Investigation of surface interactions in molecular recognition of phosphonate imprinted organosilicates and the role of water.

Surface interactions in molecular recognition of phosphonate imprinted organosilicates and the role of water have been studied. NMR and calorimetry studies have shown the changing nature of the surface water structure on silicate surfaces due to template directed molecular imprinting. Results indicate the interaction of an organophosphonate compound with the functionalized silica surfaces to be through surrounding water molecules.

Organosilica copolymers for the adsorption and separation of multiple pollutants.

Benzene, diethylbenzene, and ethylenediamine-bridged bistrialkoxy precursors were used in the synthesis of multifunctional PMO copolymers for the adsorption of phenols and metal ions. Polyoxyethylene(10) stearyl ether (Brij 76) was used as the structure director with the surfactant template approach in the synthesis. The resulting PMO copolymers with two or more bridging groups have been characterized by nitrogen gas adsorption, powder X-ray diffraction, and 13C and 29Si solid-state NMR.

Examination of molecular interaction sites of acetanilides with organic matter surrogates using nuclear magnetic resonance techniques.

The dynamics of acetanilide pesticide interactions with organic matter (OM) surrogates were examined using nuclear magnetic resonance (NMR) spectroscopy. Differences in the relative changes in (13)C and (1)H spin-lattice relaxation times (T(1)) were measured at multiple molecular sites of metolachlor and the probe compound acetanilide to identify interaction sites and/or surfaces between the molecules and dissolved and colloidal OM surrogates. The decrease in T(1) at specific sites of acetanilide molecules was a function of the OM used and its concentration.