Abstract Multiple bond is a fundamental concept of chemical bond. The maximum number of chemical bond between main group elements in the periodic table is three. Stable double and triple bond between light main elements such as carbon, nitrogen and oxygen can be formed, while multiple bonds between heavy main elements is unstable due to Pauli repulsion. Afterward, scientists synthesized homoleptic and heteroleptic double bond compounds involving heavier p block elements. However, it is difficult to form triple bond between heavier p block elements because of their high reactivity. Recently, stable disilyne with silicon-silicon triple bond was synthesized, isolated and characterized. Quadruple, quintuple and sextuple bond were found by experimental and theoretical study on interactions between transition metals, because of d and f orbital involved in bond. Sextuple bond can be formed between two same actinide atoms.
