CLATHRATESCOMPOUNDS OF NOBLE GASES

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These  gas form a number of compounds In which the gases are Trapped With In Cavities Of Crystral lattices of certain organic and Inorganic Substance .SuchCompounds Are Called Clathrates or cage compounds .when o-dihydroxy beta quinol is allowed to crystallise from its solution in water in presence of heavier noble gases [Ar,Kr,Xe]under a pressure of !0 -40 atmosphres , the atoms of noble gases get entrapped  with in the lottice of quinol crystals .Thus ,crystals are quite stable .But on heating ,the gas escapes and quinol remain behind such .                                                                                                                                  When water is allowed to freeze in presence of argon ,Kr or Xe under pressure ,the atoms of noble gases get trapped in the crystal structure of giving clathratee with composition 5.75 molecules of water for 1 molecule of noble gas .                                                                                                                             from X - ray examination ,it is found that a crystal of  beta quinol is a three dimenstional network containing several cavities of 4 Amstang diameter bound together  by H -Bonds .    When Beta quinol is allowed to crystallise  from its solution in presence of noble gas , caluculate Compound result . The trapped Molecules do not escape .Small molecules of He ,ne do escape and this is the reason that they do not   form clathrates compound in quinol .in a clathrate compound ,the crystal structure with cavities such as betya quinol is called host while the atom  entropped in it is guest .                                                                                                                                                          Use of Clathrates Noble gases .   seperation of helium and Neon from a mixture  of noble gases can be done by crystaling Beta quinol in presence of mixture of noble gases .Ar, Xe, Kr get entrapped in the cavities .Kr 85  Clathrate provides a safe sourace of beta radiation whereas xe 133 Clatherate is source of gama radiation                                

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