Solution and Solid-State Preparation of 18-Crown[6] Complexes with M[HSO4]n Salts (M = NH4+, K+, Sr2+ and n = 1, 2) and an Investigation of Solvation/Desolvation Processes and Crystal Polymorphism Breadcrumbs UL Home Research Publications Year of Publication 2007 Publisher WILEY-VCH VerlagWILEY-VCH Verlag Journal Chemistry â' A European Journal DOI 10.1002/chem.200601850