Journal of Chemical Physics, Vol.111, No.2, 481-491, 1999
Solvent electronic polarization effect on the electronic transitions in solution: Charge polarizable reference interaction site model self-consistent field approach
Effect of the electronic polarization in solvent on the solvatochromic shift for the excitation energy of solute molecule is studied by the reference interaction site model self-consistent field (RISM-SCF) method. The electronic polarization in solvent molecule is represented by the charge response kernel (CRK) obtained by ab initio calculations. Employing the CRK, a charge polarizable RISM-SCF method is proposed for describing the electronic structure of solute molecules in solution and estimating the excitation energies. The excitation energy for n pi* transition of acetone is calculated in CH3CN, CHCl3, CCl4, and CS2 solvents and the solvent electronic polarization effect on the solvation shift is examined. As a result, a blue shifts of 1225, 675, 166, and 92 cm(-1) is obtained in those solvents. Furthermore, the solvation shifts in the transitions to the 1(1)B(1), 1(1)B(2), and 2(1)A(1) states of pyridine are evaluated in the same solvents. A blue shift is observed for the 1(1)B(1) <--1(1)A(1) transition in all the solvent, while the 2(1)A(1) <--1(1)A(1) one shows a red shift.