The Forgotten Polymorphism of Hydrazine Sulfate : Crystal Structure of the Metastable Monoclinic Form II

Titelangaben

Martin, Thomas ; Fleissner, Juliane ; Milius, Wolfgang ; Breu, Josef:
The Forgotten Polymorphism of Hydrazine Sulfate : Crystal Structure of the Metastable Monoclinic Form II.
In: Zeitschrift für anorganische und allgemeine Chemie. Bd. 643 (2017) Heft 23 . - S. 2019-2023.
ISSN 1521-3749
DOI: https://doi.org/10.1002/zaac.201700336

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Abstract

A so far structurally unknown polymorph (form II) of dihydrogenhydrazinium (hydrazine) sulfate(IV) was isolated as macroscopic single crystals and its structure was determined and refined as twin from single crystal X-ray data collected at 173K [cell parameters: a = 5.5592(11) Å, b = 7.3571(15) Å, c = 10.270(2) Å, β = 96.75(3)°, V = 416.21(15) Å3, space group P21/c]. The structure shows some similarities to the structure of the known form I: Both form II and I share zick-zack shaped strands of [SO4]2--ions running along the a-axes. Within both forms the strands are separated by trans type (staggered) [N2H6]2+-ions. The spatial orientation is, however, different in both forms. Consequently, distinct H-bond networks are formed. The new form II was proven to be metastable and converts into form I within one day as monitored with powder X-ray diffraction (PXRD).