The starting materials are all commercially available and were used as purchased without further
purification. A typical procedure for the synthesis of CMF-1 was described as follows.
Cu(NO3)2·3H2O (1mmol), (NH4)2Mo7O24·4H2O (0.6mmol), and NH4B5O8 (1.36mmol) was
dissolved in 6ml deionized water. 0.5ml acetic acid and a certain amount of ammonia solution
were added to the mixture and adjusted the pH value to about 5. After stirring the solution for half
an hour, the mixture was sealed in 23ml Teflon-lined autoclaves, and heated at 180°C for 7 days.
After being cooled to the room temperature, black rectangle plate-shaped crystals were filtered,
washed with distilled water, and dried at room temperature overnight. Yield: 80% based on
(NH4)2Mo7O24·4H2O. Elemental analysis (wt%) found for CMF-1: C 0.38%, H 2.07%, N 5.31%;
calcd. C 0.00%; H 2.08%, N 5.31%.