Ultrafast Third-Order Nonlinear Optical Response of Organic-Inorganic Hybrid Materials (C₁₉H₂₅N₂)₇H_nP₂Mo_18-nV_nO₆₂

We have measured the third-order optical nonlinearity of the organic-inorganic hybrid materials of supermolecules (C₁₉H₂₅N₂)₇H_nP₂Mo_18-nV_nO₆₂ (n =1, 2, 4, 5) and their reactants (C₁₉H₂₅N₂)Br and H_n+6P₂Mo_18-nV_nO₆₂ by using the ultrafast optical Kerr effect at 830 nm wavelength, with time resolution of 115 fs. By comparing the γ values of the supermolecules and their reactants, it is concluded that the charge-transfer enhanced remarkably the third-order optical nonlinearity of the compounds. With the increment of the number of the vanadium atoms, the electron distribution changed strongly and the γ value decreased dramatically.