From: Jacob Zabicky (zabicky$##$bgumail.bgu.ac.il)
Date: Sat Dec 06 2003 - 12:45:07 EST
Begin forwarded message:
> From: Jacob Zabicky <zabicky$##$bgumail.bgu.ac.il>
> Date: Sat Dec 6, 2003 19:27:01 Asia/Jerusalem
> To: "Sandra Bartoli" <S.BARTOLI$##$soton.ac.uk>
> Subject: Re: ORGLIST:Help: crystals required!
>
> Dear Sandra,
>
> Getting nice crystals for XRD is IMO first a matter of luck and then
> an art, but you may try several things. First make sure you have
> "enough" starting material, because you may lose some in the trials.
>
> Ammonium compounds often crystallize well with tetraphenylborate
> counter ions, but that may introduce too many new irrelevant atoms in
> your molecule. Perchlorate might also work well, and you have the
> heavier Cl atom, which is beneficial to the XRD methodology. With the
> new instrumentaton you usually need not have a very large crystal, but
> certainly you need a good one. Ask the crystallographer how big it
> need be.
>
> Mazel-Tov!
>
> Jacob
> On Friday, Dec 5, 2003, at 16:03 Asia/Jerusalem, Sandra Bartoli wrote:
>
>> 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
>>
>> _______________________________________________
>> ORGLIST - Organic Chemistry Mailing List
>> Website / Archive / FAQ: http://www.orglist.net
>> To post a message (TO EVERYBODY) send to everybody$##$orglist.net
>> To unsubscribe, send to everybody-request$##$orglist.net the message:
>> unsubscribe your_orglist_password your_address
>> List coordinator: Joao Aires de Sousa (coordinator$##$orglist.net)
>>
> ***************************************************
> Prof. Jacob Zabicky
> Institutes for Applied Research
> Ben-Gurion University of the Negev
> P. O. Box 653, Beer-Sheva, 84105, Israel
>
> Phone: +972-8-6461271; Fax: +972-8-6472969
> zabicky$##$bgumail.bgu.ac.il
> http://www.bgu.ac.il/IAR/Zabicky.htm
> -------------------------------------------------
> Private:
> P. O. Box 12366, Beer-Sheva, 84863, Israel
> Phone: +972-8-6496792
>
>
***************************************************
Prof. Jacob Zabicky
Institutes for Applied Research
Ben-Gurion University of the Negev
P. O. Box 653, Beer-Sheva, 84105, Israel
Phone: +972-8-6461271; Fax: +972-8-6472969
zabicky$##$bgumail.bgu.ac.il
http://www.bgu.ac.il/IAR/Zabicky.htm
-------------------------------------------------
Private:
P. O. Box 12366, Beer-Sheva, 84863, Israel
Phone: +972-8-6496792
_______________________________________________
ORGLIST - Organic Chemistry Mailing List
Website / Archive / FAQ: http://www.orglist.net
To post a message (TO EVERYBODY) send to everybody$##$orglist.net
To unsubscribe, send to everybody-request$##$orglist.net the message: unsubscribe your_orglist_password your_address
List coordinator: Joao Aires de Sousa (coordinator$##$orglist.net)
This archive was generated by hypermail 2.1.4 : Wed Jan 14 2004 - 08:37:01 EST