Dynamics of the hydrogen-bonding arrangement in solid triphenylmethanol: an investigation by solid-state 2H NMR spectroscopy

Article Abstract:

The dynamic characteristics of the hydrogen-bonding configuration in triphenylmethanol (Ph3COD) were investigated using solid-state 2H NMR spectroscopy. The configuration is dynamic because the 2H NMR structure for PhCOD varies depending on the temperature range of 97-373K. One model provides a satisfactory explanation to the 2H NMR spectra in the temperature range. The model postulates that the deuteron of the apical molecule rotates with a three-site 120 degree jump while the basal molecules experience a two-site 120 degree jump. The activation energies of the apical deuterons were measured as 10kJ mol-1 while the basal was kJ mol-1.

Research, Hydrogen bonding, Hydrogen bonds, Molecular association

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Interaction of urea with pluronic block copolymers by [super 1]H NMR spectroscopy

Article Abstract:

The interactions of urea with poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide (PEO-PPO-PEO) triblock copolymers are characterized by using solution [super 1]H NMR techniques. It was seen that the urea was established to interact selectively with the PEO blocks of the block copolymer, and the interaction sites were found not to change with the increasing temperature.

Nitrogenous Fertilizer Manufacturing, Nitrogenous fertilizers, Urea, Usage, Nuclear magnetic resonance spectroscopy, Block copolymers, Chemical properties, Report

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