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We study ionic liquids composed 1-alkyl-3-methylimidazolium cations andbis(trifluoromethyl-sulfonyl)imide anions ([C$_n$MIm][NTf$_2$]) with varyingchain-length $n\!=\!2, 4, 6, 8$ by using molecular dynamics simulations. Weshow that a reparametrization of the dihedral potentials as well as charges ofthe [NTf$_2$] anion leads to an improvment of the force field model introducedby K\"oddermann {\em et al.} [ChemPhysChem, \textbf{8}, 2464 (2007)] (KPL-forcefield). A crucial advantage of the new parameter set is that the minimum energyconformations of the anion ({\em trans} and {\em gauche}), as deduced from {\emab initio} calculations and {\sc Raman} experiments, are now both wellrepresented by our model. In addition, the results for [C$_n$MIm][NTf$_2$] showthat this modification leads to an even better agreement between experiment andmolecular dynamics simulation as demonstrated for densities, diffusioncoefficients, vaporization enthalpies, reorientational correlation times, andviscosities. Even though we focused on a better representation of the anionconformation, also the alkyl chain-length dependence of the cation behavescloser to the experiment. We strongly encourage to use the new NGKPL forcefield for the [NTf$_2$] anion instead of the earlier KPL parameter set forcomputer simulations aiming to describe the thermodynamics, dynamics and alsostructure of imidazolium based ionic liquids.

Revisiting Imidazolium Based Ionic Liquids: Effect of the Conformation Bias of the [NTf$_{2}$] Anion Studied By Molecular Dynamics Simulations