SEARCH Articles Figures Tables 18-Crown-6 complexes Alkali and alkaline-earth metal complexes with inverse crown structures Alkali metals crown-ether complexes Alkaline earth metal complexes crown ethers Benzo-5-crown alkali metal complexes Complexation crown-metal Complexation, crown Crown ethers complexes with alkali metals Crown ethers complexes with alkaline earth metals Crown ethers metal cation complexes Crown ethers metal complexes Dibenzo-18-crown alkali metal complexes Donor transition metal-crown ether complexes Metal complexes of crown ethers