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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 | 6 |
| Average score | 83.3% | 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.
A molecule that has at least two rings sharing only one common atom.
A molecule that structurally resembles Spyro the dragon.
A molecule containing two ring systems that are orthogonal to each other.
2. When was 1,3,3-trimethyl-spiropyran (the "standard" spiropyran) first synthesised?
It was synthesised in 1940 by German chemists R. Wizinger and H. Wenning.
1940s.
1950s.
1960s.
1970s.
3. Which of the following statements is false?
Spiropyrans generally exhibit positive photochromism: λmax(GS) < λmax(ES).
UV light generally facilitates SP -> MC conversion.
Spiropyrans are not found in nature.
Spiropyrans generally exhibit negative photochromism.
Spiropyrans do not exhibit solvatochromism.
4. What is a current commercial use of spiropyran-based materials?
Colour-changing swimwear.
Electro-optic data storage.
Colorimetric humidity sensors in museums/galleries.
Photochromic sunglasses.
5. Why does our group study spiropyrans?
For use in photoresponsive MOFs.
Because they're colourful and nice to look at.
They are decadent.
We don't study them.
6. What is a major advantage of spiropyrans vs other photoswitches, such as azobenzenes and diarylethenes?
μ(SP) ~ 4 D, μ(MC) ~ 17 D. Therefore, vastly different physicochemical properties.
Large change in dipole moment upon photoconversion.
Higher thermal stability.
More easily synthesised.
Resistant to photobleaching.
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