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herich
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Homework Statement
Arrange the nitrogen atoms of histamine in order of their decreasing basic strength.
http://img134.imageshack.us/img134/7339/histamine.th.jpg
Homework Equations
The more ready the nitrogen atoms donate lone pair, the greater the basicity;
The Attempt at a Solution
The rightest one must be the most basic.
But how about the other two? It must be related to resonance. But I just don't know how to work out the answer by drawing the resonance structure (how to draw this one~?)
* one more simple question: when a metal ion (say Cu2+) forms a complex with EDTA, what is the coordination no.? (count the no of ligand - 1 or the dative bond - 6 ?)
Thanks!
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