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17 Nov 2019
Consider the molecule PCl_3Br_2 How many vibrational modes (stretching and deformations) should there be in PCl_3Br_2. Determine the electron group and molecular geometry for PCl_3Br_2. Sketch three possible isomers for this molecule. Indicate whether each isomer is polar or non-polar and indicate the direction of the net molecular dipole moments on your sketches. Determine the point groups for each of the three possible isomers. Clearly indicate symmetry elements on each of your sketches as well as a set of Cartesian axes. An NMR experiment determines that the bromine atoms are in identical, symmetry-related environments (i.e. are chemically equivalent), thus ruling out one of the isomers as a possible structure. Which one? The vibrational stretching modes for the P-Cl bonds are specifically studied using FTIR spectroscopy. Use stretching mode analysis to determine the reducible representations, Gamma P-Cl, for the P-Cl bonds and thus the number of observable v_P-Cl resonances in the FTIR spectrum that would one might expect to see for the remaining two isomers. Would one be able to distinguish between the two isomers from this spectral analysis? Based on steric (VSEPR) arguments, rationalize which of these two possible isomeric structures is likely to be the most stable. For your choice of most stable isomer, sketch the vibrational modes and assign symmetry labels.
Consider the molecule PCl_3Br_2 How many vibrational modes (stretching and deformations) should there be in PCl_3Br_2. Determine the electron group and molecular geometry for PCl_3Br_2. Sketch three possible isomers for this molecule. Indicate whether each isomer is polar or non-polar and indicate the direction of the net molecular dipole moments on your sketches. Determine the point groups for each of the three possible isomers. Clearly indicate symmetry elements on each of your sketches as well as a set of Cartesian axes. An NMR experiment determines that the bromine atoms are in identical, symmetry-related environments (i.e. are chemically equivalent), thus ruling out one of the isomers as a possible structure. Which one? The vibrational stretching modes for the P-Cl bonds are specifically studied using FTIR spectroscopy. Use stretching mode analysis to determine the reducible representations, Gamma P-Cl, for the P-Cl bonds and thus the number of observable v_P-Cl resonances in the FTIR spectrum that would one might expect to see for the remaining two isomers. Would one be able to distinguish between the two isomers from this spectral analysis? Based on steric (VSEPR) arguments, rationalize which of these two possible isomeric structures is likely to be the most stable. For your choice of most stable isomer, sketch the vibrational modes and assign symmetry labels.
Sixta KovacekLv2
13 Nov 2019