From: Richard Prankerd (richard.prankerd$##$vcp.monash.edu)
Date: Wed Sep 11 2002 - 17:49:23 EDT
Jim and all:
Your last statement/query is the most important one - once a solid is
dissolved COMPLETELY to make a solution, there is NO memory of what the
solid used to look like. Polymorphism of solids is irrelevant after the
solid is dissolved.
In point of fact there are three polymorphs of glycine. See the Merck Index
entry for glycine for a reference.
Polymorphs do have different IR spectra, because the different arrangements
of the molecules in the unit cell for each of the three polymorphs will
induce shifts in the vibrational frequencies of the bonds through the
different intermolecular forces that result from these arrangements. This
can change the frequencies and intensities (or even the existence) of
characteristic bands, especially those that are involved in groups which
form hydrogen bonds in the crystal structure. Carbonyl, hydroxyl, amine and
amide bands are especially susceptible to change.
Regards
Richard
----- Original Message -----
From: "Jim Currie" <sales$##$nuscaan.com>
To: <everybody$##$orglist.net>
Sent: Thursday, September 12, 2002 12:59 AM
Subject: ORGLIST:Polymorphs of Glycine
> Can anyone explain if there are any chemical differences between aplha
> glycine and gamma glycine.
>
> We did not think there would be any differen in glycine but FTIR of
another
> supply shows different peaks.
>
> Both products are glycine and we are involved in production of Aluminium
> Zirconium Glycinates(AZG) for antiperspirants.
> Are there any factors we should be aware of??
>
> If we are dissolving in a solvent the crystal struture should not matter
in
> the formation of the AZG ????
>
> Jim Currie
>
> Nu-Scaan Ltd
> Waterside House
> Waterside
> Macclesfield
> Cheshire SK11 7HG
> UK
> tel +44 (01625) 612170
> fax +44 )01625) 612107
> email sales$##$nuscaan.com
>
>
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