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Thallous hypophosphate, Tl4P2O6

Thallous hypophosphate, Tl4P2O6, from thallous carbonate and hypo-phosphoric acid, is a sparingly soluble salt, which turns blue when exposed to light, and decomposes at 250° into thallium and thallium metaphosphate.

The acid hypophosphate, Tl2H2P2O6, prepared from the acid barium salt and thallous sulphate, forms monoclinic crystals, slightly soluble in cold, more readily in hot water. It melts at 200° and evolves phosphine at higher temperatures.

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