Faculty Research
Alphabetical · By research area

Our research is focused on the development and applications of methods for accurate computational studies of electronic structure, geometry, vibrational spectra, reaction mechanisms, and one-electron properties of organometallic molecules, molecular ions, and molecular clusters in their ground and excited electronic states. We are interested in both small and lage molecules. For small systems we are using all-electron techniques; for larger molecular systems we use pseudopotential methods. In our work we study systems of very different sizes, from atoms to proteins.

We are specifically interested in:

• Development, calibration, and applications of pseudopotential methods required to deal with large molecules or molecular systems containing heavy atoms; our model core potentials allow for the description of the scalar relativistic effects.
• Development and applications of methods to calculate both 1- and 2-electron spin-orbit effects.
• Development of basis sets for all-electron relativistic calculations on molecules containing very heavy, trans-uranium atoms.
• Studies of molecular structure and properties of very large molecules and molecular clusters using both non-relativistic and scalar-relativistic model core potential representation of the core electrons and correlated wavefunctions or density functionals for the description of the valence electrons. We are particularly interested in the interactions of such systems with metal ions.
• Studies of weakly bonded systems containing noble gas atoms in ground end excited electronic states.
• Studies of novel compounds that contain noble-gas elements. After investigations of molecules with Xe-C bond, we are currently modeling systems that contain xenon and transition metal atoms.
• Modeling of novel anti-cancer drugs. In this case, in order to be able to represent both the drug molecule as well as the target protein, we use the hybrid QM/MM approach, with the quantum mechanical treatment used for the drug molecule, and molecular mechanics used to model protein.

Contour diagrams of occupied frontier molecular orbitals of Au⁺Xe, with the maximum contour value 1.0 a.u. and maximum number of contours 100. Red indicates positive sign of the orbitals and blue - negative. [J. Phys. Chem. A, 112 (2008) 5236-5242].

Differences in the binding energies of sixteen derivatives of colchicine (1-16) and ten isoforms of α/β tubulin dimer (I - VIII). Negative values indicate that the derivative binds to tubulin more strongly than colchicine. [J. Chem. Inf. Model. 48 (2008) 1824-1832.]

Selected Publications

J. Y. Mane, M. Klobukowski, J. T. Huzil, and J. Tuszynski "Free energy calculations on the binding of colchicine and its derivatives with the α/β -tubulin isoforms" J. Chem. Inf. Model. 48 (2008) 1824-1832.

T. Zeng and M. Klobukowski, "Relativistic Model Core Potential Study of the Au⁺Xe System" J. Phys. Chem. A, 112 (2008) 5236-5242.

M. Gajewski, J. Tuszynski, H. Mori, E. Miyoshi, and M. Klobukowski, "DFT studies of the electronic structure and geometry of 18-crown-6, hexaaza[18]annulene, and their complexes with cations of the heavier alkali and alkaline earth metals" Inorg. Chim. Acta, 361 (2008) 2166-2171.

Y. Osanai, M.S. Mon, T. Noro, H. Mori, H. Nakashima, M. Klobukowski, and E. Miyoshi, "Revised model core potentials for first-row transition-metal atoms from Sc to Zn" Chem. Phys. Lett., 452 (2008) 210-214.

T. Zeng, Z. Jamshidi, H. Mori, E. Miyoshi, and M. Klobukowski, "Electron affinities of heavier phosphoryl and thiophosphoryl halides APX₃ (A = O, S and X = Br, I)" J. Comput. Chem., 28 (2007) 2027-2033.

E. Miyoshi, H. Mori, R. Hirayama, Y. Osanai, T. Noro, H. Honda, and M. Klobukowski "Compact and Efficient Basis Sets of s- and p-block Elements for for Model Core Potential Method" J. Chem. Phys., 122 (2005) 074104-1-074104-8.

C.C. Lovallo and M. Klobukowski, "Improved Model Core Potentials for the Second- and Third-Row Transition Metals" J. Comput. Chem., 25 (2004) 1206-1213.

J. Mane and M. Klobukowski, "The well-tempered model core potentials for the main group elements Li through Rn" Theoret. Chem. Accounts, 112 (2004) 33-39.

C.C. Lovallo and M. Klobukowski, "Accurate ab initio pair potentials between helium and the heavier Group 2 elements" J. Chem. Phys., 120 (2004) 246-252.