Organic Nomenclature Active Learning Worksheet

Submitted by Shirley Lin / United States Naval Academy on Sun, 06/26/2016 - 15:22
Description

This worksheet was designed to give students an introduction to organic chemistry nomenclature with a more active experience than listening to a faculty member present all the rules for how to name alkanes and cycloalkanes. The pedagogical approach is one introduced to me by Dr. Melonie Teichert; we refer to it as ICC (Inventing through Contrasting Cases). The theoretical framework involves the premise that students will learn and retain more of the learning if they're not simply told the "answer" but if they attempt to generate an answer for themselves based upon a data set.

Historical overview of Evans method

Submitted by Adam Johnson / Harvey Mudd College on Wed, 06/08/2016 - 20:08
Description

This LO grew out of my interest in understanding (deeply) the machinery behind the Evans method calculations. I did these calculations as a grad student to characterize my compounds, and I teach it in both my lecture and lab. Currently I use the metal acac synthesis lab to motivate the problem.

magnetism by Evans method

Submitted by Adam Johnson / Harvey Mudd College on Tue, 05/31/2016 - 16:27
Description

After I teach my students about magnetism and magnetic properties in coordination compounds, I spend a day showing how the data is collected and analyzed. I teach them about the Gouy balance, the Evans method of determining magnetism by NMR, and SQUID magnetometry. I also show them real data that I collected as an undergraduate or graduate student, and have them interpret and analyze it.

The only experiment that we can do locally is the Evans method, so I spend more time on this technique. We use the method during the metal acac laboratory.

Ligand effects in titration calorimetry from the Angelici lab

Submitted by Chip Nataro / Lafayette College on Mon, 05/23/2016 - 21:08
Description

This literature discussion focuses on a paper from the Angelici lab that examines the heat of protonation of [CpʹIr(PR3)(CO)] compounds. The compounds presented in the paper provide good introductory examples for electron counting in organometallic compounds. The single carbonyl ligand in these compounds provide an excellent probe to monitor the electron richness at the metal center which is impacted by the electron donor ability of the ligands.

soapmaking activity

Submitted by Adam Johnson / Harvey Mudd College on Sat, 05/14/2016 - 22:36
Description

This in-class activity is designed to follow the linked lecture/demonstration on soapmaking. The soaps cure enough to be handled in 48 hours if kept warm, and the students can feel the difference in the canola/coconut oil soaps.

The calcuations go through the major reactions, functional groups, and physical properties of soap molecules, and ends with the calculation of molecular weight for a mixture of substances. This could be related to a later polymer unit.

soapmaking lecture/demo

Submitted by Adam Johnson / Harvey Mudd College on Sat, 05/14/2016 - 22:26
Description

This is a short presentation that outlines the major chemical reactions of soapmaking. Included are instructions for making two soaps, one from canola oil, the other from coconut oil. These two soaps have very different hardnesses, which can be explained by examining the structures of the oils. If you have never made soap before, it isn't that difficult, but it does use concentrated NaOH so is very caustic before the reaction is done. The linked websited have good instructions for soapmaking as well.

Ligand Field Correlations for Square Pyramidal Oxovanadium(III)

Submitted by Matt Whited / Carleton College on Fri, 04/22/2016 - 10:37
Description

Students work in groups to derive the ligand-field diagram for a square-pyramidal vanadium(III) oxo complex using octahedral V(III) as a starting point. The activity helps students to correlate changes in orbital energies as a function of changing ligands and geometry as well as rationalizing why certain geometries can be particularly good (or bad) for particular complexes. The activity also helps students see why oxo complexes of early metals are frequently best described as triple bonds.

Mix and Match Ligand Group Orbitals and Metal Orbitals

Submitted by samuelson / Indian Institute of Science on Thu, 03/31/2016 - 00:34
Description

Students are often presented with the finished MO correlation diagrams of molecules like bis benzene chromium or ferrocene in classes and in organometallic chemistry text books. This activity helps them match the ligand group orbitals of the two benzene rings with the metal valence orbitals. Their understanding and appreciation of such diagrams is significantly enhanced when they find out how only some matches have the appropriate symmetry requirements.

d orbital splitting in Trigonal Pyramidal Field

Submitted by Sheila Smith / University of Michigan- Dearborn on Sat, 02/27/2016 - 12:55
Description

This is a short critical thinking exercise that I use to assess whether my students have understood where the d orbital splitting in Octahedral and Tetrahedral geometry  comes from.  I do it at the beginning of the class after we discuss CFT/LFT in Oh and Td compounds.