Enhancement of NIR emission by a tight confinement of a hemicyanine dye within zeolitic MgAPO-5 nanochannels

Abstract

The encapsulation of a hemicyanine dye, LDS 730, into the 1D nanochannels of MgAPO-5 aluminophosphate by "one-pot" synthesis, based on "in situ" occlusion via a crystallization inclusion method, has led to a hybrid material with emission in the NIR region. The tight fitting between the molecular size of the guest dye and the pore dimensions of the host has enabled a rigid conformation of the LDS 730 dye within the nanochannels. Consequently, fluorescence in the NIR range of the spectra is enhanced with respect to the dye in solution. The synthesis of the hybrid material was optimized through a systematic variation of the gel composition via MW in order to obtain a pure phase.

Exploiting the photophysical features of DMAN template in ITQ-51 zeotype in the search for FRET energy transfer

“…[9][10][11][12][13][14][15][16][17][18] Furthermore, the photophysical properties of the enclosed fluorophores are usually enhanced by restricting molecular motions due to confinement effects for hostguest systems with proper size-match. [19][20][21][22][23] In this context, zeolitic materials with micropores of molecular size have been found as ideal host matrices for the encapsulation of photoactive molecules, and those built up by Mg-containing aluminophosphate networks are particularly interesting. 6,19,20,24,25 In the background of artificial photosynthetic systems, one of the most interesting photophysical processes is the so-called a Departamento de Quı ´mica Fı ´sica, Universidad del Paı ´s Vasco (UPV/EHU), Apartado 644, 4808 Bilbao, Spain.…”

“…9–18 Furthermore, the photophysical properties of the enclosed fluorophores are usually enhanced by restricting molecular motions due to confinement effects for host–guest systems with proper size-match. 19–23 In this context, zeolitic materials with micropores of molecular size have been found as ideal host matrices for the encapsulation of photoactive molecules, and those built up by Mg-containing aluminophosphate networks are particularly interesting. 6,19,20,24,25…”

“…19–23 In this context, zeolitic materials with micropores of molecular size have been found as ideal host matrices for the encapsulation of photoactive molecules, and those built up by Mg-containing aluminophosphate networks are particularly interesting. 6,19,20,24,25…”

“…[19][20][21][22][23] In this context, zeolitic materials with micropores of molecular size have been found as ideal host matrices for the encapsulation of photoactive molecules, and those built up by Mg-containing aluminophosphate networks are particularly interesting. 6,19,20,24,25 In the background of artificial photosynthetic systems, one of the most interesting photophysical processes is the so-called a Departamento de Quı ´mica Fı ´sica, Universidad del Paı ´s Vasco (UPV/EHU), Apartado 644, 4808 Bilbao, Spain. E-mail: ainhoa.oliden@ehu.eus, rebeca.sola@ehu.eus, virginia.martinez@ehu.eus b Instituto de Cata ´lisis y Petroleoquı ´mica, CSIC, c/Marie Curie 2, 28049 Cantoblanco, Madrid, Spain.…”