Exam III

7-9pm

ISB 221

Exam 3: Avg (61) sd (20) high (95) low (5)

Discussion of photochemistry / photophysics as related to solar energy:

Accounts of Chemical Research 2003, 36, 876-887.  Read the stuff in the red boxes, and read the figure captions in order to understand the figures.

JimACR

Slides:

Goals: interpret electronic spectra of coordination compounds (dd/LMCT/MLCT); interpret reactions of Ru(bpy)32+* in context of ground states and excited states.

Discussion of photochemistry / photophysics as related to solar energy:

Accounts of Chemical Research 2003, 36, 876-887.  Read the stuff in the red boxes, and read the figure captions in order to understand the figures.

JimACR

Slides: Nov_28_inked

Goals: interpret electronic spectra of coordination compounds (dd/LMCT/MLCT); interpret reactions of Ru(bpy)32+* in context of ground states and excited states.

Chapter 11.  Catchup.  Electronic spectra of coordination compounds

Slides: Nov_21_inked

goals: Assign transitions as dd/CT with MO diagram;

Lots of homework answers!

Chapter 10: MT_Ch_10

Chapter 11:MT_Chapter_11_ImeanIT

Chapter 12:MT_Chapter_12

Coordination Chemistry – Electronic Spectra
Chapter 11: pp 419-421, 428-429, 437-438
HW: 12 (assume Del-oh is lowest energy transition), 15, 16, 17, 18, 21, 24, 25, 27,
Goals: Predict relative intensities of electronic transitions; distinguish dd, LMCT and MLCT; Distinguish excited states

Slides: Nov_18_inked
 

Ch 11: Coord Chem, electronic spectra

pp 409-418

HW: 1 2 3 4 5 6 7 8 9 10

Goals: Use Beers Law to calculate Abs; convert wavelength into wavenumbers; Derive ground state term symbols

Slides: Nov_16_inked

Chapter 10.  Coordination Chemistry: Bonding

Notes: Nov_14_inked

pages 388-389 (ONLY sigma-bonding in Td); 395-399; 399-402 (stop with the full paragraph discussing Fig 10.29b)

Goals: Construct MOs for distorted geometries; Calculate LFSE for Oh vs. Td; Memorize spectrochemical series

Coordination Chemistry – Bonding
Chapter 10: pp 377-384
HW: 17b 27 28 29

Slides:  Nov_9_inked (I had to make these fresh, as the ol’ calculatin’ machine emitted smoke and crashed).

Goals:  predict HS/LS based on pi bonding; Predict d-orbital splittings in distorted geometries; (sigma-bonding in Td symmetry)

Ligand Field Theory:  Don’t freak out when making the MO diagrams for coordination compounds.   We’ve focused on Oh symmetry for simplicity, but the principles never change.  Where you CAN get in trouble is if you try to memorize your way through the MO process – very dangerous!  Although the MO diagrams for coordination compounds are very complex if all the pi-bonding symmetry types are included, I decided that teaching would be more effective if I focused on just showing you how the pi-bonding LGOs of T2g symmetry affected the MO correlation diagram.

Remember to first make the sigma-bonding MOs (sigma and sigma-star); THEN let the pi-bonding be a perturbation, if your ligands support pi-bonding.  You know what the CFZone should look like, so it’s really just a question of how much the metal-based T2g orbitals ‘move up’ (for pi-donating ligands) or ‘move down’ (for pi-accepting ligands).  Finally, verify your d-electron count,and put these into the CFZone.

Coordination Chemistry – Bonding

Chapter 10: pp 369 – 380

HW: 10 16 18 19 20 21 22 23 24a 25

Slides: Nov_6inked

This will help you to visualize d-d transitions:  http://firstyear.chem.usyd.edu.au/calculators/dd.shtml

Goals: Draw accurate crystal-field splitting diagrams; Construct MOs for coordination compounds.

We got through CFT and sigma bonding LFT; we’ll talk about pi bonding LFT on Wednesday