1. Introduction Owing to remarkable physicochemical properties and biological activities, azulene and its derivatives have attracted the particular attention of many theoretical and ex- perimental researchers for more than two hundred years [1–4]. Numerous interesting chromophores, particularly colorful ...
As reported by Nguyen and Ha from theoretical and spectroscopic studies, CO2 can interact with water vapour [76]; oxygen lone pairs in H2O can interact with anti-bonding 2πu at central carbon atoms in CO2, leading to the formation of van der Waals complexes [77]. Despite the great ...