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For all of the studied porphyrin derivatives the most significant spectral changes were observed upon addition of Zn\n                    <jats:sup>2+<\/jats:sup>\n                    , Cd\n                    <jats:sup>2+<\/jats:sup>\n                    , Cu\n                    <jats:sup>2+<\/jats:sup>\n                    , Co\n                    <jats:sup>2+<\/jats:sup>\n                    , Pb\n                    <jats:sup>2+<\/jats:sup>\n                    , Hg\n                    <jats:sup>2+<\/jats:sup>\n                    , and Fe\n                    <jats:sup>3+<\/jats:sup>\n                    , which resulted in a color change from red to green. When the remaining metal ions were tested, no significant changes were observed. The results reveal, as expected, the formation of mononuclear complexes for porphyrin\n                    <jats:bold>4<\/jats:bold>\n                    , dinuclear complexes for diporphyrin\n                    <jats:bold>7<\/jats:bold>\n                    , and trinuclear complexes for triporphyrins\n                    <jats:bold>9<\/jats:bold>\n                    and\n                    <jats:bold>10<\/jats:bold>\n                    . In addition, complexes of type M\n                    <jats:sub>6<\/jats:sub>\n                    L were determined for hexaporphyrin\n                    <jats:bold>8<\/jats:bold>\n                    . The NMR spectroscopy studies suggest that the interaction with the metals occurs with the formation of sitting\u2010atop complexes. This study also shows that the sensitivity increases with increasing number of coordination sites, with the most pronounced case observed for Hg\n                    <jats:sup>2+<\/jats:sup>\n                    . The lowest value of detectable concentration of 0.05\u2005\u03bc\n                    <jats:sc>m<\/jats:sc>\n                    for Hg\n                    <jats:sup>2+<\/jats:sup>\n                    was achieved for hexaporphyrin\n                    <jats:bold>8<\/jats:bold>\n                    .\n                  <\/jats:p>","DOI":"10.1002\/cplu.201500386","type":"journal-article","created":{"date-parts":[[2015,10,23]],"date-time":"2015-10-23T04:25:05Z","timestamp":1445574305000},"page":"143-153","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Study of Multiporphyrin Compounds as Colorimetric Sitting\u2010Atop Metal Complexes: Synthesis and Photophysical Studies"],"prefix":"10.1002","volume":"81","author":[{"given":"Joana I. T.","family":"Costa","sequence":"first","affiliation":[{"name":"Department of Chemistry &amp; QOPNA University of Aveiro  3810-193 Aveiro Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8339-4820","authenticated-orcid":false,"given":"Elisabete","family":"Oliveira","sequence":"additional","affiliation":[{"name":"BIOSCOPE group UCIBIO-REQUIMTE Chemistry Department Faculty of Sciences and Technology University NOVA of Lisbon  2829-516 Caparica Portugal"},{"name":"Proteomass Scientific Society Madan Parque  Rua dos Inventores 2825-182 Caparica Portugal"},{"name":"Veterinary Science Department and CECAV University of Tr\u00e1s-os-Montes and Alto Douro  5001-801 Vila Real Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hugo M.","family":"Santos","sequence":"additional","affiliation":[{"name":"BIOSCOPE group UCIBIO-REQUIMTE Chemistry Department Faculty of Sciences and Technology University NOVA of Lisbon  2829-516 Caparica Portugal"},{"name":"Proteomass Scientific Society Madan Parque  Rua dos Inventores 2825-182 Caparica Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4331-714X","authenticated-orcid":false,"given":"Augusto C.","family":"Tom\u00e9","sequence":"additional","affiliation":[{"name":"Department of Chemistry &amp; QOPNA University of Aveiro  3810-193 Aveiro Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7953-8166","authenticated-orcid":false,"given":"Maria G. 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