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Water molecules switch hydrogen-bond partners through a brief rearrangement: a water molecule is bonded to one neighbour, rotates as that interaction breaks, and forms a bond with another. In a 2010 experiment on water containing sodium perchlorate, researchers reported an average of about 6 picoseconds with a particular partner, while the bond-breaking and bond-forming interval was about 50 femtoseconds. The rotation associated with taking up a new partner was inferred to be about 50 degrees. These figures describe that specific solution and experiment, not every hydrogen-bonding liquid.
What “partner swapping” means
A hydrogen bond is an interaction between molecules or molecular groups; in this experiment, the team distinguished water molecules bonded to other water molecules from those bonded to perchlorate anions dissolved in the solution. Partner swapping is the transition from one such interaction to another. It is not the same as saying the molecule spends only a few femtoseconds with a partner: the reported partner residence time and the exchange interval describe different parts of the process.
- A water molecule is hydrogen-bonded to a particular neighbour.
- The interaction gives way as the molecule moves.
- The water molecule rapidly reorients, and a hydrogen bond forms with a different partner.
How the experiment detected the change
In a study reported by Chemistry World on 21 May 2010, Kelly Gaffney and colleagues at Stanford University studied an aqueous sodium perchlorate solution. They excited O–H bonds with laser energy and measured their vibrations. Because hydrogen bonding shifts an O–H vibrational frequency, the signal could distinguish water bonded to water from water bonded to a perchlorate anion.
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The researchers used absorption measurements at very short time intervals to follow those signals. They also used polarized light and two lasers to infer the amount of rotation associated with forming a new partner interaction. Thus, the reported rotation was inferred from the optical measurements; it was not a direct observation of a molecule turning in a photograph or video.
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What the three reported numbers mean
| Reported value | What it describes | Scope |
|---|---|---|
| About 6 picoseconds | Average time a water molecule remained hydrogen-bonded to a particular partner | Reported by Chemistry World for the aqueous sodium perchlorate study |
| About 50 femtoseconds | Interval to break one hydrogen bond and form another | Reported by Chemistry World for the same study |
| About 50 degrees | Rotation associated with engaging a new partner | Inferred from polarized-light measurements and reported by Chemistry World |
A picosecond is one trillionth of a second; a femtosecond is one quadrillionth. The reported exchange interval is therefore much shorter than the average time associated with a particular partner. The numbers should not be treated as universal constants: they belong to the solution and measurement described in the report.
Why the result matters
Hydrogen-bond networks continually reorganize, but the motion involved in an exchange had been difficult to observe directly. The study provided experimental evidence relevant to theoretical predictions of hydrogen-bond dynamics in aqueous systems. Its central picture is a rapid reorientation as one bond gives way and another forms, rather than a slow, smooth turn.
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Gaffney described the motion this way: “In other words the molecule makes a hydrogen bond with one partner, then very quickly rotates about 50° to exchange with another partner.” Chemistry World also quoted solvation researcher Andrew Ellis, who characterized the detaching O–H group as swinging around “propeller-like” before forming a new hydrogen bond with a neighbouring molecule.
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The cited news report summarizes the experiment and identifies the paper as M. Ji, M. Odelius and K. J. Gaffney, Science 328, 1003 (2010), DOI 10.1126/science.1187707. The report does not provide the full experimental protocol, uncertainty estimates, or instrument models, so those details cannot be inferred from its summary. Nor does one experiment in aqueous sodium perchlorate establish the same times or rotation for pure water or other molecular environments.
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