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Polarization and nucleophile strength

Posted: Tue Feb 28, 2017 11:17 pm
by Nick_Kopooshian_3C
I know that the more polarizable species are, the stronger the nucleophile is, but I'm not too sure about the general trend of polarizability across the periodic table. Can someone please help me out?

Re: Polarization and nucleophile strength

Posted: Wed Mar 01, 2017 12:15 am
by Liam Giffin 2B
Larger atoms in the same group are more polarizable. For example Bromine is more polarizable than Fluorine, so Br- is a stronger nucleophile than F-. I'm pretty sure the trend isn't as definite as for some other things, but definitely the elements towards the bottom right of the period table are the most polarizable.

Re: Polarization and nucleophile strength

Posted: Thu Mar 02, 2017 9:37 pm
by Vivian Nguyen 2A
I think it'd be helpful to review the first couple of chapters from Chem14A to get a refresher on the polarizability of atom! Typically, atoms will larger atomic radii (those towards the bottom of the periodic table) have more loosely bonded electrons and therefore have electrons more readily available to be involved in a reaction.

Re: Polarization and nucleophile strength

Posted: Thu Mar 02, 2017 10:39 pm
by Kathy Vu 3L
The more polar a molecule, the more regions of electron density. Therefore, these regions of molecules act as a nucleophile.