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Source of materialAmixture of 4-acetamidobenzoic acid (0.072 g, 0.4 mmol), copper chloride (0.034 g, 0.2 mmol) and 2,2'-bipyridine (2,2'-bipy, 0.031 g, 0.2 mmol) was dissolved in 15 ml of 95 %ethanol. The pH value of the resultant mixture was adjusted to about 6.5 by adding three drops of triethylamine solution and the reaction was kept under water-bath condition at 343 Kfor 20 h. Afterwards, the system was filtrated, and the filtrate was cooled to room temperature slowly. Deep blue single crystals suitable for X-ray diffraction analysis were obtained after three weeks.

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