Direct and Simple Experimental Crystallographic Method to Calculate Partial Charges with Atomistic Correspondence to ab-initio Methods

Presented During:

08/03/2020: 4:00 PM  - 5:00 PM 
Virtual  

Conference:

2020: 70th ACA Annual Meeting

Session Type:

Poster 

Presenting Author :

Prabhat Prakash  
Temple University

Additional Author(s):

Alex Byrne  
Temple University
Taylor Keller  
Temple University
Michael Zdilla  
Chemistry, Temple Univ

Abstract Body:

Derivation of partial charges in small and large scale molecular systems is important for modeling of various experimental and theoretical properties like dipole moments, auto-correlation functions, charge disparity, understanding of dispersion, benchmark of classical MD simulations and electrostatic potential energy surface mapping. A correspondence between theoretical calculations (based on single/small number of molecules) is usually established with macroscopic IR/Raman spectra or dipole moment measurements. Such comparisons are indirect and lack a fine mapping of electrostatic potential from theory to experiment. In a new approach developed as the experimental part of this work, partial charges are calculated from crystallographic model refinement. The experimental method exhibits a satisfactory correspondence with partial charges obtained using quantum chemistry calculations. Particularly, gas phase partial charges from CHELPG method and condensed phase Lowdin charges correlate well and validate this experimental method.

Additional Information - Poster

If submitted for a poster would you like to be considered for a poster prize?

Yes

If yes, which poster prize?

Journal of Chemical Crystallography