Cocrystallization with Acetylene: Molecular Complex with Methanol

Methanol forms a cocrystal with acetylene, of which single crystals were grown in situ. The methanol chains of the β-methanol are retained, and acetylene is intercalated between the layers. The weight ratio of host to guest is 1.23, the lowest and most efficient value for all known acetylene cocrystals. Further, the first single crystal structure for the low-temperature α-form of methanol is reported confirming previous neutron powder data. For the β-form of methanol, the space group Cmc21 is favored in contrast to former data in Cmcm.

甲醇与乙炔可形成共晶体（cocrystal），研究人员通过原位（in situ）生长法制备了该共晶体的单晶。β相甲醇的分子链结构得以完整保留，乙炔分子被插层于各层之间。该共晶体的主体-客体重量比为1.23，为所有已知乙炔基共晶体中最低且最具效率的比值。此外，本研究首次报道了低温α相甲醇的单晶结构，证实了此前中子粉末数据的相关结论。针对β相甲醇，本次研究认定其空间群（space group）为Cmc2₁，这与此前基于Cmcm空间群的研究结果相悖。