A novel route to synthesize diphenylene by the catalytic effect of GaP nanocrystals

Diphenylene was synthesized directly from benzene under the catalytic effect of GaP nanocrystals, and the effect of GaP nanocrystals content was studied. The experimental results showed that no reactions took place without GaP nanocrystals. The more the GaP nanocrystals added, the more the reaction complete. Furthermore, at high temperatures (450-480℃), when the content of GaP nanocrystals was high enough, almost all benzene polymerized and the yield of diphenylene was rather high. On the contrast, even if there are enough GaP nanocrystals in the reaction mixture, almost no polymerization reaction took place at low temperature (for example, 250-300℃), and the yield of diphenylene was very poor. The analytical results of XRD, IR, elemental analysis and NMR proved that the sample was truly diphenylene.     

利用纳米晶的催化性质合成二联苯

利用GaP纳米晶的表面催化作用, 从苯直接合成了二联苯, 并研究了合成反应过程中GaP纳米晶含量的影响. 结果表明：在没有GaP纳米晶时, 直到480℃也没有观察到苯的明显聚合; 而当有GaP纳米晶存在时, 参与聚合反应的苯的数量与GaP纳米晶的含量成正比, 在足够高的GaP纳米晶含量情况下, 高温(450~480℃)时苯几乎完全发生聚合, 而且二联苯的相对产率较高; 与之相反, 在低温条件(250~300℃)下, 即使有足够的GaP纳米晶存在, 苯也只有少量发生聚合, 二联苯的相对产率迅速降低. 对样品所做的红外、核磁共振、以及元素分析证实了样品是二联苯.