Structural studies on 3-acetyl-1,5-diaryl and 3-cyano-1,5-diaryl formazan chelates with cerium(III), thorium(IV) and uranium(VI)

Synthesis of Metal Complexes of Some Formazans Obtaining From Cinnamaldehyde and Investigation of Their Dyeing Properties Using Different Methods

“…This proves that OH group takes part in the formation of C-O-M bond. These results are in good accordance with the literature [5,8,11,26] and confirm the structure given in Scheme1. Some, other aromatic C-H, SO2, S-O stretching peaks and -C-O-M vibration band in the compounds were observed in their expected regions.…”

“…The fastness values were determined according to the International Standards; the specific tests used were ISO 105 C06/C1S (washing fastness), ISO 105X12 (treatment fastness) and ISO 105 B02 (light fastness). The light fastness tests were assessed according to the international blue scale (1)(2)(3)(4)(5)(6)(7)(8), the treatment and washing fastness tests were assessed according to the international grey scale (1-5), with scales 8 and 5, respectively, to find the best rank, while scale 1 was the most inferior. All fastness values of dyes were depicted in the Table 5.…”

“…Formazans forms complexes with a variety of metal ions. These complexes are formed by coordinating metal atom to 1 and 5 positions of the formazans [5][6][7][8][9][10][11][12][13]. The metal complexes of formazans are used widely on textile substrates since they provide shades of high fastness to light, They are also used in paint industries [14][15][16][17].…”

Sensitivity of Isomerization Kinetics of 1,3,5-Triphenylformazan on Cosolvents Added to Toluene

“…Formazans have the general formula R 1 –NH–NCR 2 –NN–R 3 , bearing both a hydrazone and an azo group and commonly exhibiting intense colors. They have synthetic applications, such as in the production of open-shell verdazyl compounds − or as versatile formazanate ligands in organometallic complexes. − Formazans can be obtained by the reductive reaction of the corresponding, usually colorless, tetrazolium salt, which is accompanied by a distinct color change. This chromogenic reaction has numerous applications, for example, using the enzymatic reduction of tetrazolium salts to formazans in biological assays to indicate cellular respiration and cell growth, − in agriculture to examine the germinability of seeds, , in chromatographic sugar determination, and in medicine, especially in cancer research, − or most recently the oxidation of amino acids by excited tetrazolium salts. , …”