Absorption organic molecules from aqueous

Absorption of Organic Molecules from Aqueous Solutions... 

Acrolein is a small organic molecule with some very interesting features. It can be considered as a prototype of molecular systems containing two conjugated chromo-phores, namely C=C and C=0, a common feature for many natural molecules. Also, the presence of two characteristic functional groups at the same time has important consequences in the chemistry and photochemistry of acrolein. For these reasons, its UV absorption spectrum has been extensively studied in different solvents [104—110] as well as in the gas phase [111-113], and a solvatochromic blue shift of the n —> n transition of the C=0 group has been observed in going from the gas phase to aqueous... 

A reevaluation of molecular structure of humic substances based on data obtained primarily from nuclear magnetic resonance spectroscopy, X-ray absorption near-edge structure spectroscopy, electrospray ionization-mass spectrometry, and pyrolysis studies was presented by Sutton and Sposito (2005). The authors consider that humic substances are collections of diverse, relatively low molecular mass components forming dynamic associations stabilized by hydrophobic interactions and hydrogen bonds. These associations are capable of organizing into micellar structures in suitable aqueous environments. Humic components display contrasting molecular motional behavior and may be spatially segregated on a scale of nanometers. Within this new structural context, these components comprise any molecules... 

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