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Their photophysical and binding properties for magnesium, calcium and zinc ions have been assessed using absorption, emission and excitation spectroscopy. Each compound has a p<jats:italic>K<\/jats:italic><jats:sub>a<\/jats:sub> value between 6.2 and 5.1 and exhibits no significant pH response around pH\u20057.2. Enhanced selectivity for Mg<jats:sup>2+<\/jats:sup> over Ca<jats:sup>2+<\/jats:sup> was observed with a pentadentate phosphinate substituted system, compared to its carboxylate analogue, due to a 10\u2010fold lowering of affinity for the Ca<jats:sup>2+<\/jats:sup> ion. In each case, the overall dissociation constants for Mg<jats:sup>2+<\/jats:sup> fall in the low m<jats:sc>m<\/jats:sc> range.<\/jats:p>","DOI":"10.1002\/chem.201800013","type":"journal-article","created":{"date-parts":[[2018,2,28]],"date-time":"2018-02-28T06:13:30Z","timestamp":1519798410000},"page":"6432-6441","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Tuning Mg(II) Selectivity: Comparative Analysis of the Photophysical Properties of Four Fluorescent Probes with an Alkynyl\u2010Naphthalene Fluorophore"],"prefix":"10.1002","volume":"24","author":[{"given":"Edward R. H.","family":"Walter","sequence":"first","affiliation":[{"name":"Department of Chemistry Durham University  South Road Durham DH1 3LE UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4688-3000","authenticated-orcid":false,"given":"J. A. 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