For the first time, we reported the preparation of the oligomer of carbon dioxide. The oligomerization of carbon dioxide was carried out with the aid of the synergetic catalysis of 1,8-diazabicyclo(5, 4, 0)undec-7-ene (DBU) and quaternary salt of water-soluble chitosan (QWSC), which was conducted at 75 °C for 24 h by using petroleum ether as dispersing medium. The product was separated and purified through repeated dissolution-precipitation by using dichloromethane, petroleum ether and distilled water as solvents and precipitant respectively. Fourier transform infrared spectroscopy (FTIR), fluorescence spectroscopy, carbon nuclear magnetic resonance (¹³CNMR), and MALDI-TOF spectrometry (MS) was applied to characterize the product. The results confirmed that the obtained product was the expected oligomer of CO₂, linear H-(O-CO)₁₇-H and cyclic (O-CO)₁₃ containing DBU-like group.

我们首次报道了二氧化碳低聚物的制备。二氧化碳的低聚是借助1,8-二氮杂双环（5，4，0）十一碳-7-烯（DBU）和水溶性壳聚糖季盐（QWSC）的协同催化进行的使用石油醚作为分散介质，在75°C下进行24小时。分别通过使用二氯甲烷，石油醚和蒸馏水作为溶剂和沉淀剂的反复溶解沉淀来分离和纯化产物。应用傅里叶变换红外光谱（FTIR），荧光光谱，碳核磁共振（¹³ CNMR）和MALDI-TOF光谱（MS）表征产品。结果证实，所得产物是CO的预期低聚物。_{如图2所示}，含有DBU样基团的直链状H-（O-CO）₁₇ -H和环状（O-CO）₁₃。