Preparation and Intercalation of Fluorescein in a Reconstructed Zinc/Aluminum Layer Double Hydroxide (LDH)
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MRS Advances © 2017 Materials Research Society DOI: 10.1557/adv.2017.602
Preparation and Intercalation of Fluorescein in a Reconstructed Zinc/Aluminum Layer Double Hydroxide (LDH)
Jose F Ramirez-Rodriguez, Ivan Bustamante-Hernandez, Tomas Viveros-Garcia, Universidad Autónoma Metropolitana-Iztapalapa. Departamento de Procesos e Hidráulica.
Av. San Rafael Atlixco No.186, Col. Vicentina. C.P.09340, Iztapalapa, D.F. México.
A Zn/Al LDH with fluorescein intercalated as counterion with fluorescent properties was prepared. Fluorescein was prepared by the reaction between resorcinol and phthalic anhydride using the mixed oxide obtained after the thermal treatment of the LDH as catalyst. The material thus obtained, i.e. fluorescein adsorbed onto the mixed oxide from the calcined LDH, was treated with a mixture of water and pentanol in order to reconstitute the LDH and intercalate the fluorescein in the material. Three mixtures of water/pentanol with volume percent ratios of 100/0, 50/50, 20/80, were used to obtain the LDH with fluorescein intercalated. The best treatment could be determined according to the degree reconstruction and fluorescein intercalated into the LDH.
INTRODUCTION The controlled organization of fluorescent organic dyes in a solid matrix offers numerous prospective applications in the field of sensing technologies [1]. In particular, fluorescent -conjugation are the central focus of numerous chemical, analytical, biological and spectroscopic studies, since these materials present the prominent advantages of high molar extinction coefficients, environment-friendliness, along with the availability of low-cost sources of irradiation [2]. Organic chromophores generally show high fluorescence efficiency in solution, while it decreases rapidly in the solid state. This is mainly attributed to the intermolecular vibronic interactions which induce the nonradiative deactivation process (i.e., fluorescence quenching) [3]. Hence, great efforts have been devoted to design and synthesize new types of conjugation derivatives to overcome or compensate these disadvantages. Therefore, it is important to search for novel fluorescence materials with high photostability, which can maintain or even improve fluorescence efficiency in the solid state [4]. Doping with dyes which show fluorescent or non-linear optical properties has been well investigated, because the prospect of obtaining these optical properties in the solid state matrix (bulk 3805
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or thin film) is extremely attractive for device applications. However, a key issue which strongly influences these properties is instability of physical mixtures [5]. Fluorescein can be prepared from phthalic anhydride and resorcinol in the presence of zinc chloride via the Friedel-Crafts reaction, according to the reaction show in Figur
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