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Dec 25, 2018 at 13:36 history edited orthocresol CC BY-SA 4.0
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Jun 19, 2015 at 15:38 comment added diffracteD Actually I'm dealing with full amino acid chain from protein crystal structure. That's why I ask, if I truncate the whole thing except the particular section I'm intending to find i.e. N-H...O-C, then would it serve well ? (the example I put on there was just an analogy)
Jun 19, 2015 at 15:33 comment added LordStryker Is your system an entire crystal structure or protein? No its not though given the location of your comment it was easy for me to assume this. Your system is small enough you would not have to cap anything and I would recommend that you characterize the full thing.
Jun 19, 2015 at 15:31 comment added diffracteD If I got a structure(chain) looks like, say, H3C-CH2-N-H...O-C-CH(CH3)-CH3. And if I want to get the energy between N-H...O-C. Then is it sensible to use only that concerned part(i.e. N-H...O-C) with the strict-geometry I have ?
Jun 19, 2015 at 15:26 comment added LordStryker You cannot model an entire crystal structure, protein, etc. with a method that can reasonably quantify $\pi$-$\pi$ interactions with acceptable accuracy as this would be computationally intractable. You would have to cap your system somewhere.
Jun 19, 2015 at 15:23 comment added diffracteD explanation is highly motivating. But I got some basic query. What if I use only the aromatic geometry here and truncate everything else, i mean why I need to cap ? Given that this is an amino acid chain, polarizibility won't be so high in this case may be.
Jun 17, 2015 at 16:01 history edited LordStryker CC BY-SA 3.0
minor tweaks
Apr 26, 2012 at 19:52 history edited LordStryker CC BY-SA 3.0
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Apr 26, 2012 at 2:12 history edited LordStryker CC BY-SA 3.0
added 1 characters in body
Apr 25, 2012 at 21:12 history edited LordStryker CC BY-SA 3.0
added 437 characters in body
Apr 25, 2012 at 21:00 history edited LordStryker CC BY-SA 3.0
Forgot to mention basis sets.
Apr 25, 2012 at 20:54 history edited LordStryker CC BY-SA 3.0
Forgot to mention basis sets.
Apr 25, 2012 at 20:48 history answered LordStryker CC BY-SA 3.0