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Porphyrin molecules on large band\u2010gap semiconducting metal oxides represent key materials for many different optical and electronic applications. Herein, we have proposed a general two\u2010step procedure for the functionalization of metal\u2010oxide crystals with dye\u2010sensitizers. In particular, we functionalized SnO<jats:sub>2<\/jats:sub> nanoparticles with a monolayer of the bifunctional trichloro[4\u2010(chloromethyl)phenyl]silane. Then, a monolayer of 5,10,15,20\u2010tetrakis(4\u2010hydroxyphenyl)\u201021H,23H\u2010porphyne was covalently bound to the silanized SnO<jats:sub>2<\/jats:sub> grains. IR, UV\/Vis, and luminescence measurements were used for optical characterization. The measured footprint of the grafted porphyrin molecules indicated total surface coverage of the grains. The surface electronic characterization was performed by using X\u2010ray photoelectron spectroscopy. Emission measurements revealed two strong bands at 664.1 and 721.0\u2005nm that were attributed to the porphyrin monolayer assembled on the surface of the SnO<jats:sub>2<\/jats:sub> crystals.<\/jats:p>","DOI":"10.1002\/cssc.201300149","type":"journal-article","created":{"date-parts":[[2013,4,22]],"date-time":"2013-04-22T16:18:02Z","timestamp":1366647482000},"page":"1031-1036","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Functionalization of SnO<sub>2<\/sub> Crystals with a Covalently\u2010Assembled Porphyrin Monolayer"],"prefix":"10.1002","volume":"6","author":[{"given":"Domenico 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