"Pharaoh's Snakes" - History of a Fun Pyrotechnical Experiment and Its Applicability in Teaching Basic Chemical Principles

Ullmann, Marcius A.; Wallau, W. Martin; Bianchini, Daniela; Schneid, Andressa da Cruz; Montenegro, Lara M. P.

doi:10.5935/0100-4042.20140176

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“…22,23 Some chemical reactions with color changes or bubbles are suitable for chemical education as they are visible to the naked eye, such as the Briggs−Rauscher reaction, 24 the Elephant's toothpaste reaction that produces a tower of foam, 25 and the Pharaoh's snake reaction. 26 However, for many reactions, we cannot directly tell with naked eyes whether a reaction occurs or estimate the selectivity and how much of the reaction proceeds at a given time. Various auxiliary instruments, such as nuclear magnetic resonance spectroscopy and infrared spectroscopy (IR), or indirect ways can be used to monitor reactions.…”

Section: Introductionmentioning

confidence: 99%

Visible and selective gel assembly via covalent click chemistry

Zheng,

2023

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This study marks the birth of visible and selective click covalent assembly. It is achieved by amplifying orthogonal alkyne−azide click chemistry through interfacial multisite interactions between azide/alkyne functionalized polymer hydrogels. Macroscopic assembly of hydrogels via host−guest chemistry or noncovalent interactions such as electrostatic interactions has been reported. Unlike macroscopic supramolecular assembly, here we report visible and selective “click” covalent assembly of hydrogels at the macroscale. LEGO‐like hydrogels modified with alkyne and azide groups, respectively, can click together via the formation of covalent bonds. Monomer concentration‐dependent assembly and selective covalent assembly have been studied. Notably, macroscopic gel assembly clearly elucidates click preferences and component selectivity not observed in the solution reactions of competing monomers.

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Section: Introductionmentioning

confidence: 99%

Visible and selective gel assembly via covalent click chemistry

Zheng,

2023

SmartMat

View full text Add to dashboard Cite

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"Pharaoh's Snakes" - History of a Fun Pyrotechnical Experiment and Its Applicability in Teaching Basic Chemical Principles

Cited by 1 publication

References 0 publications

Visible and selective gel assembly via covalent click chemistry

Visible and selective gel assembly via covalent click chemistry

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