Synthesis, crystal structure, spectroscopic studies and Ab-initio calculations on third-order optical nonlinearity of a five-coordinate chloroiron(III) complex

A five-coordinate chloroiron(III) complex has been synthesized and characterized by X-ray diffraction analysis and UV-Vis spectroscopy. The maximum one-photon absorption ( OPA) wavelengths recorded by both linear optical measurements and quantum mechanical computations using the configuration interaction ( CI) method are estimated to be shorter than 400 nm in the UV region, showing good optical transparency to visible light. To investigate the microscopic third-order nonlinear optical ( NLO) behavior of the title compound, we have computed both dispersion-free ( static) and also frequency-dependent( dynamic) linear polarizabilities (alpha) and second hyperpolarizabilities (gamma) at lambda = 825 - 1125 nm and 1050 - 1600 nm wavelength areas using the time- dependent Hartree - Fock ( TDHF) method. The ab- initio calculation results with non- zero values on ( hyper) polarizabilities indicate that the synthesized molecule might possess microscopic third- order NLO phenomena.