Desorption kinetics of a xanthenol-dioxane clathrate.

Spectroscopic identification, thermodynamic stability and molecular composition of hydrogen and 1,4-dioxane binary clathrate hydrate

We present the spectroscopic identification of the binary hydrogen and 1,4-dioxane clathrate hydrates in which H2 molecules are encapsulated in small cages of the structure II hydrate framework. X-ray diffraction, solid-state NMR and Raman spectroscopy were used to confirm the mixed hydrate structure and more importantly the occupancy pattern of hydrogen in clathrate cages. The corresponding pr...

New Pyridylene-bridged Bisoxazoles – Synthesis and Structural Study

The bisoxazoles 1a – 1c that feature structures with two oxazole moieties connected to a 2,6pyridylene central linker and contain different aryl substituents in 4and 5-positions of the oxazole rings have been synthesized. Single-crystal X-ray structure determinations of the free ligand 1a, containing the NiCl2 complex of 1c as the CH3COOH solvate as well as the 1,4-dioxane-solvated diester inte...

A Clathrate Uncertainty Principle

The crystal engineering design of new clathrate hosts that employ intermolecular attractive forces much weaker than hydrogen bonding and coordination complexation remains problematic. One approach has been to prepare a series of V-shaped molecules with C2symmetry, a small degree of conformational freedom, and protruding halogen atoms. This design has been highly successful (95%), but little pre...

Desorption Kinetics of Heavy Metals (Lead, Zinc, and Nickel) Coexisted with Phenanthrene from a Natural High Buffering Soil

This work aims to investigate the competitive time-dependent desorption rate of heavy metals (lead, zinc, nickel) coexisting with phenanthrene from natural high buffering soil. Two non-ionic surfactants (Tween 80 and Brij 35) combined with disodium ethylene diamine tetraacetate salt (Na2-EDTA) were utilized as the reagents. The contaminants’ time-dependent desorption data was fitted with five k...

Rapid Analysis of 1,4-Dioxane in Groundwater by Frozen Micro-Extraction with Gas Chromatography/Mass Spectrometry