RE: ORGLIST:Help: crystals required!

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From: Palat Karel (palat$##$faf.cuni.cz)
Date: Fri Dec 05 2003 - 11:03:33 EST

Guanidinium kation generally forms crystalls with nitrate anion, carbonates are also insoluble in water.. Try to add nitric acid.

***********************************************************************
* Dr. Karel Palat
* Dep. Inorg. & Org. Chemistry, Faculty of Pharmacy, Charles University
* Heyrovskeho 1203
* 500 05 Hradec Kralove, Czech Republic
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* phone: CZ-495067377, fax: CZ-495514330
* e-mail: palat$##$faf.cuni.cz
**********************************************************************

-----Original Message-----
From: everybody-admin$##$orglist.net [mailto:everybody-admin$##$orglist.net]On Behalf Of Sandra Bartoli
Sent: Friday, December 05, 2003 3:03 PM
To: everybody$##$orglist.net
Subject: ORGLIST:Help: crystals required!

Dear All,
I desperately need advice on how to get crystals of my macrocycle.
It is a diguanidinium macrocycle and the counterion at the moment is PF6-
but I can try and exchange it. What would be the best counterion to get
crystals (suitable for crystal structure)?
The macrocycle is soluble in MeOH and CH3CN. I have tried several solvents
but, with PF6- as a counterion it doesn't seem to crystallise.

Sandra Bartoli
PhD student
Department of Chemistry
University of Southampton
int: 26767
ext: 02380596767

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