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Photoionization of organic molecules...

University of Houston.

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Photoionization of organic molecules in MCM-41, AlMCM-41 and metal containing AlMCM-41 mesoporous materials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Photoionization of organic molecules in MCM-41, AlMCM-41 and metal containing AlMCM-41 mesoporous materials./
作者:	Sinlapadech, Sunsanee.
面頁冊數:	165 p.
附註:	Adviser: Allan J. Jacobson.
Contained By:	Dissertation Abstracts International64-03B.
標題:	Chemistry, Inorganic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3085619
ISBN:	9780496334261

Photoionization of organic molecules in MCM-41, AlMCM-41 and metal containing AlMCM-41 mesoporous materials.
Sinlapadech, Sunsanee.

Photoionization of organic molecules in MCM-41, AlMCM-41 and metal containing AlMCM-41 mesoporous materials. - 165 p.

Adviser: Allan J. Jacobson.

Thesis (Ph.D.)--University of Houston, 2003.

A family of mesoporous MCM-41 and AlMCM-41 materials was successfully synthesized. Transition metal ions such as Ni(II), Cu(II), Fe(III) and Cr(III) were incorporated into these mesoporous materials by ion-exchange. The samples were characterized by powder X-ray diffraction (XRD) and nitrogen adsorption. Elemental compositions of these materials were determined by electron microprobe analysis or X-ray fluorescence.

ISBN: 9780496334261Subjects--Topical Terms:

517253
Chemistry, Inorganic.

Photoionization of organic molecules in MCM-41, AlMCM-41 and metal containing AlMCM-41 mesoporous materials.
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245 1 0 $a Photoionization of organic molecules in MCM-41, AlMCM-41 and metal containing AlMCM-41 mesoporous materials.
300 $a 165 p.
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500 $a Source: Dissertation Abstracts International, Volume: 64-03, Section: B, page: 1243.
502 $a Thesis (Ph.D.)--University of Houston, 2003.
520 $a A family of mesoporous MCM-41 and AlMCM-41 materials was successfully synthesized. Transition metal ions such as Ni(II), Cu(II), Fe(III) and Cr(III) were incorporated into these mesoporous materials by ion-exchange. The samples were characterized by powder X-ray diffraction (XRD) and nitrogen adsorption. Elemental compositions of these materials were determined by electron microprobe analysis or X-ray fluorescence.
520 $a Photoionization of photosensitizer molecules N-alkylphenothiazine (PCn), N,N,N',N'-tetramethylbenzidine (TMB), pyrene (Py) and meso-tetraphenylporphine (H2 TPP) was studied in MCM-41 and modified MCM-41 mesoporous materials at room temperature. Electron spin resonance (ESR) make it possible to quantify and identify the photoionization yield of PCn+., TMB+., Py+. and H2TPP+. radical cations in the materials. Incorporation of Al into MCM-41 frameworks enhances the electron-accepting ability of the framework. Increasing the alkyl chain length of PCn affects the alkylphenothiazine cation radical photoyield and stability. The H2TPP+. photoyield was found to depend on the pore size in Cn-MCM-41 but the pore size was found to have no significant effect on the photoyield in Cn -AlMCM-41 materials. The photoyield intensity depends on the amount of the metal ion incorporated into MCM-41 materials. It is clear that Cr(V) is an electron acceptor during the photoirradiation of Cr-AlMCM-41/PC 1. PCn+., TMB+., Py +. and H2TPP+. cation radicals are stable in these oxides at room temperature from several hours to several days. These materials are shown to be effective heterogeneous hosts to achieve long-lived photoinduced electron transfer of photosensitizer molecules at room temperature.
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