A New pH Indicator Based on 2,5‐Diaryl‐1‐salicylideneamino‐1,3,4‐triazole Derivative |
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Authors: | Ali GUNDOGDU Volkan N BULUT Celal DURAN Baris KEMER Olcay BEKIRCAN Mustafa SOYLAK |
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Institution: | 1. Department of Chemistry, Faculty of Arts & Sciences, Karadeniz Technical University, Trabzon 61080, Turkey;2. Department of Chemistry, Giresun Faculty of Arts & Sciences, Karadeniz Technical University, Giresun 28049, Turkey;3. Tel/Fax: 0090‐352‐4374933 |
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Abstract: | 2‐Phenyl‐5‐p‐tolyl‐1‐salicylideneamino‐1,3,4‐triazole (PTST) was studied among 2,5‐diaryl‐1‐salicylidene amino‐1,3,4‐triazole derivatives as a novel potential pH indicator. In terms of absorption intensity coming from the acid‐base reactions, PTST showed strong yellow‐green colour with high extinction coefficient in the pH range 7.0–9.5. In addition, the corresponding colour development at the transition point can be attributed to the resonance structures of PTST, which were caused by the hydrogen ion dissociation from the acidic form of the compound in the presence of alkali. The full geometric optimization and achievement of the electronic structure of the molecule were performed by an AM1 semiempirical method. The triazole compound was compared with phenolphthalein (PT), which is widely used as an acid‐base indicator in titrimetry, for accuracy test. |
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Keywords: | 2‐phenyl‐5‐p‐tolyl‐1‐salicylideneamino‐1 3 4‐triazole pH indicator transition point UV‐Vis spectroscopy resonance |
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