VIBRATIONAL ANALYSIS AND NORMAL COORDINATE ANALYSIS OF METHYLSTANNANE

Author Institution: Department of Chemistry Brooklyn CollegeThe infrared spectra of $CH_{3}SnH_{2}, CH_{3}SnD_{3}$, and $CD_{3}SnH_{3}$ have been obtained in the region $4000-250 cm^{-1}$. Coriolis constants for $CH_{3}SnH_{2}$ and $CD_{3}SnH_{3}$ were obtained from analyses of their vibration-rotation spectra. Fundamental and combination bands have been assigned and the assignments were confirmed using the Product Rule. The inactive torsional vibration ($A_{2}$ species) was calculated from the barrier to internal rotation and confirmed by assignments of combination bands. The normal coordinate analysis was performed using the Hybrid Orbital Force Field. The potential energy distributions show that except for the $CH_{3}$ rocking mode, the $CH_{3}$ vibrations can be regarded as ``group vibrations''. Coriolis constants were calculated and compared with the observed values

FORCE CONSTANT CORRELATIONS FOR CH3XH3CH_{3}XH_{3} MOLECULES.

Author Institution: Department of Chemistry, Brooklyn CollegeAn investigation of the nature of ``group vibrations'' has been made by means of comparisons of the hybrid orbital force constants of $CH_{3}SiH_{3}, CH_{3}GeH_{3}$ and $CH_{3}SnH_{3}$. Empirical relationships have been formulated which permit the transfer of force constants between the molecules of this series using the C-H and X-H bond lengths as the only parameters. Some preliminary results indicate that these empirical relationships can be extended to include molecules not in the $CH_{3}XH_{3}$ series

Chemistry reactions, structure, and properties

xvi, 654 p.; 25 cm

Experimental chemistry a laboratory manual for principles of chemistry

iv+87hlm.;28c