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In situ crystallization of the linear alkynes Cn H2n2 (n=7, 8, 9, 10)

  • Andrew D. Bond EMAIL logo and John E. Davies
Published/Copyright: June 6, 2014

Abstract

A manual in situ crystallization technique is described, for application on a κ-geometry area-detector instrument. The technique has been applied to grow crystals of some linear alkynes: 1-heptyne, 1-octyne, 1-nonyne and 1-decyne, Cn H2n2 (n=7, 8, 9, 10). The structures with odd n (1-heptyne and 1-nonyne) crystallize in space group Pca21. The structures with even n (1-octyne and 1-decyne) crystallize in space group P21/c, with two molecules in the asymmetric unit (Z′=2) and an approximately orthorhombic metric. All of the structures contain layers of molecules with a square unit mesh of dimensions 5.7×7.2 Å, identical to the layers present in the previously published structures of 1,7-octadiyne and 1,9-decadiyne. The structures differ where the methyl groups meet, giving systematically greater packing efficiency for 1-heptyne and 1-nonyne, compared to 1-octyne and 1-decyne. This systematic alternation in crystal density is correlated with an alternation in melting points.


Corresponding author: Andrew D. Bond, Department of Pharmacy, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen Ø, Denmark, E-mail:

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Received: 2014-1-21
Accepted: 2014-5-2
Published Online: 2014-6-6
Published in Print: 2014-9-1

©2014 by De Gruyter

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