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Spiropyran quiz #1
Can you answer these incredibly cool spiropyran-related questions?
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Last updated: November 5, 2023
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| First submitted | November 5, 2023 |
| Times taken | 3 |
| Average score | 50.0% | Report this quiz | Report |
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1.
In chemistry, what is a spiro-compound?
A molecule that contains a bend or twist in its structure.
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A molecule that has at least two rings sharing only one common atom.
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A molecule that structurally resembles Spyro the dragon.
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A molecule containing two ring systems that are orthogonal to each other.
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2.
When was 1,3,3-trimethyl-spiropyran (the "standard" spiropyran) first synthesised?
1940s.
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1950s.
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1960s.
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1970s.
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It was synthesised in 1940 by German chemists R. Wizinger and H. Wenning.
3.
Which of the following statements is false?
UV light generally facilitates SP -> MC conversion.
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Spiropyrans are not found in nature.
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Spiropyrans generally exhibit negative photochromism.
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Spiropyrans do not exhibit solvatochromism.
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Spiropyrans generally exhibit positive photochromism: λmax(GS) < λmax(ES).
4.
What is a current commercial use of spiropyran-based materials?
Colour-changing swimwear.
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Electro-optic data storage.
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Colorimetric humidity sensors in museums/galleries.
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Photochromic sunglasses.
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5.
Why does our group study spiropyrans?
For use in photoresponsive MOFs.
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Because they're colourful and nice to look at.
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They are decadent.
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We don't study them.
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6.
What is a major advantage of spiropyrans vs other photoswitches, such as azobenzenes and diarylethenes?
Large change in dipole moment upon photoconversion.
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Higher thermal stability.
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More easily synthesised.
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Resistant to photobleaching.
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μ(SP) ~ 4 D, μ(MC) ~ 17 D. Therefore, vastly different physicochemical properties.
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