Jump to content
Science Forums

Chemistry 101


learnin to learn

Recommended Posts

Who can propose a tetradentate ligand with a -4 charge such that three of them chelate two Co(3+) to give a helicate complex as described below?

 

Uncle Al likes salts of chiral complex ions with geometrically (nearly) identical cations and anions. Example: Resolved [Co(en)3](3+) is almost exactly superposable upon [Co(ox)3](3-),

 

http://www.mazepath.com/uncleal/xions.png

stereoimages

 

to make the two mirror-image salts,

 

http://www.mazepath.com/uncleal/xsalt.png

stereoimages

 

One can get very clever and create helicates by linking bidentate ligands. Here we look at homochiral [Co(phen)3](3+) and [Co2(bisphen)3](6+)

 

http://www.mazepath.com/uncleal/xheli.png

stereoimages

 

It obviously works for [Co(bipy)3](3+) and [Co2(bisbipy)3](6+), too. Now for the fun part! Who can propose a helicate ligand that will give isomorphous [Co2(ligand)3](6-)?

 

Don't be shy!

Link to comment
Share on other sites

Who can propose a tetradentate ligand with a -4 charge such that three of them chelate two Co(3+) to give a helicate complex as described below?

 

Uncle Al likes salts of chiral complex ions with geometrically (nearly) identical cations and anions. Example: Resolved [Co(en)3](3+) is almost exactly superposable upon [Co(ox)3](3-),

 

http://www.mazepath.com/uncleal/xions.png

stereoimages

 

to make the two mirror-image salts,

 

http://www.mazepath.com/uncleal/xsalt.png

stereoimages

 

One can get very clever and create helicates by linking bidentate ligands. Here we look at homochiral [Co(phen)3](3+) and [Co2(bisphen)3](6+)

 

http://www.mazepath.com/uncleal/xheli.png

stereoimages

 

It obviously works for [Co(bipy)3](3+) and [Co2(bisbipy)3](6+), too. Now for the fun part! Who can propose a helicate ligand that will give isomorphous [Co2(ligand)3](6-)?

 

Don't be shy!

 

 

wow, so, this is what I've gotten myself into.

 

*gulp*

Link to comment
Share on other sites

wow, so, this is what I've gotten myself into.

In September 1969 1200+ students enrolled in MSU organic chemistry/majors. 350 made it to the second term. 17 graduated BS/Chem. Elitism insists the better is preferable to the worse. Uncle Al is an elitist, as were the other 16.

 

Evolution is a hoot if you are one of the survivors.

Link to comment
Share on other sites

Moo U, Michigan State. In 1969 the Chemistry building was newly constructed - almost a square block of stuff. 5.5 stories tall, three stories deep, and a lot of the basement labs had lead-lined doors. Great scientific glassblowing course.

 

Don't go there. Out-of-state students are vigorously screwed from the moment their feet touch the campus. Summers are hellacious heat, humidity, and mosquitoes.

Link to comment
Share on other sites

What do you do for a job UncleAl?

Industrial organic chemist: fine and exotic synthesis, CAD molecules; insect ecdysteroid mimesis; human implantable prostheses, radiation grafting, hydrogels, and medical polymers; novel routes to ambient pressure diamond synthesis.

 

Management, "GODDAMN IT, Schwartz, it CAN'T work that way!"

Uncle Al, "but it does"

 

I have a 1450 carat Type IIb "diamond" (glass paperweight) on my desk courtesy of my current CFO. It could happen - they want bulk abrasive. Huge gems would be deliciously insubordinate.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...