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Although many works have been reported to efficiently detect mercury, development of simple and convenient sensors is still longed for quick analyzing mercury in water. In this work, a nanoscale metal-oxo cluster, (<jats:italic>n<\/jats:italic>-Bu<jats:sub>4<\/jats:sub>N)<jats:sub>2<\/jats:sub>[Mo<jats:sub>5<\/jats:sub>NaO<jats:sub>13<\/jats:sub>(OCH<jats:sub>3<\/jats:sub>)<jats:sub>4<\/jats:sub>(NO)], (MLPOM), organically-derivatized from monolacunary Lindqvist-type polyoxomolybdate, is found to specifically react with Hg<jats:sup>2+<\/jats:sup> in methanol\/water via structural transformation. The MLPOM methanol solution displays a color change from purple to brown within seconds after being mixed with an aqueous solution containing Hg<jats:sup>2+<\/jats:sup>. By comparing the structure of polyoxomolybdate before and after reaction, the color change is revealed to be the essentially structural transformation of MLPOM accelerated by Hg<jats:sup>2+<\/jats:sup>. Based on this discovery, MLPOM could be utilized as a colorimetric sensor to sense the existence of Hg<jats:sup>2+<\/jats:sup> and a simple and label-free method is developed to selectively detect aqueous Hg<jats:sup>2+<\/jats:sup>. Furthermore, the colorimetric sensor has been applied to indicating mercury contamination in industrial sewage.<\/jats:p>","DOI":"10.1038\/srep16316","type":"journal-article","created":{"date-parts":[[2015,11,12]],"date-time":"2015-11-12T11:53:33Z","timestamp":1447329213000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":40,"title":["Label-free colorimetric detection of mercury via Hg2+ ions-accelerated structural transformation of nanoscale metal-oxo clusters"],"prefix":"10.1038","volume":"5","author":[{"given":"Kun","family":"Chen","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shan","family":"She","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiangwei","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aruuhan","family":"Bayaguud","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yongge","family":"Wei","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2015,11,12]]},"reference":[{"key":"BFsrep16316_CR1","doi-asserted-by":"publisher","first-page":"2167","DOI":"10.1016\/S0140-6736(06)69665-7","volume":"368","author":"P Grandjean","year":"2006","unstructured":"Grandjean, P. & Landrigan, P. 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