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This phenomenon is studied by exploring binary YX<jats:sub>2<\/jats:sub>\u22c5\u22c5\u22c5<jats:italic>N<\/jats:italic>\u2010Base complexes and two types of ternary MCl<jats:sub>2<\/jats:sub>\u22c5\u22c5\u22c5YX<jats:sub>2<\/jats:sub>\u22c5\u22c5\u22c5<jats:italic>N<\/jats:italic>\u2010Base, YX<jats:sub>2<\/jats:sub>\u22c5\u22c5\u22c5<jats:italic>N<\/jats:italic>\u2010Base\u22c5\u22c5\u22c5MCl<jats:sub>2<\/jats:sub> complexes, in which YX<jats:sub>2<\/jats:sub> is a chalcogen compound (Y=S, Se; X=F, Cl), the <jats:italic>N<\/jats:italic>\u2010Bases are <jats:italic>sp<\/jats:italic>, <jats:italic>sp<\/jats:italic><jats:sup>2<\/jats:sup>, and <jats:italic>sp<\/jats:italic><jats:sup>3<\/jats:sup> bases (NCH, HN=CH<jats:sub>2<\/jats:sub>, NH<jats:sub>3<\/jats:sub>), and MCl<jats:sub>2<\/jats:sub> are alkaline\u2010earth BeCl<jats:sub>2<\/jats:sub> or MgCl<jats:sub>2<\/jats:sub> derivatives. Starting from the chalcogen\u2010bonded complexes YX<jats:sub>2<\/jats:sub>\u22c5\u22c5\u22c5NH<jats:sub>3<\/jats:sub> and YX<jats:sub>2<\/jats:sub>\u22c5\u22c5\u22c5HN=CH<jats:sub>2<\/jats:sub>, the binding site of a new incoming alkaline\u2010earth bond is found, surprisingly, to depend on the nature of the halogen atom attached to the chalcogen. For the YF<jats:sub>2<\/jats:sub> binary complexes the association site is the F atom of the YF<jats:sub>2<\/jats:sub> subunit, whereas for YCl<jats:sub>2<\/jats:sub> it is the N atom of the nitrogen base. Regarding YX<jats:sub>2<\/jats:sub>\u22c5\u22c5\u22c5NCH complexes, N is the most favorable site for an alkaline\u2010earth interaction in ternary complexes, regardless of which YX<jats:sub>2<\/jats:sub> derivative is used. The explanation relies on the interplay of all the noncovalent interactions involved: the strong cooperativity between chalcogen and alkaline\u2010earth bonds, and the appearance of secondary noncovalent interactions in the form of hydrogen bonds.<\/jats:p>","DOI":"10.1002\/chem.201901641","type":"journal-article","created":{"date-parts":[[2019,6,3]],"date-time":"2019-06-03T07:55:33Z","timestamp":1559548533000},"page":"11688-11695","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Ternary Complexes Stabilized by Chalcogen and Alkaline\u2010Earth Bonds: Crucial Role of Cooperativity and Secondary Noncovalent Interactions"],"prefix":"10.1002","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2596-5987","authenticated-orcid":false,"given":"Otilia","family":"M\u00f3","sequence":"first","affiliation":[{"name":"Departamento de Qu\u00edmica, M\u00f3dulo 13 Facultad de Ciencias and Institute of, Advanced Chemical Sciences (IadChem) Universidad Aut\u00f3noma de Madrid  Campus de Excelencia UAM-CSIC Cantoblanco 28049 Madrid Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9499-0900","authenticated-orcid":false,"given":"M. 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