The purity of SnCl4 as monitored by 35Cl nuclear quadrupole resonance

The nuclear quadrupole resonance (NQR) spectroscopy was used to control the comparative purity of three SnCl4 samples subjected to successive stages of deep purification. The results showed that at 77 K the samples were identical in purity degree due to the 'freezing' of impurities into a separate fraction not affecting the perfection of the SnCl4 crystal lattice. The results of relaxation measurements suggest that paramagnetic impurity atoms (Fe and Cr) contained in the samples in small amounts might be embedded into the crystal lattice causing extremely long spin-spin relaxation time.

Automated summary

Nuclear quadrupole resonance (NQR) spectroscopy is used to control the comparative purity of SnCl4 samples during deep purification. The results show that at 77K, the samples have the same purity level, as impurities are frozen into a separate fraction without affecting the integrity of the crystal lattice. Additionally, relaxation measurements suggest that small amounts of paramagnetic impurity atoms (Fe and Cr) may be embedded into the crystal lattice, resulting in extremely long spin-spin relaxation time.