Abstract
The /sup 73/Ge spin-lattice relaxation time (T/sub 1/) and spin-spin relaxation time (T/sub 2/) if such tetrahalogermanes as GeCl/sub 4/, GeBr/sub 4/, and GeI/sub 4/ have been measured as a function of temperature. It has been shown that the germanium nuclei in GeCl/sub 4/ and GeBr/sub 4/ relax solely via the quadrupole relaxation mechanism for T/sub 1/ and via a combination of the quadrupole and the scalar coupling relaxation mechanisms for T/sub 2/. On the other hand, both the spin-lattice and the spin-spin relaxations for germanium nuclei in GeI/sub 4/ were solely via the quadrupole relaxation mechanism at room temperature. The viscosities of tetrahalogermane solutions were measured to obtain the reorientational correlation time. The reorientational correlation times (tau/sub c/) of GeCl/sub 4/ and GeBr/sub 4/ were 0.78 x 10/sup -11/ and 1.8 x 10/sup -11/ s at 30/sup 0/C, respectively, and the activation energies 9.6 and 11.2 kJmol/sup -1/, respectively. The scalar coupling constant J(/sup 73/Ge-/sup 35/Cl), was calculated as 24 Hz by using T/sub 2/ of /sup 35/Cl in GeCl/sub 4/. 29 references, 4 figures, 6 tables.
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