[darkdevil]

Hi, I wonder why is this a conjugated polymer? I cannot draw the electron flow/ resonance from one end to another end within the monomer.

[discodermolide]

There are lots of resonance structures you can draw with such a monomer. Try invoking the lone pair on the nitrogen.

[darkdevil]

There are various resonance structures I can draw within the monomer. But How is it possible for the electrons to flow from one monomer to another in polymer PIII? while I expect this polymer to be a main chain conducting polymer

[discodermolide]

Well I am not a polymer expert, but you can still invoke the N lone pair in the polymer. It may well be conducting, but as I said I'm not a polymer chemist.

[darkdevil]

Well I just realized something strange.. For example, I can draw electron flow throughout the polymer of poly(p-phenylene). But I cannot do that in poly(m-phenylene)! So weird and I suppose both of them are conducting polymers. THe problem is I cannot draw an electron flow throughout the monomers within the Polymer.

[discodermolide]

Invoke the N lone pair and move them towards the phenyl ring on the right, as drawn, through onto the C=N and into the pyridine ring.
I can try and draw it if you wish.

[darkdevil]

Would you please draw it for me?

[discodermolide]

This is what I was thinking of. Note the charges on the nitrogen atoms.

[darkdevil]

Thank you so much..
Now I am wondering if poly(m-phenylene) is polyconjugated?? since it has no heteroatoms to make separate charges.

[discodermolide]

I doubt it as aromatic systems using resonance structures usually employ the ortho and para positions, which is why they are easy to substitute in electrophillic substitution reactions, meta substitution is a bit harder to achieve.