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The Role of Hydrogen Bonding in the Crystal Structures of Zinc Phosphate Hydrates
Author(s) -
Herschke Laurent,
Enkelmann Volker,
Lieberwirth Ingo,
Wegner Gerhard
Publication year - 2004
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200305693
Subject(s) - hydrogen bond , zinc , crystal structure , phosphate , crystallography , hydrogen phosphate , materials science , hydrate , chemistry , inorganic chemistry , metallurgy , molecule , organic chemistry
The compounds α‐ and β‐hopeite have been synthesised by hydrothermal crystallisation from aqueous solution at 90 °C and 20 °C, respectively. The crystal structures of these polymorphic forms of zinc phosphate tetrahydrate (ZPT), Zn 3 (PO 4 ) 2 ⋅4 H 2 O, have been resolved. Single‐crystal analysis proves that the main difference between the α and β forms of ZPT is caused by the difference in orientation of one of the water molecules in the ZnO 6 octahedral network, indicating two different hydrogen‐bonding patterns. A previously unknown hopeite, Zn 3 (HPO 4 ) 3 ⋅3 H 2 O (ZHPT), has been isolated and analysed. This helps to achieve a better understanding of the mechanism of formation of zinc phosphate compounds. Unambiguous identification of each phase is established by analysis of their unique thermal behaviour and thermodynamic interrelationship.