Femtosecond real-time alignment in chemical reactions
作者:M. Dantus、R.M. Bowman、J.S. Baskin、A.H. Zewail
DOI:10.1016/0009-2614(89)87508-6
日期:1989.7
Femtosecond real-time alignment in dissociationreactions is observed experimentally for HgI2 and ICN. The results are accounted for by the classical theory outlined here. This study adds a new dimension to femtosecond transition-state spectroscopy (FTS), namely the probing of the “vector dynamics” of reactions.
Subtlety in the reactivity of a diketo phosphorus ylide towards mercuric halides: the unprecedented O-coordination of α-acetyl-α-benzoylmethylenetriphenylphosphorane to Hg(ii)
作者:Parthasarathi Laavanya、Ulaganathan Venkatasubramanian、Krishnaswamy Panchanatheswaran、Jeanette A. Krause Bauer
DOI:10.1039/b104082k
日期:——
The reactions of the title ylide with HgX2 (X = Cl, Br or I) lead to the regiospecific binding of the acetyl oxygen to soft Hg(II), producing a chlorocomplex with (2 + 2) coordination and isostructural dimeric bromo and iodo complexes containing halogen bridges with tetrahedral configurations around the metal centres.
Femtochemistry of the reaction: IHgI*→[IHg…I]‡*→HgI+I
作者:R.M. Bowman、M. Dantus、A.H. Zewail
DOI:10.1016/s0009-2614(89)87108-8
日期:1989.3
Femtochemistry of the reaction IHgI*→[IHg…I]‡*→HgI+I is reported. We observe femtosecond decays with an oscillatory modulation. These observations are related to the reaction trajectories on the global PES, which involve a symmetric stretch, an antisymmetric stretch and a bend.
laser-induced crossed beam reactionI2* + Hg → HgI + I has been conducted at total energies ⩽ 4 eV (translational energies ⩽ 2.5 eV). The I2 molecules are prepared in the B (3Π0) state within the scattering region via 514.5 nm Ar+ laser excitation. The fraction of I2* molecules in the I2 beam was = 4×10−3. No significant yield of HgI in excess of that from the ground-state reaction was detected over the
The occurrence of deviations from stoichiometry of the semi-insulator compound HgI2 has been established using a very elaborate chemical analytical procedure. It was found that the molar ratio of I2Hg varies from 1.993 to 2.015 (±0.002). The deviations from stoichiometry have been corroborated by studying the red to yellow solid state phase transformation temperature. It was found that the compounds