Property talk:P6272
Documentation
angle through which plane-polarized light is rotated by an optically active substance or a solution of that substance
Represents | specific rotation (Q2191631) | |||||||||
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Data type | Quantity | |||||||||
Domain | chemical substance (Q79529) | |||||||||
Allowed units | degree (Q28390) or degree square decimetre per kilogram (Q117188852) | |||||||||
Example | dolabriferol B (Q57421096) → −51.9 degree (−)-dolabriferol (Q44293768) → −53 degree | |||||||||
See also | refractive index (P1109) | |||||||||
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Proposal discussion | Proposal discussion | |||||||||
Current uses |
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Units
editIn chemistry the most common unit is degree square decimetre per kilogram (Q117188852). Although it is often shortened to just "degree", it is not at all the simple degree (Q28390), which should be removed from allowed units.
The main SI unit is radian square metre per kilogram (Q96347983) or square metre per kilogram (Q86200529).
Maybe molar units, e.g. radian square metre per mole (Q96347486), could be allowed as well, although molar optical rotatory power (Q96346994) is a different quantity formally. This would allow us to include such values without conversion. — Petr Matas 20:17, 20 March 2023 (UTC)
Concentration
editAlthough the quantity angle of optical rotation (Q96323385) is proportional to concentration (in terms of mass per volume), specific rotation (Q2191631) is independent of it (at least for small concentrations). Therefore the qualifier concentration (P6274) should not be mandatory. — Petr Matas 20:28, 20 March 2023 (UTC)