{"title":"Synthesis of hexagonal Y type zeolites in the presence of Gd(III) complexes of 18-crown-6","authors":"Kenneth J. Balkus Jr., Jimin Shi","doi":"10.1016/S0927-6513(97)00054-0","DOIUrl":null,"url":null,"abstract":"<div><p>Zeolite hexagonal Y was successfully synthesized in the presence of both 18-crown-6 and the Gd(III) complexes of 18-crown-6 as templates. The crystallization times as well as the gadolinium content in the hexagonal Y were found to increase with increasing ratios of Gd<sup>3+</sup> -18-crown-6/SiO<sub>2</sub> in the initial gel compositions. The resulting hexagonal Y zeolites were characterized by XRD, FT-IR and SEM. Partial evidence for the template role and encapsulation of Gd<sup>3+</sup> -18-crown-6 are described. The room temperature proton relaxivities of aqueous suspensions of hexagonal Y entrapped Gd<sup>3+</sup>-18-crown-6 were measured. The pH stability of the hexagonal Y samples was also determined. Based on these results the potential application of hexagonal Y synthesized with Gd<sup>3+</sup>-18-crown-6 as oral MRI contrast agent is discussed.</p></div>","PeriodicalId":100926,"journal":{"name":"Microporous Materials","volume":"11 5","pages":"Pages 325-333"},"PeriodicalIF":0.0000,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0927-6513(97)00054-0","citationCount":"14","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microporous Materials","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0927651397000540","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 14
Abstract
Zeolite hexagonal Y was successfully synthesized in the presence of both 18-crown-6 and the Gd(III) complexes of 18-crown-6 as templates. The crystallization times as well as the gadolinium content in the hexagonal Y were found to increase with increasing ratios of Gd3+ -18-crown-6/SiO2 in the initial gel compositions. The resulting hexagonal Y zeolites were characterized by XRD, FT-IR and SEM. Partial evidence for the template role and encapsulation of Gd3+ -18-crown-6 are described. The room temperature proton relaxivities of aqueous suspensions of hexagonal Y entrapped Gd3+-18-crown-6 were measured. The pH stability of the hexagonal Y samples was also determined. Based on these results the potential application of hexagonal Y synthesized with Gd3+-18-crown-6 as oral MRI contrast agent is discussed.
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