UCF Chemistry

People » Artem Masunov


February, 2010: Dr. Artëm Masunov (Assistant Professor, Joint NSTC & Chemistry) will serve as a Co-PI on a new $1.8 Million 4-Year Collaborative Research in Chemistry Grant from NSF titled Self-Organized Aggregates in Photonics (SOAP): A Comprehensive Approach to Multiphoton Absorbing Supramolecular Assemblies (PI: Dr. Kevin Belfield, Professor and Chair, Department of Chemistry). See here for more information.

February, 2010: Congratulations to Dr. Artem Masunov (joint NSTC & Chemistry faculty) for winning the American Chemical Society’s Hewlett Packard Outstanding Junior Faculty Award for the abstract titled: The Comparison of Sum over States (SOS) and Coupled Electronic Oscillator (CEO) formalisms used for computational design of Two Photon Absorbing materials with Time-Dependent Density Functional Theory. This award is presented to only 4 individuals annually and is designed to assist new faculty members in gaining visibility within the Computers in the ACS Division of Computers in Chemistry (COMP) community. This award will be granted to Dr. Masunov at the Aug 17th ACS meeting in Philadelphia.

February, 2010: Dr. Sudipta Seal and Dr. Artem Masunov recognized by National Science Foundation The research of Drs. Seal and Masunov is featured in a Behind the Scenes look from LiveScience.com. Their work is also featured on the ORC web page and on the NSF website.

February, 2010: Dr. Artëm E. Masunov was recognized with the International Journal of Quantum Chemistry Young Investigator Award for his work on “Combined descriptions of the valence excited states based on Density Functional Theory: TD-DFT with eDFT excitation energy corrections”. The ceremony will take place at the 50th Sanibel Symposium to be held at St. Simons Island, GA in February 2010.

October, 2008: New $1.8 Million 4-Year Collaborative Research in Chemistry Grant from the National Science Foundation!Self-Organized Aggregates in Photonics (SOAP): A Comprehensive Approach to Multiphoton Absorbing Supramolecular Assemblies. A comprehensive Nanoscience & Molecular Engineering research program.Principal Investigator: Kevin D. Belfield, Professor and Chair, Department of Chemistry and CREOL: The College of Optics and Photonics, University of Central Florida, Belfield@mail.ucf.edu , http://belfield.cos.ucf.edu/ .Co-Principal Investigator: Florencio E. Hernandez, Associate Professor, Department of Chemistry and CREOL: The College of Optics and Photonics, University of Central Florida, florenzi@mail.ucf.edu, http://chemistry.cos.ucf.edu/faculty_hernandez.php.Co-Principal Investigator: Artëm E. Masunov, Assistant Professor, Nanoscience Technology Center and Department of Chemistry, University of Central Florida, amasunov@mail.ucf.edu, http://chemistry.cos.ucf.edu/faculty_masunov.php.Co-Principal Investigator: Tatiana V. Timofeeva, Research Professor, Department of Chemistry, New Mexico Highlands University, tvtimofeeva@nmhu.edu, http://its.nmhu.edu/personal/chemistry/personal-tatiannatimofeeva.html

Theoretical and experimental study on H-bonded aggregation: toward rational control over amyloid fibril formation.

Amyloid fibril is a form of protein self-assembly of 8-13 nm in diameter and several μm in length, where ß-strands are arranged perpendicular to the axis of the fibril, and ß-sheets ran parallel to it. In vivo their formation had been associated with spider silk and several “diseases of protein misfolding”: Alzheimer’s and Parkinson’s diseases, where protein looses its native a-helical structure and aggregates. In this project we use molecular simulations to describe non-additive hydrogen bonding in aqueous solution, and build detailed kinetic model with reliable protein-specific parameters for each step of the mechanism. Based on this model, we design small molecules which are able to terminate fibril growth and slow down the progress of the disease.

Figure: Quantum Chemistry of Quantum Dots: HOMO calculated at DFT level (B3PW91/ LANL2mb) in Cd_32Se_14(SeH)_36(PH_3)_4, the cluster modeling colloidal quantum dot of 2 nm in diameter. Electronic structure of quantum dots strongly depends on passivating ligands.

Biomedical use of two-photon absorption: computer-assisted design of non-linear optical materials for photodynamic therapy and fluorescent labels.

Two-photon (TP) fluorescent microscopy employs nonlinear optical process when molecule simultaneously absorbs two photons and emits one. It has a number of advantages over the standard (linear) microscopy, including high three-dimensional resolution (due to quadratic dependence on intensity), and increased penetration depth in tissue with reduced photodamage (by operating with incident light in the visible red-NIR region). These allow for real-time imaging of the living tissue, if effective TP absorbing chromophores are introduced into it. In this project we apply virtual screening and combinatorial chemistry methods to design better TP chromophores. Recently we developed a novel approach to prediction of non-linear optical properties, based on Time-Dependent Density Functional Theory. It gives accurate TP cross-sections for large conjugated molecules. We are improving the accuracy of this method further by taking into account vibrational line broadening, and selecting significant molecular descriptors for nonlinear optical properties. Based on these descriptors, new molecules will be designed from molecular fragments collected in a virtual library and suggested as candidates for an experimental study.

Among the findings of my past research projects are: first topological analysis of experimental electron density in crystal, local models of superconductivity in cuprates, understanding the role of secondary bonds in structures of inorganic dihalides and molecular crystals, ab initio prediction of polymorph relative stability, first comprehensive molecular dynamics study of potential of mean force between ionizable aminoacid sidechains in aqueous solution, development of intermediate (between micro- and macroscopic) solvation model, extension of Density Functional Theory to strongly correlated systems, and discovery of counterion-induced charge transfer excited states of organic chromophores in aqueous solution.

Select Publications

  1. Masunov A., Tretiak, S. Prediction of two photon absorption properties of organic chromophores using the time-dependent density functional theory. J. Phys. Chem. B 108(3): 899-907, 2004
  2. Masunov A. When density functional theory goes wrong and how to fix it: spin balanced unrestricted Kohn-Sham formalism. arXiv.org/abs/physics/0310106, 2003
  3. Masunov A, Lazaridis T. Potentials of mean force between ionizable amino acid side chains in water. J. Am. Chem. Soc. 125(7): 1722-30, 2003
  4. Dannenberg JJ. Haskamp L. Masunov A. Are hydrogen bonds covalent or electrostatic? A molecular orbital comparison of molecules in electric fields and H-bonding environments. J. Phys. Chem. 103(35): 7083-7086, 1999
  5. Vyboishchikov S.F., Masunov A.E., Streltsov V.A., Zorkii P.M., Tsirelson V.G. Topological analysis of electron density in a chlorine crystals. Russ. J. Phys. Chem. 68(11): 1837-1840, 1994
  6. Masunov A.E., Gladkikh O.P., Zorkii P.M. Structure-relaxation mechanism of electrical conductivity of crystals. Russ. J. Phys. Chem. 67(7): 1275-1277, 1993
  7. Masunov A.E. Stereoelectronic model of the structure of layered crystals of binary dihalides. Russ. J. Coord. Chem. 19(4): 242-249, 1993
  8. Zorky P.M., Masunov A.E. X-ray diffraction studies on electron density in organic crystals. Russian Chemical Reviews. 59(7):529-606, 1990