ABSTRACT
Chlorine is a very reactive element, and it reacts with almost all other elements in order to complete its outer shell and thus is never found free in nature. It is generally found as a yellow-green gas Cl2 at room temperature, but its most common compound is the common salt sodium chloride. Chlorine-containing organic molecules such as Chlorofluorocarbons (CFCs) are also used in many applications due to their low toxicity, reactivity, and flammability, as well as in blowing agents and propellants for medication. However, CFCs have been implicated in ozone depletion in the upper atmosphere, and their manufacture has been phased out to be replaced by hydrofluorocarbons. Combinations of nuclear magnetic resonance spectroscopy experiments have also been used over the years to study ion binding in liquid crystals and in erythrocyte anion transport proteins or other biological systems, to measure quadrupolar coupling in chloride compounds, or to provide new insights in the structure of layered double hydroxide material.
