Startseite The role of hydrogen bonds in order-disorder transition of a new incommensurate low temperature phase β-[Zn-(C7H4NO4)2]·3H2O
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The role of hydrogen bonds in order-disorder transition of a new incommensurate low temperature phase β-[Zn-(C7H4NO4)2]·3H2O

  • Masoumeh Tabatabaee EMAIL logo , Morgane Poupon , Václav Eigner , Přemysl Vaněk und Michal Dušek
Veröffentlicht/Copyright: 8. Dezember 2017

Abstract

The room temperature structure with P21/c symmetry of the zinc(II) complex of pyridine-2,6-dicarboxylic acid was published by Okabe and Oya (N. Okabe, N. Oya, Copper(II) and zinc(II) complexes of pyridine-2,6-dicarboxylic acid. Acta Crystallogr. C. 2000, 56, 305). Here we report crystal structure of the low temperature phase β-[Zn(pydcH)2]·3H2O, pydc=C7H3NO4, resulting from the phase transition around 200K. The diffraction pattern of the low temperature phase revealed satellite reflections, which could be indexed with q-vector 0.4051(10)b* corresponding to (3+1)D incommensurately modulated structure. The modulated structure was solved in the superspace group X21/c(0b0)s0, where X stands for a non-standard centring vector (½, 0, 0, ½), and compared with the room temperature phase. It is shown that hydrogen bonds are the main driving force of modulation.

Acknowledgements

This research was supported by Yazd Branch, Islamic Azad University- project 51053910927005 and the crystallographic part was supported by the project 15-12653S of the Czech Science Foundation using instruments of the ASTRA lab established within the Operation program Prague Competitiveness - project CZ.2.16/3.1.00/24510.

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Supplemental Material:

The online version of this article offers supplementary material (https://doi.org/10.1515/zkri-2016-2013).


Received: 2016-10-15
Accepted: 2017-5-8
Published Online: 2017-12-8
Published in Print: 2018-1-26

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