The comparison of the bonding property between S_4~2+ , Se_4~2+, Tel_4~2+ , Bi_4~2+ with the plane square geometry and the butterfly geometry was performed.

• 讨论了平面正四边形S_4~(2+)、Se_4~(2+)、Te_4~(2+)和Bi_4~(2-)簇离子与蝴蝶形四核原子簇在成键性质上的不同。