UV-Visible absorption spectroscopy and Z-scan analysis along with corresponding molecular electronic structure analysis at DFT level for L-Tyrosine.

Abstract

Aqueous solutions of L-tyrosine prepared with a wide range of concentrations from 3.0 M to 1.5 mMwere examined by UV-Visible spectroscopy and Z-scan analysis along with quantum mechanical calculation for its molecular structure for possible cause of linear and nonlinear optical activities. L-tyrosine has been found to absorb light at three regions around 193 nm, 224 nm and 275 nm in aqueous solution. These absorptions exhibit 1La and1Lbtransitions in the side chain containing phenol ring structure. The aqueous solution of L-tyrosine also exhibits third order optical nonlinearity with negative refractive index of 3.1810-8 m2/W in the thermal regime as found by Z-scan technique. The HOMO-LUMO structure of L-tyrosine in solvated form calculated at DFT level using CAM-B3LYP parameters and aug-ccPVTZ /ccPVQZ basis sets give results consistent with observation of UV-Vis spectroscopy.