[gmx-users] Imidazolium ring opening during energy minimization

[Meena Singh]

Dear GROMACS users,

I am trying to simulate box of 1-ethyl-3-methylimidazolium ion (5-membered
ring with overall +1 charge) with its counter ion tetrafluoroborate.
I am using OPLS forcefield.
Partial charges and potential parameters have been taken from research
paper.
But during energy minimization 5-membered ring of all molecules of
imidazolium ion  is getting opened by breaking a bond between N (attached
to ethyl group in ring) and C (attached to other C in ring)


Does anyone have a suggestion to help me with this problem?

-- 
*With Regards,*
*Meena Singh*
*Ph. D. Research Scholar*

*Chem Engg Dept,*
*Institute of Chemical Technology*