Exploiting Mass Measurements in Different Environments: Density, Magnetic Susceptibility, and Thermogravimetry

Bower, Nathan W.; Yu, Anne

doi:10.1021/ed200074q

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…Finally, the setup for this experiment is simple to implement. It can be adapted to lower levels by shortening the characterization work or to the master level by adding quantitative magnetic measurements 27 or by extending the study to other related magnetic complexes.…”

Section: ■ Conclusionmentioning

confidence: 99%

Synthesis and Properties of a Thermochromic Spin Crossover Fe^II Complex: An Undergraduate Coordination Chemistry Laboratory Experiment

2013

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In this third-year undergraduate experiment, a coordination complex [Fe(NH 2 trz) 3 ]Br 2 •H 2 O (NH 2 trz is 4-amino-1,2,4-triazole, C 2 H 4 N 4 ) was synthesized and characterized by IR and UV−visible spectroscopies. This compound exhibits a spectacular reversible purple-white thermochromic transition upon heating−cooling with a large hysteresis centered at room temperature. The thermochromic transition is related to the spin crossover (SCO) from the low-spin state (LS, purple, S = 0, diamagnetic) to the high-spin state (HS, white, S = 2, paramagnetic). During this experiment, students discovered synthetic methods, such as anion metathesis and Ostwald ripening, and physical properties, such as magnetic properties, thermochromism, and bistability phenomenon, altogether leading to possible applications in optical-data storage and display.

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Section: ■ Conclusionmentioning

confidence: 99%

Synthesis and Properties of a Thermochromic Spin Crossover Fe^II Complex: An Undergraduate Coordination Chemistry Laboratory Experiment

2013

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“…Thermal analysis is a powerful tool in tracking solid-state reactions, , and it is widely used in undergraduate and graduate student laboratories. − The experimentally resolved shape of thermoanalytical curves recorded using thermogravimetry (TG) and differential scanning calorimetry (DSC) reveals kinetic information about reactions. For solid-state reactions, various kinetic calculation methods using the thermoanalytical measurements under linearly increasing temperatures have been proposed .…”

Section: Introductionmentioning

confidence: 99%

Physico-Geometrical Kinetics of Solid-State Reactions in an Undergraduate Thermal Analysis Laboratory

et al. 2013

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An undergraduate kinetic experiment of the thermal decomposition of solids by microscopic observation and thermal analysis was developed by investigating a suitable reaction, applicable techniques of thermal analysis and microscopic observation, and a reliable kinetic calculation method. The thermal decomposition of sodium hydrogen carbonate is selected as the suitable reaction for the student experiments, because its physico-geometrical reaction mechanism is approximately described by the twodimensional phase boundary controlled model, and its reaction kinetics are less sensitive to the measurement conditions of thermal analyses. On the basis of simple microscopic observations of this reaction, development of the physico-geometrical reaction model and derivation of the kinetic model function are imposed on students. The kinetic analysis is also performed using the kinetic rate data recorded by a single thermogravimetric run under modulated temperature conditions. This reduces the time spent in the laboratory and enables the application of a two-step kinetic calculation that provides reliable kinetic results. From the results, students can interpret the kinetics, which are closely related to the physico-geometrical characteristics of the reaction. A one-day undergraduate course in a thermal analysis laboratory is proposed from research and trials conducted in our university.

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Exploiting Mass Measurements in Different Environments: Density, Magnetic Susceptibility, and Thermogravimetry

Cited by 2 publications

References 13 publications

Synthesis and Properties of a Thermochromic Spin Crossover Fe^II Complex: An Undergraduate Coordination Chemistry Laboratory Experiment

Synthesis and Properties of a Thermochromic Spin Crossover Fe^II Complex: An Undergraduate Coordination Chemistry Laboratory Experiment

Physico-Geometrical Kinetics of Solid-State Reactions in an Undergraduate Thermal Analysis Laboratory

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Exploiting Mass Measurements in Different Environments: Density, Magnetic Susceptibility, and Thermogravimetry

Cited by 2 publications

References 13 publications

Synthesis and Properties of a Thermochromic Spin Crossover FeII Complex: An Undergraduate Coordination Chemistry Laboratory Experiment

Synthesis and Properties of a Thermochromic Spin Crossover FeII Complex: An Undergraduate Coordination Chemistry Laboratory Experiment

Physico-Geometrical Kinetics of Solid-State Reactions in an Undergraduate Thermal Analysis Laboratory

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Product

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Synthesis and Properties of a Thermochromic Spin Crossover Fe^II Complex: An Undergraduate Coordination Chemistry Laboratory Experiment

Synthesis and Properties of a Thermochromic Spin Crossover Fe^II Complex: An Undergraduate Coordination Chemistry Laboratory Experiment