Heavy-oxygen water

• CAS: 14314-42-2
• Catalog Number: ACM14314422
• Category: Main Products
• Molecular Weight: 20.02
• Molecular Formula: H₂O
• Synonyms: water-(18)o(normalized);WATER-18O;Water-18O ;DEUTERIUM OXIDE-18O (UNNORMALIZED WATER-;WATER-18O, NORMALIZED, 99 ATOM % 18O;WATER-(18)O (NORMALIZED)VIAL WITH 1 G;WATER-18O, 97 ATOM % 18O;WATER-18O, NORMALIZED, CA. 10 ATOM % 18O
• IUPAC Name: oxidane
• Canonical SMILES: O
• InChI Key: XLYOFNOQVPJJNP-NJFSPNSNSA-N
• Boiling Point: 100°C(lit.)
• Melting Point: 0°C(lit.)
• Density: 1.11g/mL at 20°C(lit.)
• Appearance: liquid
• Exact Mass: 20.01480

Case Study

Dielectric Relaxation Dynamics of Light Water, Heavy Water and Heavy Oxygen Water

Kutus, Bence, et al. Physical Chemistry Chemical Physics, 2021, 23(9), 5467-5473.

Isotope substitution has a great influence on the dielectric relaxation dynamics of hydrogen-bonded liquid water. This work studies the dielectric relaxation of light water (H₂¹⁶O), heavy water (D₂¹⁶O) and heavy oxygen water (H₂¹⁸O) in the temperature range of 278 to 338 K. Important conclusions include:
· Upon H/D exchange, it was observed a 20-35% increase in the corresponding relaxation time, while the substitution of ¹⁶O with ¹⁸O leads to a significantly smaller slow-down in dynamics, approximately 4-5%. When analyzing the thermal activation of relaxation using the extended Eyring theory, it can be found that the activation parameters for H₂¹⁶O and H₂¹⁸O are nearly identical.
· The increase in the relaxation time for H₂¹⁸O compared to H₂¹⁶O appears to be independent of temperature, indicating that the isotope effect is primarily influenced by classical mass effects that do not rely on temperature. The enhancement observed with ¹⁶O/¹⁸O substitution can be accurately described by the translational mass factor, even though the dipolar relaxation of water is inherently rotational, which would typically suggest that moments of inertia should dictate the relaxation time. The rise in relaxation time correlates with an increase in viscosity, implying that the deceleration of relaxation dynamics in H₂¹⁸O is driven by greater viscous friction.
· In contrast, the increase in relaxation time due to H/D exchange is significantly more pronounced and displays a strong dependence on temperature. Nonetheless, when scaling the relaxation times of D₂¹⁶O with the translational mass factor and adjusting for nuclear quantum effects with a corresponding temperature shift, these values align with those of H₂¹⁶O.

Effects of Deuterated Water and Heavy-Oxygen Water on Kinesin-1 Sliding Test

Maloney, Andy, et al. PeerJ, 2014, 2, e284.

This work studied the effects of deuterated water (²H₂O) and heavy-oxygen water (H₂¹⁸O) on the sliding speed of microtubules on kinesin-1 coated surfaces. It was found that an increase in the fraction of isotopic water used in the motility solution led to a decrease in the sliding speed of microtubules. These findings suggest that water isotopes appear to be an effective experimental knob for studying the effects of water on kinesin activity.
For each data point, several hundred microtubules were monitored at a stable temperature of 33.1 ± 0.1 °C. In the heavy-hydrogen water experiment, the calculated speed with 100% light water was 1016 ± 11 nm/s, whereas in the heavy-oxygen water experiment, it was recorded at 1007 ± 4 nm/s. An increase in either the heavy-hydrogen water buffer or the heavy-oxygen water buffer in the motility solution led to a linear decline in the estimated speed measurements.
At the highest concentration of the heavy-hydrogen water buffer tested, the estimated gliding speed dropped to 799 ± 8 nm/s, whereas the heavy-oxygen water buffer yielded a speed of 954 ± 16 nm/s. When compared to the light water buffer, the speed reduction for the heavy-hydrogen water was around 21%, and for the heavy-oxygen water, it was approximately 5%. This analysis also incorporates data from the deuterium-depleted light water buffer, which recorded a most probable speed of 1015 ± 4 nm/s.

Custom Q&A

What is the molecular formula of heavy-oxygen water?

The molecular formula of heavy-oxygen water is H2O.

What are some synonyms of heavy-oxygen water?

Some synonyms of heavy-oxygen water are Water-18O, Oxygen-18, Water O-18.

What is the molecular weight of heavy-oxygen water?

The molecular weight of heavy-oxygen water is 20.015 g/mol.

When was heavy-oxygen water created?

Heavy-oxygen water was created on August 8, 2005.

What is the IUPAC name of heavy-oxygen water?

The IUPAC name of heavy-oxygen water is oxidane.

What is the InChI of heavy-oxygen water?

The InChI of heavy-oxygen water is InChI=1S/H2O/h1H2/i1+2.

What is the InChIKey of heavy-oxygen water?

The InChIKey of heavy-oxygen water is XLYOFNOQVPJJNP-NJFSPNSNSA-N.

What is the CAS number of heavy-oxygen water?

The CAS number of heavy-oxygen water is 14314-42-2.

What is the UNII of heavy-oxygen water?

The UNII of heavy-oxygen water is 7QV8F8BYNJ.

What is the molecular weight of heavy-oxygen water in terms of Computed Properties?

The molecular weight of heavy-oxygen water is 20.015 g/mol (computed by PubChem 2.1).