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- 1- Order the highest to lowest frequency of vibration in the infrared (IR) region of the following infrared groups, justifying the answer based on infrared spectroscopy.The stretching frequencies for H2, HD, and D2 are 4395, 3817, and 3118 cm-1 respectively. Why? Explain.Give clear handwritten answer- For which irreducible representation do the following vibrational modes form a basis?
- Determine the IR-active CO stretch vibration modes for the following molecules. Show procedures and calculations. a) fac-Fe(CO)3Cl3 b) Fe(CO)5 (triagonal bipyramid)Determine the irreducible representations for the normal mode vibrations of benzene, and determine how many IR-active vibrations benzene has.How many degrees of vibrational freedom does Al2Cl6 possess? Use the D2h character table to determine the symmetries of the IR active stretching modes of vibration.
- For the NF2- anion:determine the total number of vibrations, their irreducible symmetries, and indicate which are IR-active.Shown below are six normal mode vibrations of the formaldehyde molecule. The arrowsshow the direction of vibrational motion for the atoms involved in the vibration. Assign each of the modesto the correct symmetry species of the appropriate point groupPlease identify and assign the major stretching vibrations for acetyl eugenol.
- What are the conditions for a molecule to be Raman active, IR active.The structure of [NO3]-is either trigonal planar or trigonal pyramidal draw both possible structures and determine the point group for each. Which irreducible representations represent the translational and rotational modes for each possible structure of [NO3]-? Which irreducible representations correspond to the vibrational modes for each possible structure of [NO3]-? How many degrees of freedom would you expect for each structure of [NO3]-? Calculate T-vibrationaland determine which modes you expect to be IR active for each structure.The question is complete ... for which absorption process the carrier is taken to a higher level of conduction band ?