[Avogadro-Discuss] Inability to calculate carbon dioxide dipole moment?

2013-01-19 Thread Steven Petrovic
Hello, Despite how wonderful I think Avogadro is for molecular modeling and its potential for educational purposes, I hesitate to use Avogadro in the chemistry laboratory when there seems to be such glaring issues as predicting the dipole moment for simple inorganic molecules such as carbon dioxide

Re: [Avogadro-Discuss] Inability to calculate carbon dioxide dipole moment?

2013-01-19 Thread Marcus D. Hanwell
On Sat, Jan 19, 2013 at 12:31 PM, Steven Petrovic wrote: > Hello, > Despite how wonderful I think Avogadro is for molecular modeling and its > potential for educational purposes, I hesitate to use Avogadro in the > chemistry laboratory when there seems to be such glaring issues as > predicting the

Re: [Avogadro-Discuss] Inability to calculate carbon dioxide dipole moment?

2013-01-21 Thread Noel O'Boyle
To be clear, are you asking why MMFF94 is so poor at predicting dipole moments? - Noel On 19 January 2013 17:31, Steven Petrovic wrote: > Hello, > Despite how wonderful I think Avogadro is for molecular modeling and its > potential for educational purposes, I hesitate to use Avogadro in the > ch

Re: [Avogadro-Discuss] Inability to calculate carbon dioxide dipole moment?

2013-01-21 Thread Marcus D. Hanwell
Noel - do some of the other Open Babel force fields do a better job at this? Marcus On Mon, Jan 21, 2013 at 8:59 AM, Noel O'Boyle wrote: > To be clear, are you asking why MMFF94 is so poor at predicting dipole > moments? > > - Noel > > On 19 January 2013 17:31, Steven Petrovic wrote: >> Hello,

Re: [Avogadro-Discuss] Inability to calculate carbon dioxide dipole moment?

2013-01-21 Thread Geoffrey Hutchison
> To be clear, are you asking why MMFF94 is so poor at predicting dipole > moments? No, he's commenting on a bug. O=C=O clearly should have approximately 0.0D dipole moment. Regardless of the charges on the individual atoms, the charges should cancel in a symmetric molecule. I have no idea the