Capri Blue

Capomesser, m. a kind of meter for gases. Capriblau, n. Capri blue. 

Methylene blue, new methylene blue, thionine blue, Capri blue, cresyl blue, brilliant cresyl blue, Nile blue, Basle blue, Mel-dola s blue, fast navy blue, new blue, metamine blue, naphthol u, blue, metaphenylene blue, paraphenylene blue, mdamine blue, indazine, neutral blue, muscanne, diphene blue, rhoduline blue, rhoduline sky blue frl ... 

Among oxazine dyes are Capri Blue (formula 4.31), Nile Blue A (formula 4.32) and Mendola s Blue. Safranine T [75] represents a phenazine dye (formula 4.33). The absorption spectra of the three azine dyes are presented in Fig. 4.3. 

Fig. 4.3. Absorption spectra of Methylene Blue (1), Capri Blue (2) and Safranine T (3)...

Besides the Methylene Blue, other spectrophotometric methods, based on ion-associates of anionic boron complexes with basic dyes are used. Extractable associates with BF4 are obtained with Nile Blue A (formula 4.32) [7,36,37], Capri Blue (formula 4.31) [38], Malachite Green (formula 4.26, with Me instead of Et), Chrompyrazole II (CHCI3, e = 6.7-10 at 595 nm) [40], etc. 

Many other basic dyes besides Methyl Violet have been used in sensitive extraction-spectrophotometric methods for the determination of Ta as the anionic complex TaFe [92]. Mention may be made of Crystal Violet (formula 4.27) (e = 8.5-10" ) [91-93], Brilliant Green (e = 1.2-10 ) [94,95], Malachite Green [96,97], Methyl Green (e = 1.2-10 ) [98], Rhodamine 6G and butylrhodamine B [99], Methylene Blue (e = 9.1-10" ) [98], Nile Blue A [100], Capri Blue (e = I.TIO ) [101], and Victoria Blue B [102]. Ion-associates with these dyes are extractable from acid solutions into benzene, toluene, CHClj, xylene, or dichloroethane. 

Besides the Rhodamine 6G-SnCl2 flotation-spectrophotometric method described above, similar methods using other basic dyes, e.g., Victoria Blue B, Victoria Blue 4R, Capri Blue [41], Crystal Violet (e = 2.1-10 ) [42], or Nile Blue A [43], have been proposed. An ion-associate of the chloride platinum complex with Methyl Green has been extracted with a mixture of 1,2-dichloroethane and CCI4 (e = 1.45-10 ) [44]. The ion-associate of the Pt-thiocyanate complex with Malachite Green has been extracted with benzene [45], and a thiocyanate- or iodide- Pt complex associated with Crystal Violet has been extracted into xylene or toluene [46]. 

The spectrophotometric method for determination of Ru with the use of 1,4-diphenylthiosemicarbazide is rather insensitive, as compared with the very sensitive method based on an ion-associate of the anionic Ru(III)-SCN complex with the basic dye, Capri Blue. 

The anionic thiocyanate complex of ruthenium(IIl), Ru(SCN)6, reacts with Capri Blue (basic oxazine dye, formula 4.31) to form a sparingly soluble ion-associate which precipitates at the phase boundary and on the wall of the separating funnel during shaking of the aqueous phase with DIPE. After separation, the ion-associate is dissolved in methanol and the absorbance of the solution is measured [41]. 

The absorbance depends on the concentration of thiocyanate and the pH, and also on the time and temperature of heating of the ruthenium solution with thiocyanate. The ruthenium complex is formed quantitatively when the solution is heated for at least 10 min, with a thiocyanate concentration greater than 0.15 M and pH 0.5-3.5. At least a 15-fold molar excess of Capri Blue is necessary. 

The ion-associate of SCN with Capri Blue separates together with the ion-associate of ruthenium. The former decomposes during washing with water. If the precipitate and the DIPE are shaken with three portions of water the excess of the dye is nearly completely removed the absorbance of the blank does not exceed 0.07. 

The method is not selective. Other platinum metals also form floatable ion-associates with SCN and Capri Blue. Certain other metals, such as Au, Ag, Cu, Hg, and W, also interfere, and hence a preliminary separation of Ru is necessary. For example, distillation of the tetroxides allows Ru and Os to be isolated from practically all other metals. Then, extraction from thiocyanate medium [14] separates Os and Ru, and one after the other can be determined, e.g., with Capri Blue. 

The method based on the ion-associate with Capri Blue has already been presented. The thiocyanate-Ru complex has also been associated with Crystal Violet and Rhodamine 6G (in the presence of gelatine) (e = 1.4-10 ) [15,51]. The ion-associate of the Ru complex with SnCff and Crystal Violet is a basis of a flotation-spectrophotometric method of Ru determination (e = 2.110 at 600 nm) [52]. More sensitive methods are based on flotation of... 

Capri Blue 42 is prepared by condensation of iV,A -dimethyl-4 nitrosoanilinmm chloride with 3-diethylamino-4-methylphenol. The intermediate is the salt of a substituted phenylquinone diimine (indamine), which is oxidized by excess of the nitroso compound ... 

The partially resolvable. Those containing the dissolved substance in two phases the optically void, and those in the form of ultramicrons. To this class belong concentrated aqueous solutions of Fuchsine, Methyl Violet, Neutral Red, Capri Blue, etc. 

Caffeine 478, 479 Camptothecin 405 Cannabinol 345 Cantharidin 89 Carazolol 149 l,l -Carbonyldiimidazol 228 Carlina oxide 78 Capri Blue 446 e-Caprolactam see azepan-2-one Captopril 161 Carbamazepine 539 Carbazole 148, 149 Carbostyryl 387 Cardiazol see pentetrazole Catechin 340 Cefatrizin 264 Celecoxib 243 Cephalosporin 455 Cepham 455 Cerivastin 379 Chalciporon 539 Chelidonic acid 335 Chemiluminescence 55 1-Chlorobenzotriazole 267 Chlordiazepoxide 544 Chlorin 551... 

H Methyl Capri Blue -e Methyl Capri Blue... 

Strictly the name Capri blue applies to the chloride. Chloride [1787-57-1]. 

Chloride, double salt with ZnCl2 [7199-02-2]. Capri blue GN. Capri blue GON L). C.I. 51015 Used as a redox indicator in aq. soln. Blue cryst. (dil. HCl aq.). Sol. H2O, EtOH. 

Cantabiline, see H-00283 Capitrol, see D-00283 Capri blue, C-00017 Capri blue GN, C-00018 Capri blue GNf, in C-00017 Capri blue GON(L), in C-00017... 

Ethyl butyrate, in B-00604 Ethyl capri blue, E-00067 O-Ethyl carbamothioate, in T-00159 5-Ethyl carbamothioate, in T-00159... 

Methyl butyrate, in B-00604 Methylcalcein, M-00152 Methylcalcein blue, M-00153 Methyl capri blue, see C-00018 Methylcarbamothioic acid, M-00154... 

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