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[Fwd: Z']

  • To: corecifchem@iucr.org
  • Subject: [Fwd: Z']
  • From: Howard Flack <crystal@flack.ch>
  • Date: Thu, 04 Aug 2005 09:29:42 +0200
FYI to prove people are still interested in Z'

  • To: Howard Flack <Howard.Flack@cryst.unige.ch>
  • Subject: Z'
  • From: "Mátyás Czugler Dr." <czugler@chemres.hu>
  • Date: Tue, 02 Aug 2005 17:17:59 +0000
  • Organization: CRC SCI (Struct.Chem.Inst.)
  • Reply-to: czugler@chemres.hu
Dear Howard,
a good time has elapsed as we last talked to each other. Maybe this Florence 
meeting will give another chance. 
But now I am after a handy Z' definition ... as I am dwelling on this subject 
and can no longer find a very plausible defintion once I had at adebate on a 
CCDC page.
I am a sort of lazy thus I looked up the IUCr webpages and found some 
correspondence of you with David Drown. No further information as to what 
became of these exchanges between you and David.

My questions then:
Did  DMG has finally settled a definition for Z'?
Have you ever considered introducing a Z'' term? (as put forward some two 
years ago by Jon Steed) 

With best wishes,

  • To: czugler@chemres.hu
  • Subject: Re: Z'
  • From: Howard Flack <crystal@flack.ch>
  • Date: Thu, 04 Aug 2005 09:26:38 +0200
  • In-reply-to: <200508021717.59627.czugler@chemres.hu>
  • References: <200508021717.59627.czugler@chemres.hu>

   The discussions within a small group of people working to include 
chemical (i.e. molecular) information inside a CIF turned out to be far 
more difficult than one could have imagined. Z' is part of that effort. 
Some of the problems were chemical or crystal-chemical and some are 
syntactical. So there is still no decent official definition available.

See you in Firenzi,

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