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Title

INCORPORATION OF NI(II) TETRASULFOPHTHALOCYANINE INTO MCM-41 MESOPOROUS SILICA: A SPECTROSCOPIC ANALYSIS

Pages

 Start Page | End Page

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Abstract

 THE METALLOPHTHALOCYANINES CAN BE IMMOBILIZED ON VARIOUS SUPPORTS IN ORDER TO FUNCTION AS HETEROGENEOUS CATALYSTS AND PHOTOCATALYSTS. MCM-41 HAS ATTRACTED INTEREST AS A SUPPORT FOR THE IMMOBILIZATION OF VARIOUS CATALYSTS IN GENERAL AND METALLOPHTHALOCYANINES IN PARTICULAR. THESE MATERIALS OFFER DISTINCT ADVANTAGE OVER CONVERTIONAL SUPPORTS. THEY USUALLY PROVIDE A NARROW PORE SIZE DISTRIBUTION IN THE MESOPORE SIZE RANGE. MCM-41 WITH A LARGE PORE VOLUME CAN ACCOMMODATE METALLOPHTHALOCYANINES. IN THIS WORK NI (II) TETRASULFOPHTHALO-CYANINE (NIPCS) WERE INCORPORATED INTO MCM-41VIA POSTSYNTHESIS METHOD USING 3- AMINOPROPYLTRIETHOXYSILANE (APTES) AS A FUNCTIONAL REAGENT [1, 2].THE SURFACTANT-TEMPLATED MCM-41 WAS SYNTHESIZED USING A COMMON ROOM TEMPERATURE SYNTHESIS METHOD ADOPTED IN OUR LABORATORY.CETYLTRIMETHYL-AMMONIUM BROMIDE WAS USED AS TEMPLATE FOR THE PREPARATION OF MESOPOROUS MCM-41.THE CATIONIC SURFACTANT PRESENT IN THE PORES IS REMOVED BY CALCINATIONS PRIOR TO FUNCTIONALIZATION. THEN, MCM-41 WAS MODIFIED BY 3- AMINOPROPYLTRIETHOXYSILANE. THE IMMOBILIZATION OF NIPCS ON THE INNER SURFACE OF THE PORES OF NH2-MCM-41 OCCURS BY MEANS OF CHEMICAL BONDING WITH THE AMINE GROUPS. THE PRODUCT WERE CHARACTERIZED USING XRD, BET, DRS, FTIR, AND EDX-SEM METHODS.LOW-ANGLE X-RAY DIFFRACTION STUDIES SHOWED A SUCCESSFUL SYNTHESIS OF MCM-41. THE XRD RESULTS ALSO CONFIRM THAT THE FUNCTIONALIZED MESOPOROUS (NH2-MCM-41) AND NIPCS-MCM-41 PRESERVE THEIR STRUCTURAL ORDERING OF THE MESOPOROUS SYSTEM. HOWEVER, THESE SAMPLES SHOW THE REDUCED INTENSITIES FOR THE MAIN SPECIFIC XRD PEAK. THE DIFFUSE REFLECTANCE UVVIS SPECTRA SHOW THE MAXIMA FOR THE DIFFERENT POSITIONED NIPCS SPECIES INCORPORATED INTO THE STRUCTURE OF MCM-41. A STRONG INTERACTION OF NIPCS ACIDIC PROTONS WITH AMINE GROUPS MAY BE INVOLVED IN RETENTION OF NIPCS IN THE STRUCTURE. FURTHER STUDIES ARE UNDERWAY TO FULLY CHARACTERIZE THE PRODUCTS AND EXAMINE ITS APPLICATION IN ELECTROCHEMICAL AND PHOTOCHEMICAL CONVENTIONS.

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