INFRARED SPECTRA AND FORCE CONSTANTS OF 116SnCl4^{116}SnCl_{4} AND 124SnCl4^{124}SnCl_{4}

Author Institution: Institut fur Chemie der, Universit\""{a}t Dortmund; Department of Chemistry, Marquette UniversityThe infrared spectra of gaseous $^{116}SnCl_{4}$ and $^{124}SnCl_{4}$ have been measured. From the isotope shift of ${\nu}_{3}(F_{2})$ the force constants of $SnCl_{4}$ have been calculated and compared with those obtained by using other data such as vibrational amplitudes and Coriolis coupling constants. It has been shown that the metal isotope substitution can be used for the calculation of force constants with reasonable error limits. From the exact force field of the tetrahedral molecule the vibrational frequencies of $^{116}Sn^{35}Cl_{3}^{37}Cl, ^{116}Sn^{35}Cl_{2}^{37}Cl_{2}$ and $^{116}Sn^{35}Cl^{37}Cl_{3}$ have been calculated. These frequency data allow an interpretation of the band contours of the ${\nu}_{3}(F_{2})$-fundamental of $^{116}SnCl_{4}$ and $^{124}SnCl_{4}$