On the Halogen Nuclear Magnetic Resonance of Some Metal Halides I

Chemical shifts of chlorine, bromine and iodine nuclear magnetic resonance of some metal halides were measured. The results indicates that the origin of the large shift is the second-order paramagnetism due to the halogen atom covalently bonnded to the neighbouring metal atoms in the crystal. The degree of covalency estimated from the shift has a reasonable order of magnitude. Spin-lattice relaxation times of LiBr, AgBr and TlBr were also measured and it was revealed that they have direct correlation to the shift. From this we concluded that the mechanism of T 1 of these crystals is the quadrupole coupling caused by the covalent bonding of the bromine atom.