Magnetic field induced alignment of cyanine dye J-aggregates

Shklyarevskiy, I. O.; Boamfa, Marius I.; Christianen, P.C.M.; Touhari, F.; Kempen, H. van; Deroover, G.; Callant, P.; Maan, J. C.

doi:10.1063/1.1471555

Cited by 30 publications

(29 citation statements)

References 11 publications

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“…From this point of view, the behavior of PNC was studied in meth anol, 3,4 propanol, 5 glycerol, 3,5 propan 2 ol, 3 and other alcohols, 6 including those containing surfactants. 7 Pina cyanol is prone to manifest aggregation both in solu tions 8, 9 and at interfaces (for example, in colloidal silica particles 10 ), which is characteristic of the cyanine dyes. Interactions of PNC with polymers 11 and biopolymers 12 produce thin films, whereas PNC gains optical activity when binding with DNA.…”

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confidence: 99%

Regularities of homo- and heteroassociation of the pinacyanol cation in aqueous solution

Shapovalov

Samoilov

2008

Russ Chem Bull

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The ability of the cation of the cyanine dye (pinacyanol) to association in an aqueous solution was studied. The most probable structures of the pinacyanol cation, its dimer, and heteroassociates with anionic forms of several dyes were proposed on the basis of an analysis of the spectral and calculat ed data.Polymethines play a special role among the cyanine dyes. Interest in them is due to the purposeful selection of compounds with the necessary protolytic and spectral luminescence characteristics in true solutions, colloidal systems, and oligomeric media. Great attention is given to pinacyanol (PNC), viz., quinaldine blue. The system atic name of the single charged PNC cation is 1 ethyl 2 [3 (1 ethyl 1H quinolin 2 ylidene)propenyl]quinoli nium. More briefly, although not exactly, in scientific and information literature 1 PNC is called 1,1´ diethyl 2,2´ carbocyanine.Primarily PNC was tested as a standard of the black and white photographic material. 2 The most part of fur ther investigation is related to the study of the properties of PNC in liquid media of various nature. From this point of view, the behavior of PNC was studied in meth anol, 3,4 propanol, 5 glycerol, 3,5 propan 2 ol, 3 and other alcohols, 6 including those containing surfactants. 7 Pina cyanol is prone to manifest aggregation both in solu tions 8,9 and at interfaces (for example, in colloidal silica particles 10 ), which is characteristic of the cyanine dyes. Interactions of PNC with polymers 11 and biopolymers 12 produce thin films, whereas PNC gains optical activity when binding with DNA. 13 In this case, Coulomb forces are the main reason for binding between the cation and the negatively charged phosphate groups of the polymeric acid. 14 Due to the spectrally pronounced interaction with the organized structures, 15,16 PNC was used to de termine the critical micelle concentration of some anionic surfactants. 17, 18 The ability of polymethine cations to interact with organic counterions is also important. This can result in a substantial change in the optical properties of the sys tems due to the formation of ionic associates, aggregates, and molecular ensembles at very low dye concentrations in solutions (~5•10 -7 mol L -1 ). 19 The association of dyes in aqueous systems is of special interest, because water serves as a medium in which the interacting protolytic and aggregative forms exhibit unique spectral lumines cence properties. 20 The associate of a dye (not only poly methine) can act as an analytical reagent, color marker, and bioprobe. This finds use for solving several urgent problems, among which are monitoring of the dimeriza tion and trimerization of nucleic acids, 21 the incorpora tion of photosensitive agents into materials containing cyclodextrins, 22 and search for antibiotics and antitumor drugs. 23, 24 We have earlier 25-28 found a possibility of interaction of the PNC cation (Ct + ) and its structural analogs with a series of organic anions forming ionic associates of different stoichiometric composition in aqueous solu tio...

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Regularities of homo- and heteroassociation of the pinacyanol cation in aqueous solution

Shapovalov

Samoilov

2008

Russ Chem Bull

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“…A number of methods have been developed to form and to align the aggregates such as vertical spin coating, [5][6][7] flow of solution, 8 evaporation of solution, 9 and magnetic fields. 10 Here, we report a new method to prepare highly ordered J-aggregates by the electrospinning process within submicrometer diameter poly-(vinyl alcohol) (PVA) fibers. The formation and alignment of J-aggregates of dye molecules via electrospinning has not yet been reported according to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Formation of Pseudoisocyanine J-Aggregates in Poly(vinyl alcohol) Fibers by Electrospinning

2009

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Submicrometer diameter, light emitting fibers of poly(vinyl alcohol) (PVA) doped with pseudoisocyanine (1,1′-diethyl-2,2′-cyanine bromide, PIC) dye were prepared by electrospinning. A horizontal setup was employed with a stationary collector consisting of two parallel-positioned metal strips separated by a void gap. Formation of uniaxially aligned and randomly deposited fibers in electrospun films was confirmed by microscopy. Photoluminescence (PL) spectroscopy is used to evaluate spectral properties of both types of fibers doped with PIC. While PIC molecules were individually dispersed in PVA solution, they assemble into J-aggregates upon electrospinning when the weight fraction of PIC molecules is above 2.5 wt %. The formation of J-aggregates was observed in both randomly deposited and uniaxially aligned electrospun fibers. Moreover, the fibers aligned uniaxially showed a high degree of polarized emission (PL | /PL ⊥ ) 10), arising from the orientation of J-aggregates along the fiber axis. On the other hand, isotropic emission of J-aggregates was observed from the fibers deposited randomly. As a conclusion, electrospinning was found to be an efficient and a practical method to form highly oriented J-aggregates dispersed into polymer fibers. To the best of our knowledge, it is the first time formation of J-aggregates (a bottom-up approach) and electrospinning (a topdown approach) is successfully combined.

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“…This principle of the fabrication is expected to produce microstructures with a high optical response, which is different from the other fabrication and control techniques of J aggregates by using static electric or magnetic fields which act on static dipole moment. 4 FIG. 3.…”

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“…For this purpose, a thin film or micropatterns of J aggregate over a wide area has been prepared by using centrifugal force, solution flow, magnetic fields, and dewetting of solution. [2][3][4][5] On the other hand, considering the development of a molecular nanodevice, microfabrication technique of J aggregates is necessary.…”

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Laser microfixation of highly ordered J aggregates on a glass substrate

Tanaka

Yoshikawa

Asahi

et al. 2007

Applied Physics Letters

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The authors have developed a laser microfixation technique of J aggregates from pseudoisocyanine solution onto a glass substrate. By focusing a near-infrared (NIR) laser beam into the solution near the glass substrate, conglomerate J aggregates are deposited at the focal point and fixed on the substrate. Fixed J aggregates show a narrower fluorescence band than the deposited one without laser focusing, indicating that highly ordered J aggregates are selectively confined in the laser focus due to optical trapping. Furthermore, they have demonstrated that the orientation of the transition dipole in fixed J aggregates is controlled by the polarization direction of the NIR laser beam.

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Magnetic field induced alignment of cyanine dye J-aggregates

Cited by 30 publications

References 11 publications

Regularities of homo- and heteroassociation of the pinacyanol cation in aqueous solution

Regularities of homo- and heteroassociation of the pinacyanol cation in aqueous solution

Formation of Pseudoisocyanine J-Aggregates in Poly(vinyl alcohol) Fibers by Electrospinning

Laser microfixation of highly ordered J aggregates on a glass substrate

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