Study of the Interhalogens

Because of the reactivity of the halogens and their ability to form a bonds between themselves, a number of inteihalogens of the formula XX (X is the more electronegative halogen and n is an odd number) are known. The general preparative method is by reacting the two halogens under specific conditions. 

The combination of chlorine and iodine in a 1 1 molar ratio produces ICl. 

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In a study of the interhalogen compounds de Jong et al 20 find that relativistic contributions increase the electric dipoles moment while the quadru-pole moment and the dipole polarizability vary irregularly. The relativistic contribution to the dipole and quadrupole moments of molecules containing I2 is between 10% and 20% of the whole and the contributions are not negligible in the other cases. 

A predissociation was observed, as can clearly be seen in Figure 11, which shows the laser excitation spectrum recorded at both low resolution ( 0.01 nm) and high resolution ( 0.001 nm). Onset of breaking-off in fluorescence in the 10—0 band is observed at J 12, indicating that predissociation of the B state commences at an energy of (22 700 15) cm above " = 0 of the ground state. (Predissociation has been observed in laser excitation studies of the interhalogens IF, BrF, and ICl, and it will be discussed for each in turn.)... 

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