![]() Since this is an absorption technique the observer will precieve the complementary color that has not been absorbed. Compounds used in the laboratories Compound Solvents used in UV-Vis spectroscopy (near UV) SolventĬ. Π* transition corresponds to the excitation of an electron from one of the unshared pair to theġ. The " n" electrons (or the nonbonding electrons) are the ones located on the oxygen of the carbonyl group of tetraphenyclopentadienone. The UV-vis spectrum of tetraphenyclopentadienone is given below and should be similar to the one you obtained from lab. UV-Vis analysis of Tetraphenylcyclopentadienone Π to π* and n to π* transitions occur in the UV-vis region are observed. The σ to σ* transition requires an absorption of a photon with a wavelength which does not fall in the UV-vis range (see table 2 below). The following electronic transitions are possible:Īnd are shown in the below hypothetical energy diagram The ultraviolet region falls in the range between 190-380 nm, the visible region fall between 380-750 nm. Ultraviolet and visible radiation interacts with matter which causes electronic transitions (promotion of electrons from the ground state to a high energy state).
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