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Molecular Complexes of Organometallic Molecules with Noble Gases: The Rotational Spectrum of Dimethylsilane–Argon
Author(s) -
Ottaviani Paolo,
Melandri Sonia,
Caminati Walther,
Banser Deike,
Schnell Melanie,
Grabow JensUwe
Publication year - 2004
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200400191
Subject(s) - dimethylsilane , chemistry , argon , atom (system on chip) , molecular beam , atomic physics , spectroscopy , molecule , rotational spectroscopy , krypton , molecular physics , physics , organic chemistry , quantum mechanics , computer science , embedded system
The rotational spectrum of the molecular complex dimethylsilane–argon was investigated by free‐jet absorption millimeter‐wave and molecular‐beam Fourier transform spectroscopy. The absolute energy minimum corresponds to a conformation in which the argon atom lies in the plane of symmetry of dimethylsilane, perpendicular to the CSiC plane. The distance of Ar from the center of mass of dimethylsilane is 3.90 Å, and the Ar atom is tilted 14° away from the Si atom. The zero‐point dissociation energy was estimated from the centrifugal distortion constant D J to be 2.2 kJ mol −1 . Small splitting, due to tunneling of the Ar atom and internal rotation of the two methyl groups, was observed, measured, and used to determine the potential energy surface for these motions.