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231223s2010 xx |||||o 00| ||eng c |
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|a 10.1021/la101463r
|2 doi
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|a pubmed24n0664.xml
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|a (DE-627)NLM199156778
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|a (NLM)20583774
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Das, Susmita
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Nontemplated approach to tuning the spectral properties of cyanine-based fluorescent nanoGUMBOS
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|c 2010
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 04.11.2010
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|a Date Revised 20.10.2021
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|a published: Print
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|a Citation Status MEDLINE
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|a Template-free controlled aggregation and spectral properties in fluorescent organic nanoparticles (FONs) is highly desirable for various applications. Herein, we report a nontemplated method for controlling the aggregation in near-infrared (NIR) cyanine-based nanoparticles derived from a group of uniform materials based on organic salts (GUMBOS). Cationic heptamethine cyanine dye 1,1',3,3,3',3'-hexamethylindotricarbocyanine (HMT) was coupled with five different anions, viz., [NTf(2)(-)], [BETI(-)], [TFPB(-)], [AOT(-)], and [TFP4B(-)], by an ion-exchange method to obtain the respective GUMBOS. The nanoGUMBOS obtained via a reprecipitation method were primarily amorphous and spherical (30-100 nm) as suggested by selected area electron diffraction (SAED) and transmission electron microscopy (TEM). The formation of tunable self-assemblies within the nanoGUMBOS was characterized using absorption and fluorescence spectroscopy in conjunction with molecular dynamics simulations. Counterion-controlled spectral properties observed in the nanoGUMBOS were attributed to variations in J/H ratios with different anions. Association with the [AOT(-)] anion afforded predominant J aggregation enabling the highest fluorescence intensity, whereas [TFP4B(-)] disabled the fluorescence due to predominant H aggregation in the nanoparticles. Analyses of the stacking angle of the cations based on molecular dynamic simulation results in [HMT][NTf(2)], [HMT][BETI], and [HMT][AOT] dispersed in water and a visual analysis of the representative simulation snapshots also imply that the type of aggregation was controlled through the counterion associated with the dye cation
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|a Journal Article
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|a Research Support, N.I.H., Extramural
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|a Research Support, Non-U.S. Gov't
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| 650 |
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|a Research Support, U.S. Gov't, Non-P.H.S.
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| 700 |
1 |
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|a Bwambok, David
|e verfasserin
|4 aut
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| 700 |
1 |
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|a El-Zahab, Bilal
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Monk, Joshua
|e verfasserin
|4 aut
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| 700 |
1 |
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|a de Rooy, Sergio L
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Challa, Santhosh
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Li, Min
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Hung, Francisco R
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Baker, Gary A
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Warner, Isiah M
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 26(2010), 15 vom: 03. Aug., Seite 12867-76
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:26
|g year:2010
|g number:15
|g day:03
|g month:08
|g pages:12867-76
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|u http://dx.doi.org/10.1021/la101463r
|3 Volltext
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