Density Functional Theory for van der Waals Interactions

Award Information
Agency: Department of Health and Human Services
Branch: N/A
Contract: 1R43GM084555-01
Agency Tracking Number: GM084555
Amount: $103,249.00
Phase: Phase I
Program: SBIR
Awards Year: 2008
Solicitation Year: 2008
Solicitation Topic Code: N/A
Solicitation Number: PHS2007-2
Small Business Information
DUNS: 837635556
HUBZone Owned: Y
Woman Owned: Y
Socially and Economically Disadvantaged: Y
Principal Investigator
 (412) 687-0695
Business Contact
Phone: (412) 687-0695
Research Institution
DESCRIPTION (provided by applicant): Q-Chem is a state-of-the-art commercial quantum chemistry program that is used to model atomic and molecular processes over a wide range of disciplines, including biology, chemistry, and materials science. Among the qua ntum chemistry methods, density functional theory (DFT) is perhaps the most widely used, especially in molecular biology, due to its ability to accurately model a wide range of molecular systems with reasonable computational cost. Still, DFT does not inclu de the dispersion correlation effect, or van der Waals interaction, which plays a critical role in the determination of the overall conformations of molecular systems and accordingly, is indispensable in the study of DNA and proteins, molecular recognition , the packing of crystals, etc. We propose to add the ability to accurately model dispersion effects within the DFT framework. Specifically, we will develop and implement self-consistent-field (SCF) and gradient solutions to a recently proposed dispersion model, which has been shown to yield very accurate dispersion coefficients for R-6 and higher order terms with no empirical parameters, and very accurate binding energies for weakly bound systems and relative conformation energies with a damping term of ju st two empirical parameters. Currently this model cannot be applied in practical studies because it can only be used to calculate molecular energies due to the lack of SCF and gradient algorithms. The successful development and implementation of the model will lead to much more reliable DFT solutions for real chemical and biological problems. PUBLIC HEALTH RELEVANCE: This project aims to develop and implement a very accurate DFT method. DFT is at the core of molecular modeling and is applied widely i n biological research/development and in drug discovery. The improved DFT will significantly increase researchers' quality of work and extend the application scope of DFT.

* Information listed above is at the time of submission. *

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