Solid state crystal structures have been determined for many complexes of alkali metal ions in small peptides, nucleic acid constituents, carbohydrates and ionophore complexes.
sˈɑːlɪd stˈeɪt kɹˈɪstəl stɹˈʌktʃɚz hɐvbɪn dɪtˈɜːmɪnd fɔːɹ mˈɛni kˈɑːmplɛksᵻz ʌv ˈælkəlˌaɪ mˈɛɾəl ˈaɪɑːnz ɪn smˈɔːl pˈɛptaɪdz, nuːklˈɪɪk ˈæsɪd kənstˈɪtʃuːənts, kˌɑːɹboʊhˈaɪdɹeɪts ænd ˈaɪənˌɑːfoːɹ kˈɑːmplɛksᵻz.