Multiple 3c2e bonding of methane with metal cations

► Ions of the elements from the IA and IIA groups form complexes with methane. ► Methane binding is stronger for the IIA ions and decreases with atomic number. ► Very strong complex is formed by methane with the beryllium ion. ► QTAIM analysis indicates the chemical bonding between carbon and metal. ► 3c2e bonds between metals and CH unit are crucial for complex formation.