DCM dye

The emission of the Alq3 DCM system appears orange and not red as the spectrum of the pure DCM dye because of a nonideal overlap of the energy states for Forster transfer. A purer red emission can be obtained in a three-component system with both rubrene (62) and DCM2 (62b) as dopants. The energy transfer occurs in two steps via rubrene to DCM2 [150]. Here, the emission of DCM2 is at... 

All these phenomena can occur simultaneously within the same material, as illustrated by the spectral response of an oriented polymer doped with DCM dye (4-dicyanomethylene-2-methyl-6-p-dimethylamino-styryl-4H-pyran) under 1.06 iJ,m laser irradiation (Figure 1.1). The two sharp signals at 532 and 354 nm are coherent emission induced by SHG and THG, whereas the broad band is incoherent emission of two-photon excited fluorescence (TPEF). 

Fig ire 2. Spectroscopy of DCM dye in chloroform (a) and in PMMA (h). Note the change in Stokes shift. The spectra of many other dyes were recorded similarly. 

A synchronously pumped DCM dye laser was used as the picosecond light source in the pump-probe experiments. A Soleil-Babinet compensator in the excitation beam was set so that the polarization of the excitation and probe beams were parallel or perpendicular. Fluorescence anisotropies were measured with a Spex fluorolog spectrometer. The time resolved fluorescence was measured by single photon counting. 

Figure 5.21 (A) Structures of AIE-active TPE unit incorporated into traditional DCM dye. (B) Schematic illustration of the fabrication of...

Kovalenko S A, Ernsting N P and Ruthmann J 1996 Femtosecond hole-burning spectroscopy of the dye DCM in solution the transition from the locally excited to a charge-transfer state Chem. Phys. Lett. 258 445-54... 

Marguet, S., Mialocq, J. C., Millie, P., Berthier, G. and Momicchioli, F. Intramolecular charge transfer and trans-cis isomerization of the DCM styrene dye in polar solvents. A CS-INDO MRCI study,... 

The dyes used most frequently as dopants are rubrene (61) and the dicyano-methylene dyes (62). Rubrene is able to convert the Alq3 fluorescence to yellow (570 nm), DCM 4-dicyanomethylene-2-methyl-6-(p-dimethylaminostyryl)-477-pyran, (62a) and its derivatives, 62b-d [149] to orange (600 nm). The quantum efficiencies are enhanced strongly to values near 100% upon doping with the dyes. For rubrene in Alq3, a quantum efficiency of 95 5% was reported [139]. 

We studied electrochemically induced ET between a ferrocene derivative (FeCp-X) in single oil droplets and hexacyanoferrate(III) (Fe(III)) in the surrounding water phase the reaction system is schematically illustrated in Figure 11 [50,74], Tri-n-butyl phosphate (TBP) containing FeCp-X (ferrocene [X = H] or decamethylferrocene [X = DCM]), a fluorescent dye (perylene [Pe 0.5 mM] or 9,10-diphenylanthracene [DPA 10 mM]), and TBA+TPB (lOmM) is dispersed in an aqueous solution containing TBA+Cr, MgS04 (0.1 M), and potassium hexacyanoferrate(II) (Fe(II) 0.2 mM) with a 1 500 (oil/water) weight ratio as a sample emulsion. 

Another water-soluble (3-CD (105) bearing seven naphthoyl chromophores forms very stable 1 1 complexes with a merocyanine laser dye DCM-OH [90], The energy transfer from the naphthoyl antenna chromophores to the included dye is shown to occur with 100% efficiency (antenna effect) (Scheme 3). 

Fig. 17.16 Synthesis of benzimidazolium hemicyanine dyes. Reagents and conditions (a) triethyl orthoacetate, H+, toluene, reflux (b) KOH, Mel, acetone (c) Tf20, poly(4-vinylpyridine), DCM (d) 4, DCM (e) 48% HBr, 65°C (f) 2-chlorotrityl alcohol resin sequentially treated with thionyl chloride in DCM and ethylene diamine in DCM (g) 8, HATU, DIPEA, 30% DMF/DCM (h) R-CHO (96-aromatic aldehydes), pyrrolidine, NMP (i) 5% TFA/DCM...

The 3D fluorescence data set, consisting of 20 (Ex) x 640 (Em) x 24 (t) data points was measured for four kinds of fluorescent dyes Coumarin 540 (C540), DCM,... 

Finding a supramolecular system capable of fast and spatially controllable release of cations upon irradiation is of great interest for the study of intracellular process triggered by an ion concentration jump [42, 43, 45-47]. The complex of metal ions with a crown ether-linked merocyanine (DCM-crown) is an example of system (Scheme 7.9) which can temporarily release ions [46]. DCM-crown consists of DCM, a well-known laser dye, in which the dimethylamino group has been replaced by a macrocycle (monoaza-15-crown-5) that can bind metal ions [42]. 

The fluorescence properties of DCM, 4-cyanomethylene-2-methyl-6-p-dimethyl aminostyryl-4H pyran, show that there is thermal equilibrium between the cis- and trans-isomers. There is no observable aggregation of this dye except in liquid membranes. Polarized absorption and emission spectra of stilbazolium merocyanines and the properties of pyrylium and thiopyrylium high efficiency laser dyes are topics covered other related publications. 

Soluble resin 51, based on an acrylamide backbone, was also prepared by Berg-breiter, using an approach similar to that considered for 50. In this case the polymer is soluble in polar solvents. The presence of the azo dye (DFdye = 0.0002) is used to check that less than 0.1% of the resin remains in the solution after precipitation with hexanes. This catalyst was able to both catalyze efficiently the acetylation of 1-methylcyclohexanol to give 45 and afford BOC protection of phenols to prepare structures similar to 53 in DCM at room temperature (Scheme 10.11). These reactions required very low catalyst loadings (0.2-5 mol.%). No problems were found for the recycling of 51 [190]. 

DCM styrene dye, has been studied by a combined application of both... 

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