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

Author:

Tabatabaee Masoumeh1,Poupon Morgane2,Eigner Václav2,Vaněk Přemysl2,Dušek Michal2

Affiliation:

1. Department of Chemistry , Yazd Branch, Islamic Azad University , Yazd , Iran

2. Institute of Physics ASCR , v.v.i., Na Slovance 2 , 182 21 Praha 8 , Czech Republic

Abstract

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.

Publisher

Walter de Gruyter GmbH

Subject

Inorganic Chemistry,Condensed Matter Physics,General Materials Science

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