Some tetrazolium salts and their ion-association complexes with the molybdenum(VI) — 4-nitrocatechol anionic chelate: DTA and TGA study

• Published in: Journal of thermal analysis and calorimetry 2009-04, Vol.96 (1), p.249-254
• Main Authors: Gavazov, K., Lekova, V., Boyanov, B., Dimitrov, A.
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Coordination compounds; Exact sciences and technology; Inorganic Chemistry; Inorganic chemistry and origins of life; Measurement Science and Instrumentation; Physical Chemistry; Polymer Sciences; Preparations and properties; Regular Papers
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-008-9421-4

Several commercially available 2H-tetrazolium salts (TS) {2,3,5-triphenyl-2H-tetrazolium chloride (TTC), 3-(1-naphthyl)-2,5-diphenyl- 2H-tetrazolium chloride (Tetrazolium Violet, TV), 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT), 2-(4-iodophenyl)-3-(4-nitrophenyl)-5-phenyl-2H-tetrazolium chloride (INT) and 3,3′-(3,3′-dimethoxy-4,4′-biphenylene)-bis(2,5-diphenyl- 2H-tetrazolium) chloride (Tetrazolium Blue Chloride, BTC)} and their ion-associated complexes (IAC) with the Mo(VI) — 4-nitrochatechol (4-NC) anionic chelate [MoO 2 (4-NC) 2 ] 2− have been investigated by differential thermal analysis (DTA) and thermogravimetric analysis (TG). Some special features of the thermal behavior of the compounds have been discussed. The results show that the thermal stability of IAC depends on the factors determining the values of their association constants β: molecular mass and the presence of nitrophenyl substituent(s) in the tetrazolium ring.