Question

12:18 PM Wed Mar 18 26% HW5_due 03.18.2020 CHEM 325, Hw5 Due: in class, March 11, 2020 The molecule we are studying is (-arene)CH(CO), and the structural is shown as below 1. Determine the point group of the molecule and it should be C. Cav: C, Ov, sz 2. Here is the character table of C and label the principal axis Cs and the vertical reflection planes oy in the molecule. (Hint: The three CO form a triangle plane.) Cy E 20, 30, 1 x² + y2 2 -1 0 (x,y). (R, R) - y.xy). (xz, yz) 3. Generate the reducible representation for the three CO vibrations: (Hint: the three Cr.co stretching are treated as three axes like the ones we did for B-F in BF, molecules) Stepl: Index cach CO as 1,2,3 Step 2: Perform the symmetry operations E, C3, Ov, respectively, and draw the molecule after symmetry operations with the index of CO Step 3: Determine the characters (if the axis Cr-CO stays the same, the character is 1: if the axis Cr.Co changes location, the character is the character you fill in should be the sum of all three Cr-Co bonds) 20 E A1 4. Now reduce the reducible representation to its irreducible components (A., As, or E) using the character table and the following equation: 1 of 2

Answer 1

it does not have S3 as there is no horizontal plane of symmetry.

@ It does not have any plane of symmetry in a plane perpendicular to principal axis of syrometry It have a axis perpendicular to benzene plane and passes through its centre and Co atom - principal axis ez 6 Benzene have symmetry at every angle of 60° (it have Caxis) so it will have a g too, Below on er 3 co in pyramidal shape also have eg axis (120°C). So They both match geometrically so the whole system have g anis 16 those planes containing On Cr and one co and passes through opposite (diagonally of besser is a su plane. 3 such o are there so 305 : So poinst group-Gr