Über Formazylkomplexe

Wizinger, R.; Bíró, Vivien

doi:10.1002/hlca.19490320334

Cited by 56 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The silver salt of 3-benzoyl-l,5-diphenylformazan (table 13) is very unstable (27, 28). The copper salts of formazans whose V-phenyl rings carry hydroxyl or carboxyl groups in the ortho position are particularly stable (56,168,199,201); they are not hydrolyzed by acids and have been used for dyeing. The stability of this class of complex can be attributed to chelation involving the hydroxylic ortho substituents.…”

Section: Physical Properties Of Formazansmentioning

confidence: 99%

The Chemistry of Formazans and Tetrazolium Salts

Nineham¹

1955

Chem. Rev.

290

188

View full text Add to dashboard Cite

Section: Physical Properties Of Formazansmentioning

confidence: 99%

The Chemistry of Formazans and Tetrazolium Salts

Nineham¹

1955

Chem. Rev.

290

188

View full text Add to dashboard Cite

“…Various colored nietal complexes with formazyl coinpounds have been described (1,4,(9)(10)(11). The only mention of compounds of this type as colorimetric reagents is in a note by i$'izinger (9).…”

mentioning

confidence: 98%

Colorimetric Determination of Zinc and Copper with 2-Carboxy-2´-hydroxy-5´-sulfoformazylbenzene

Rush¹,

Yoe²

1954

Anal. Chem.

174

View full text Add to dashboard Cite

The purpose of this investigation was to develop a new colorimetric method for zinc and copper utilizing the compound 2-carboxy-2'-hydroxy-5'-sulfoformazylbenzene (Zincon). Both elements form a blue complex with this reagent. The zinc complex is stable over the pH range 8.5 to 9.5 while the copper complex is stable in the pH range 5.0 to 9.5. This difference in effect of pH permits the determination of zinc and copper in the presence of each other. Both complexes follow Beer's law over the concentration range 0.1 to 2.4 p.p.m. of the element. The sensiti\ity is 0.003 y per sq. cm. for both zinc and copper. A n ion exchange procedure is described for the separation of zinc from interfering ions.URISG an investigation of a numbcr 01 organic coni-D pounds, selected as possible analytical reagents because of their structure, the compound 2-carboxy-2'-hydroxy-5'-sulfoformazylbenzene ( I ) was observed to give a dark blue precipitate (blue solution at high dilution) with zinc and color reactions with copper, cobalt, and nickel. These observations prompted an investigation of this compound as a possible eolorimctric reagent for zinc and copper. . 4 brief discussion of the color formation with zinc has already been presented (13). 1Various colored nietal complexes with formazyl coinpounds have been described (1,4,(9)(10)(11). The only mention of compounds of this type as colorimetric reagents is in a note by i$'izinger (9).At present, the most widely uscd colorimetric method for zinc is the one employing dithizone which has a sensitivity of 0.0016 y per sq. cm. (7). The new method has a sensitivity of 0.003 -/ per sq. em. and replaces the complexing and extraction of the dithizone method with an ion exchange separation.Zincon is proposed as a short name for the compound 2-caiboxy-2'-hydroxy-5'-sulfoformazylbenzene. According to Chenizcal Abstracts' nomenclature the name is 0-( 2-1 ~(2-hydroxy-jsulfopheny1azo)-benz ylidene] hydrazino 1 benzoic acid. APPAR4TUS AND REAGENTS9 Beckman spectrophotometer, Model DU, operated at maximum sensitivity, was used for all absorbance measurements. The ultraviolet-sensitive phototube was employed at and below 625 mp. Matched 1.00-em. Corex cells were used. A Beckman pH meter, Model G, was employed for all pH measurements.Both the straight-and goose-neck type of ion exchange columns were used. The tube containing the resin was a 7-cm. length of borosilicate glass tubing, 5 mm. inside diameter, in both cases.

show abstract

“…With the structural data shown above, it was established that both 4-and 5-membered chelate rings are possible upon coordination of the formazanate NNCNN-framework to alkali metal cations. The recent work by Hicks and co-workers 18,27,28 and our group 8,9 and some previous examples of metal form-azanate complexes [29][30][31][32][33][34] show that in most of the cases a 6-membered chelation mode analogous to that observed for β-diketiminate complexes is preferred, but this apparently is not favourable for very ionic compounds as described here. We became interested in the structure of formazanate anions devoid of a coordinating metal cation.…”

Section: Solid-state Structuresmentioning

confidence: 56%

Alkali metal salts of formazanate ligands: diverse coordination modes as a result of the nitrogen-rich [NNCNN] ligand backbone

2014

View full text Add to dashboard Cite

Alkali metal salts of redox-active formazanate ligands were prepared, and their structures in the solid-state and in solution are determined. The nitrogen-rich [NNCNN] backbone of formazanates results in a varied coordination chemistry, with both the internal and terminal nitrogen atoms available for bonding with the alkali metal. The potassium salt K[PhNNC(p-tol)NNPh]·2THF (1-K) is dimeric in the solid state and even in THF solution, as a result of the K atom bridging via interaction with a terminal N atom and the aromatic ring of a second unit. Conversely, for the compounds Na[MesNNC(CN)NNMes]·2THF (2-Na) and Na[PhNNC((t)Bu)NNPh] (3-Na) polymeric and hexameric structures are found in the solid state respectively. The preference for binding the alkali metal through internal N atoms (1-K and 2-Na) to give a 4-membered chelate, or via internal/external N atoms (5-membered chelate in 3-Na), contrasts with the 6-membered chelate mode observed in our recently reported formazanate zinc complexes.

show abstract

Über Formazylkomplexe

Cited by 56 publications

References 0 publications

The Chemistry of Formazans and Tetrazolium Salts

The Chemistry of Formazans and Tetrazolium Salts

Colorimetric Determination of Zinc and Copper with 2-Carboxy-2´-hydroxy-5´-sulfoformazylbenzene

Alkali metal salts of formazanate ligands: diverse coordination modes as a result of the nitrogen-rich [NNCNN] ligand backbone

Contact Info

Product

Resources

About