▎ 摘　　要

A class of 2D structures based on the architecture of the so called octa-graphene is proposed and theoretically investigated for the first time. The building blocks used to construct these structures are butadienes and linear carbon chains, with alternate single and triple bonds. The density functional theory (DFT) with periodic conditions is applied to study the electronic, structural, elastic and vibrational properties. These structures are stable and have interesting mechanical properties, as a large stiffness described by a 2D Young modulus varying within the range 116.00(N /m)