Methylene Green

This compound is obtained by treating methylene blue with nitrous acid. It dyes textile fibres a fine dark green colour, and appears, from its properties, to be a nitro-derivative of methylene blue. In its behaviour towards fibres it resembles. the latter. 

This denomination includes a series of compounds analogous to the thioindamines and containing an oxygen atom in place of the sulphur atom of the latter. 

These compounds are formed by the action of nitrosodimethyl-aniline or of quinonedichlorimide on certain phenols or phenol-carbonic acids in a hot alcoholic or acetic acid solution, or by oxidation of these phenols with paradiamines at a medium temperature. 

The dyestuffs from jS-naphthol and from gallic acid are best known. The former was discovered almost simultaneously by Witt and Meldola. 

The hydrochloride, Ci8Hi4,N20,HCl, and the zinc chloride double salt form bronzy needles, which form blue-violet solutions with water. 

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Wang, B.Q. and Dong, S.J. (2000) Sol-gel-derived amperometric biosensor for hydrogen peroxide based on methylene green incorporated in Nafion film. Talanta, 51, 565—572. 

C.H. Lei and J.Q. Deng, Hydrogen peroxide sensor based on coimmobilized methylene green and horseradish peroxidase in the same montonorillonite-modified bovine serum albumin-glutaraldehyde matrix on a glassy carbon electrode surface. Anal. Chem. 68, 3344—3349 (1996). 

B.H. Liu, F. Yan, J.L. Kong, and J.Q. Deng, A reagentless amperometric biosensor based on the coimmobilization of horseradish peroxidase and methylene green in a modified zeolite matrix. Anal. Chim. Acta 386, 31-39 (1999). 

A carbon felt electrode modified by electropolymer-ized methylene green has been implemented as the anode in an alcohol—O2 biofuel cell. The porous... 

Ulyanova YV, Blackwell AE, Minteer SD. Poly(methylene green) employed as molecularly imprinted polymer matrix for electrochemical sensing. Analyst 2006 131 257-261. 

A few nitro derivatives of methylene blue have been described. By introducing one nitro group under mild conditions (nitric acid of ca. 20% and sodium nitrite) methylene green was obtained [85]. 

Methylene Green [2679-01-8] M 364.9. Crystd three times from water (18ml/g). 

Methylene green, azine green. Celestine blue, coreine jR, ultra cyanine, modem cyanine, phenocyanme, chroinocyanine. mi ... 

Methylene green, Capn green, azme green, fast green M, etc ] Decolorised Original colour returns on exposure to air A tine Oxazine or Thtaztne Class... 

Fast green M. methylene green, azine green, Capri green, etc. N De. colonsed Colour returns on exposure to air Azute, 0 xaztne, or Thtaztne Class... 

The photochemical dechlorination of 4-chlorobiphenyl in the presence of anthracene and triethylamine is supposed to proceed via two electron transfer steps, first from triethylamine to excited anthracene and then from the anthracene radical anion to the aryl halide410. This type of mechanism is also operative in the dechlorination of 4-chlorobiphenyl, 4,4 -dichlorobiphenyl, 1,3,5-trichlorobenzene, 1,2,3,5-tetrachloroben-zene and pentachlorobenzene photosensitized by visible dyes (protoporphyrin IX, acriflavin, rose bengal, zinc protoporphyrin, methylene green) in the presence of triethylamine411. The various steps of the mechanism are summarized in equations 112-115. A mechanistic alternative is that the excited photosensitizer transfers an electron directly to the aryl chloride and becomes regenerated by electron transfer from the amine. 

Methylene blue and methylene green are diluted with dextrin since the use of salts greatly decreases their solubility. Methylene green is used chiefly for producing black shades on silk, in combination with logwood-iron mordants and also with tin phosphate. The shades produced in this way are the most brilliant and fast blacks for sim. 

Methylene Green (mol. wt. 364.6). Methylene Green is a nitro methylene blue and its reduction requires 6 equivalents of iron. Therefore,. cc. titanium trichloride solution is equivalent to ... 

Methylene green, the nitro derivative of methylene blue, is an interesting dye. The nitration is effected in the same way as that of tropaeo-line, using the crude zinc chloride double salt without further treatment. 

Modified electrodes for this analytical purpose have mostly been formed by electrode adsorption of the mediator systems on the electrode surface or by electropolymerization [24,116]. Recently, for example, NAD(P)H oxidations have been performed on platinum or gold electrodes modified with a monolayer of pyrroloquinoline quinone (PQQ) [117] or on poly(methylene blue)-modified electrodes with different dehydrogenases entrapped in a Nafion film for the amperometric detection of glucose, lactate, malate, or ethanol [118]. In another approach, carbon paste electrodes doped with methylene green or meldola blue together with diaphorase were used for the NADH oxidation [119]. A poly(3-methylthio-phene) conducting polymer electrode was efficient for the oxidation of NADH [120]. By electropolymerization of poly(aniline) in the presence of poly(vinylsulfonate) counterions. 

Methylene Green New Methylene Blue H New Methylene Blue A... 

The azine basic dyes are often applied in the spectropholometric methods. Methylene Blue (formula 48.1) and Methylene Green are thiazine dyes. 

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