Electrogenerated chemiluminescence intensity

The intensity of electrogenerated chemiluminescence is influenced by an external magnetic field 148,150,152)... 

A unique CL reagent, /n.v(2,2 -bipyridyl)rut.hcnium(II) [Ru(bpy)32+] for the postcolumn CL reaction, was applied to HPLC detection. The oxidative-reduction reaction scheme of CL from Ru(bpy)32+ is shown in Figure 17. When the production of light following an oxidation of Ru(bpy)32+ to Ru(bpy)33+ at an electrode surface is measured, this CL reaction is termed electrogenerated chemiluminescence (ECL). The CL intensity is directly proportional to the amount of the reduc-tant, that is, the analyte. 

Electrogenerated chemiluminescence (ECL) experiments [7] are difficult to perform in the dry box due to the need to exclude light from all external sources. Placing a black cloth over the dry box window is usually not sufficient unless the intensity of the ECL is very high. It may be necessary to use a monochromator in these experiments. This is especially unfortunate in the case of ECL at an RRDE, since the complexity of cell and motor assembly is greatly increased. Nevertheless, the dry box is very useful for performing initial ECL experiments, perhaps to establish whether or not ECL occurs. 

In fluid solutions, Faulkner and Bard first found the MFEs on the electrogenerated chemiluminescence of anthracence triplet-triplet annihilation [4], The general features of the MFEs were similar to those observed in crystals the intensity of delayed fluorescence was found to decrease with increasing B from 0 T to 0.8 T and to approach as3miptotically a value which was about 4 % below the zero-field intensity. They also found the MFEs on the anthracene fluorescence in the presence of doublet species such as Wurster s Blue perchlorate [5] the fluorescence intensity was found to be quenched by the doublet species, but the quenched intensity was found to be increased by magnetic fields. Their typical results are shown in Fig. 12-2. Although these MFEs observed in fluid solutions were smaller than those in crystals due to rotational motion of triplet molecules, the MFEs in solutions could also be explained by Eqs. (13-3) and (13-9). The magnetically induced decrease in the... 

To date, there have been no data on electroluminescent thin film devices with spirothiophenes available, but BSuerle et al. examined the appUcability of these compounds by electrogenerated chemiluminescence experiments. They found for the quaterthiophene 98 an intense but unstable electrochemiluminescence because of the instabihty of the radical anion. On the other hand, the sexithiophene 99 showed a more intense and more stable electrochemiluminescence. The emission spectra center around 506 nm and 560 nm for 98 and 99, respectively. 

Faulkner LR, Tachikawa H, Bard AJ (1972) Electrogenerated chemiluminescence. VII. Influence of an external magnetic field on luminescence intensity. J Am Chem Soc 94(3) 691-699. doi 10.1021/ja00758a001... 

Kanoufi F, Bard AJ (1999) Electrogenerated Chemiluminescence. 65. An investigation of the oxidation of oxalate by tris(polypyridine) ruthenium complexes and the effect of the electrochemical steps on the emission intensity. J Phy Chem B 103(47) 10469-10480. doi 10.1021/jp992368s... 

Li F, Zu Y (2004) Effect of nonionic fluorosurfactant on the electrogenerated chemiluminescence of the tris(2,2 -bipyridine)ruthenium(II)/tri-n-propylamine system lower oxidation potential and higher emission intensity. Anal Chem 76(6) 1768-1772. doi 10.1021/ac035181c... 

Zu Y, Bard AJ (2000) Electrogenerated chemiluminescence. 66. The role of direct coreactant oxidation in the ruthenium tris(2,2 )bipyridyl/tripropylamine system and the effect of halide ions on the emission intensity. Anal Chem 72(14) 3223-3232... 

Cmser SA, Bard AJ (1967) Concentration-intensity relationships in electrogenerated chemiluminescence. Anal Lett 1(1) 11—17... 

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