“…Route A: general nucleophilic substitution synthetic routes of Li 2 (BPy-bdc) First, we tried to prepare Li 2 (BPy-bdc) using the reported general procedure (route A) as follows: DHTPA (4.0 g, 20 mmol, ≥98%, Aladdin) and potassium carbonate (K 2 CO 3 ) (12.6 g, 91 mmol, Aladdin) were dispersed in 160 mL of N , N -dimethylformamide (DMF) under stirring, to which propargyl bromide (5.2 g, 44 mmol, Aladdin) was added drop by drop.…”