Preparation and characterization of an anionic dye–polycation molecular films by electrostatic layer-by-layer adsorption process Export

@article{citeulike:5951055, abstract = {This communication reports the formation and characterization of self-assembled films of a low molecular weight anionic dye amaranth and polycation poly(allylamine hydrochloride) (PAH) by electrostatic alternating layer-by-layer (LBL) adsorption. It was observed that there was almost no material loss occurred during adsorption process. The UV–vis absorption and fluorescence spectra of amaranth solution reveal that with the increase in amaranth concentration in solution, the aggregated species starts to dominate over the monomeric species. New aggregated band at 600 nm was observed in amaranth–PAH mixture solution absorption spectrum. A new broad low intense band at the longer wavelength region, in the amaranth–PAH mixture solution fluorescence spectrum was observed due to the closer association of amaranth molecule while tagged into the polymer backbone of PAH and consequent formation of aggregates. The broad band system in the 650–750 nm region in the fluorescence spectra of different layered LBL films changes in intensity distribution among various bands within itself, with changing layer number and at 10 bilayer LBL films the longer wavelength band at 710 nm becomes prominent. Existence of dimeric or higher order n -meric species in the LBL films was confirmed by excitation spectroscopic studies. Almost 45 min was required to complete the interaction between amaranth and PAH molecules in the one-bilayer LBL film.}, author = {Dey, D. and Hussain, S. A. and Nath, R. K. and Bhattacharjee, D.}, citeulike-article-id = {5951055}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.saa.2007.08.005}, citeulike-linkout-1 = {http://linkinghub.elsevier.com/retrieve/pii/S1386142507004696}, doi = {10.1016/j.saa.2007.08.005}, issn = {13861425}, journal = {Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy}, keywords = {absorption, layer, lbl, spectrum}, month = {July}, number = {2}, pages = {307--312}, posted-at = {2009-10-16 13:44:42}, priority = {2}, title = {Preparation and characterization of an anionic dye–polycation molecular films by electrostatic layer-by-layer adsorption process}, url = {http://dx.doi.org/10.1016/j.saa.2007.08.005}, volume = {70}, year = {2008} }

TY - JOUR ID - citeulike:5951055 L3 - citeulike-article-id:5951055 N2 - This communication reports the formation and characterization of self-assembled films of a low molecular weight anionic dye amaranth and polycation poly(allylamine hydrochloride) (PAH) by electrostatic alternating layer-by-layer (LBL) adsorption. It was observed that there was almost no material loss occurred during adsorption process. The UV–vis absorption and fluorescence spectra of amaranth solution reveal that with the increase in amaranth concentration in solution, the aggregated species starts to dominate over the monomeric species. New aggregated band at 600 nm was observed in amaranth–PAH mixture solution absorption spectrum. A new broad low intense band at the longer wavelength region, in the amaranth–PAH mixture solution fluorescence spectrum was observed due to the closer association of amaranth molecule while tagged into the polymer backbone of PAH and consequent formation of aggregates. The broad band system in the 650–750 nm region in the fluorescence spectra of different layered LBL films changes in intensity distribution among various bands within itself, with changing layer number and at 10 bilayer LBL films the longer wavelength band at 710 nm becomes prominent. Existence of dimeric or higher order n -meric species in the LBL films was confirmed by excitation spectroscopic studies. Almost 45 min was required to complete the interaction between amaranth and PAH molecules in the one-bilayer LBL film. IS - 2 JF - Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy SN - 13861425 EP - 312 TI - Preparation and characterization of an anionic dye–polycation molecular films by electrostatic layer-by-layer adsorption process VL - 70 SP - 307 KW - absorption KW - layer KW - lbl KW - spectrum AU - Dey, D AU - Hussain, SA AU - Nath, RK AU - Bhattacharjee, D PY - 2008/07// UR - http://dx.doi.org/10.1016/j.saa.2007.08.005 ER -