SEARCH Articles Figures Tables 18-Crown metal complexes 18-Crown structure 18-Crown-6 complexes Alkali Alkaline Alkali and alkaline earth metals Alkali complex Alkali complexation Alkali complexes with Alkali metal complexes with Alkali metals complexes Alkali metals metal complexes with Alkali, alkalinity Alkali-earth metals Alkaline complexes Alkaline earth metals Alkaline earth metals complexes Alkaline metals structure And alkalinity And inversion Complexation, crown Inverse crown structures Inverse crowns Inversion, structure and Metal alkaline Metal complex structure Metal complexes inversion Metallic complexes structure Metals, alkali alkaline-earth Structural inversion Structures and Complexes