Tetrabutylammonium perchlorate Chemical Properties Melting point 211-215 °C density 1.0387 (rough estimate) refractive index 1.6800 (estimate) solubility acetonitrile: 0.1 g/mL, clear, colorless form Crystalline Powder color White Water Solubility Soluble in acetonitrile and ethanol. Very slightly soluble in water.