Where Can I Find a Reliable Dihedral Angle Database for Computational Chemistry?

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Discussion Overview

The discussion revolves around the search for a reliable database of dihedral angles specifically for methyl formate within the context of computational chemistry. Participants explore various sources and methods to obtain this information, focusing on the challenges of finding accurate data for coordinate system transformations.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant expresses the need for dihedral angles for methyl formate and mentions unsuccessful attempts to find this information in various databases.
  • Another participant questions the need for a specific dihedral angle, suggesting that the methyl group may rotate freely, indicating a lack of a single preferred angle under standard conditions.
  • A suggestion is made to consider a crystallographic database as a potential source for the required information.
  • A further participant recommends the CCCBDB as a useful resource for tabulating ab initio and gas phase spectroscopic data, providing a link to the database.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a specific source for dihedral angles, and there are differing opinions on the nature of the dihedral angles for methyl formate, particularly regarding the rotation of the methyl group.

Contextual Notes

The discussion highlights the uncertainty surrounding the availability of dihedral angle data and the assumptions regarding the rotational freedom of the methyl group, which may affect the interpretation of the required angles.

Who May Find This Useful

Researchers and practitioners in computational chemistry, particularly those working on molecular modeling and coordinate transformations.

rmiller70015
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I am working on a computational project and I need to make a series of coordinate system transforms. To do this I will need the dihedral angles for methyl formate, but I cannot find this information anywhere. I've tried the CRC handbook, NIST chemical database, and other data bases, but I can't seem to locate one. I need to know if there is a good, reliable source of dihedral angles that someone has compiled.
 
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Can you specify (perhaps w/ a drawing or diagram) which bond you want dihedral angles for? The methyl group should be freely rotating, so I'm not sure there is a single preferred angle at standard temperature and pressure.
 
Crystallographic database?
 
CCCBDB does a pretty good job tabulating ab initio and gas phase spectroscopic data:

http://cccbdb.nist.gov
 

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