaki
M
Fujii
Otto
O
Dopfer
D001128:Argon / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D019800:Phenol / Q000737:chemistry*; D010777:Photochemistry; D013057:Spectrum Analysis; D013816:Thermodynamics
D007477:Ions; D019800:Phenol; D001128:Argon