This research aims to develop students' creative thinking skills. This study used a classroom research method with a one-shot case study design. The sample in this study were students of environmental chemistry at the Chemistry Education Study Program, FKIP UNRAM. Observation data will be obtained based on observation sheets to describe student activities and creativity from the beginning of the project to the end of the project. The project that is given focuses on environmental pollution material. The results of this study indicate that students are very active in the project-based learning process. Students' creative thinking skills in designing simple experiments about environmental pollution are in a good and very good position. The generating stage with a value of 90 (very good), the planning stage with a value of 88 (very good), the producing / producing stage is very good (88), the checking stage 80 is good, and the critiquing stage with a value (Good).
A novel fluorescent sensor 4-(1H-benzimidazol-2-yl)-2-methoxy-phenol derivative was synthesized. Solution of 4-(1H-benzimidazol-2-yl)-2-methoxy-phenol (1 × 10 -7 M) in DMSO displays highly sensitives and rapid respons to CN -ion [values of LOD = 1.8 × 10 -6 M and Ka = 2.5 (± 0.26) × 10 6 M -1 ]. Sensor 4-(1H-benzimidazol-2-yl)-2-methoxy-phenol coordinated with CN -ion form with a 1:1 binding stoichiometry.
The efficiency of ethyl-p-methoxycinnamate(EPE) and its derivatives as corrosion inhibitors of iron in acid environment has been studied to find the relationship between molecular structure and electronic parameters with their efficiency of corrosion inhibition. The ab initio MP2 perturbation theory and DFT method were applied to calculate molecular structure and electronic parameters of inhibitors. Computational and experimental corrosion inhibition efficiency show that the electronic properties of molecules, including the orbital molecular frontier energy (HOMO and LUMO energy), ionization potential, electron affinity, electronegativity, number of electron transfer from inhibitor to metal and interaction energy have a strong relationship with inhibition performance. Interaction mechanism obtained from natural bond orbital analysis was employed to study the interactions between inhibitors with iron metal in more detail. The presence of electron donor groups within the frameworks of inhibitors has a less significant effect compared to π-electron contribution on corrosion inhibition performance.
Two new receptors S2 and S6 were designed and synthesized based on benzimidazole and azobenzimidazole synthesized from vanillin for the colorimetric detection of fluoride ion. The presence of nitro group in S2 and azo in S6 makes -OH proton (binding site) acidic and therefore it could deprotonate with addition of basic anion such as fluoride. Hydroxyl (OH) functionality which detects basic fluoride ions via hydrogen-bonding mechanism which is mechanism involved in the color change of receptor R2 and R6, its mean that initial hydrogen bond formation of F − ion with -OH group.
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