The absorption of light by a molecule, which can provide information about its electronic structure.
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{5-Chloro-1-methyl-3,4-bis-[(E)-phenyliminomethyl]-1H-pyrrol-2-yl}-phenyl-amine
(N,N-dipropyldithiocarbamato)(isothiocyanato)(triphenylphosphine)nickel(II)
2-mesityl-2-(phenylethynyl)-1,1,1,3,3,3-hexamethyltrisilane