Re: pinhole hydrogen bonding

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From: Karen Kalumuck (karenk@exploratorium.edu)
Date: Tue Jan 30 2001 - 10:33:20 PST 

Message-Id: <v01540b01b69cb931a966@[192.174.2.182]>
Date: Tue, 30 Jan 2001 10:33:20 -0800
From: karenk@exploratorium.edu (Karen Kalumuck)
Subject: Re: pinhole hydrogen bonding

Regarding the hydrogen bonding issue:

Cl is not too big for H-bonding. It's ionic radius is 1.81 angstroms while
that of nitrogen (which
undergoes extensive H-bonding, e.g., the alpha helix) is 1.71 angstroms. That's
not a big prohibitively big difference in size to rule out H-bonding.

---Karen K

>Hi Geoff,
>Chlorine is too big. The atoms that hydrogen bond must be small and have high
>electronegativity. Actually there may be weak hydrogen bonding in HCl. Its
>boiling point is a little higher than would be expected from the B.P.s of HBr
>and HI.
>Neil Fetter
>
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Karen E. Kalumuck, Ph.D.
Biologist
Exploratorium Teacher Institute
3601 Lyon St.
San Francisco, CA 94123
415-561-0388
karenk@exploratorium.edu

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