2.4.6- Tripyridyl-1,3,5-triazine

Tripyridyl triazine [3682-35-7] M 312.3, m 245-248 . Purified by repeated crystn from aq EtOH. 

Terpyridine (terpy) TriPyridyl-TriaZine (TPTZ) 2-amino-4,6-di- (pyridine-2-yl)-l,3>5-triazine (ADPTZ) 2,6-bis-(benzoxazolyl)-4- pyridine... 

Tripyridyl triazine [3682-35-7] M 312.3, m 245-248 . Purified by repeated crystn from aq EtOH. Tris-(2-aminoethyl)amine (TREN) [4097-89-6] M 146.2, b 114 /15mm, 263 /744mm, d... 

Polytopic nitrogen ligands such as tripyridyl-triazine, non-covalently finked multi-pyridyl ligands via bipy-metal interactions or buUt up through dendritic cores, were used for the formation of higher-ordered architectures. Several examples shall be presented here to demonstrate the utility of these poly topic ligands for the assembly of metalloporphyrins. 

Li S, Zhang L, Liu H, Pan M, Zan L, Zhang J. Heat-treated cobalt—tripyridyl triazine (Co—TPTZ) electrocatalysts for oxygen reduction reaction in acidic medium. Electrochim Acta 2010 55 4403-11. 

Bezerra CWB, Zhang L, Lee K, Liu H, Zhang J, Shi Z, et al. Novel carbon-supported Fe—N electrocatalysts synthesized through heat treatment of iron tripyridyl triazine complexes for the PEM fuel cell oxygen reduction reaction. Electrochim Acta 2008 53 7703-10. 

Self-assembled hexanuclear arene ruthenium metallo-prisms with 2,4,6-tripyridyl-l,3,5-triazine (ppt) subunits showed unexpected double helical chirality <06CC4691>. 

H. Diehl and G. F. Smith, The Iron Reagents — Bathophenanthroline, Batho-phenanthroline Sulphonic Acid, 2,4,6-Tripyridyl-s-triazine, Phenyl-2-pyridyl Ketox-ime. Smith Chem. Co., Columbus, Ohio, 1965. 

Iron. Excess iron in wines causes cloudiness, interferes with the color, and can impair flavor. The mechanism of ferric phosphate precipitation has been intensively studied, and numerous colorimetric methods have been developed. For routine purposes the color developed with thiocyanate is adequate (6,9), but many enologists prefer the orthophenanthro-line procedures (3, 4, 6, 22). Meredith et al. (Ill) obtained essentially the same results for iron using 2,4,6-tripyridyl-s-triazine (TPTZ) to develop the color. Atomic absorption spectrophotometry can be used but, as with copper, corrections for reducing sugar and ethanol are necessary (51). 

Melarsen (211) is active against both early and late stages of African trypanosomiasis. The antimony derivative (212) is used similarly (B-61MI22000, p. 715). 2,4,6-Tripyridyl-l,3,5-triazine forms a purple bis(triazinyl) complex with iron(III) ions which provides a spec-trophotometric method for estimating iron in wines (59MI22001). 

Dozens of compounds with the so-called ferroin-specific grouping N=C—C=N incorporated in pyridine, quinoline, benzimidazole, benzoxazole, etc. have been investigated and the most sensitive reagents for iron(II) are 2,4,6-tripyridyl derivatives of 1,3,5-triazine (43), the complexes of which have values of emax = 2260 (R = H), 2440 (R = Et) and 2520 mol m 2(R = Ph). The whole field has been exhaustively reviewed.79 80... 

EDTA was determined in the urine of patients treated with Na2CaEDTA upon formation of its Fe(II) complex with 2,4,6-tripyridyl-s-triazine at pH 4.5 [30], Concentrations ranging from 0.1-15.7 pM of EDTA in urine could be accurately determined. EDTA can be standardized by spectrophotometric titration with electrolytically pure Cu(II) at pH 5 without an indicator [31]. The break of the titration curve obtained at 700 nm is used as the end-point of the titration. 

Fig. 1 Schematic representation of procedures to obtain different types of particulate carbohydrates from Phaeocystis cells concentrated on a filter. Total carbohydrates can directly be quantified colorimetrically. Water-soluble carbohydrates are typically extracted in hot water. They can be quantified colorimetrically. The 2,4,6-tripyridyl-s-triazine (TPTZ)-analysis (Myklestad et al. 1997) discriminates monosaccharides from larger carbohydrates. The...

The tripyridyl-s-triazine ligand (49) is also tridentate and forms a very stable low-spin bis complex with iron(II) for which log /J2 = 11.05 at 23 °C (ref. 594a). It proved possible to separate the stepwise... 

Iron(II) in sea water forms complexes with 2,4,6-tripyridyl-sym-triazine or 4,7-diphenyl- 1,10-phenanthroline which are readily extracted with propylene carbonate (4-methyl-l,3-dioxolane-2-one). This extractant is colorless, nonhygroscopic, chemically stable, and more dense than water, but slightly soluble therein. Prior to complexa-tion the iron(III) has to be reduced to its divalent state by adding hydroxylammo-nium hydrochloride 67). 

Usual method it is colorimetrically measured on the H202 oxidized sample after reaction with an ortophenantroline reagent. Method II the content of iron is measured after reaction with 2,4,6-tripyridyl-s-triazine with a spectrophotometer at 593 nm. 

Hemoglobin was determined by the absorbance at 540 a of a 1 200 dilution of blood with 0.4% ammonium hydroxide. An electronic counter (Coulter) was used to determine the red cell counts In different parts of this work, the liver iron was determined spectrographically, with the ferrozine method (2) or with the use of 2,4,6-tripyridyl-l,3,5-triazine (10). Further experimental details, including identity of cereals involved, can be found in the initial reports (1, 3, 5 y 6, T). 

Many other titrating reagents have been used or described such as iron(iii) when the endpoint is detected using ferrozine, a,a -dipyridine, or 2,4,6,-tripyridyl-j -triazine as indicator (Figure 7.2). 

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