A novel Brönsted–Lewis acidic heteropoly organic–inorganic salt: preparation and catalysis for rosin dimerization

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Table 1 Properties of hybrid catalysts

Samples	Feature	Melting point (°C)	Solubility (25 °C)		Acid strength (mV)	Total acid amount (mmol/g)
Samples	Feature	Melting point (°C)	Water	Toluene	Acid strength (mV)	Total acid amount (mmol/g)
Sm_0.33[TEAPS]₂PW₁₂O₄₀	White powder	>300	Almost not	Not	679	0.428
Sm_0.66[TEAPS]PW₁₂O₄₀	White powder	>300	Almost not	Not	676	0.148
[TEAPS]₃PW₁₂O₄₀	White powder	178	Almost not	Not	718	0.873
H₃PW₁₂O₄₀	Faint yellow/white crystal	95	Yes	Not	702	0.791