title: Regulation of responsiveness of phosphorescence toward dissolved oxygen concentration by modulating polymer contents in organic-inorganic hybrid materials.
abstract: Platinum(II) octaethylporphyrin (PtOEP)-loaded organic-inorganic hybrids were obtained via the microwave-assisted sol-gel condensation with methyltrimethoxysilane and poly(vinylpyrrolidone). From transparent and homogeneous hybrid films, the strong phosphorescence from PtOEP was observed. Next, the resulting hybrids were immersed in the aqueous buffer, and the emission intensity was monitored by changing the dissolved oxygen level in the buffer. When the hybrid with relatively-higher amount of the silica element, the strong phosphorescence was observed even under the aerobic conditions. In contrast, the emission from the hybrids with lower amounts of the silica element was quenched under the hypoxic conditions. This is, to the best of our knowledge, the first example to demonstrate that the responsiveness of the phosphorescence intensity of PtOEP in hybrid films to the dissolved oxygen concentration in water can be modulated by changing the percentage of the contents in the material.
authors.affiliation: Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan; Matsumoto Yushi-Seiyaku Co., Ltd, 2-1-3, Shibukawa-cho, Yao-City, Osaka 581-0075, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Okada
authors.affiliation: Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Tanaka
authors.affiliation: Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan. Electronic address: chujo@chujo.synchem.kyoto-u.ac.jp.
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Chujo
mesh_terms: D008163:Luminescent Measurements; D008956:Models, Chemical; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011166:Porphyrins / Q000737:chemistry*; D011205:Povidone / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D014867:Water / Q000737:chemistry*
chemical_list: D011108:Polymers; D011166:Porphyrins; D012821:Silanes; C488938:octaethylporphyrin; D014867:Water; C071718:methyltrimethoxysilane; D010984:Platinum; D012822:Silicon Dioxide; D011205:Povidone; D010100:Oxygen
keywords: Hybrid; Oxygen; Porphyrin; Sensor