The Role of Hydrogen Bonding in the Crystal Structures of Zinc Phosphate Hydrates

Abstract

The compounds alpha- and beta-hopeite have been synthesised by hydrothermal crystallisation from aqueous solution at 90 degrees C and 20 degrees 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 alpha and beta 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.

Synthesis, structure and luminescence property of two lanthanum phosphite hydrates: La2(H2O)x(HPO3)3 ()

“…Hydrogen bonding manifests itself in the strong and broad features at ca. 3600-2700 cm Àl , and the band is broader but weaker in the spectrum of 1 than in that of 2, with a decoupling of bands at 1658 and 1627 cm À1 in 2, indicating at least two types of water molecules different from that in compound 1 [29]. The internal vibration of crystal water molecules in 1 is a single peak at around 1630 cm À1 .…”

Thermally Highly Stable Amorphous Zinc Phosphate Intermediates during the Formation of Zinc Phosphate Hydrate

“…The channels used in the C-REDOR 69,70 experiments are denoted as S{I}, where S refers to the observed nucleus and I to the recoupled one. The 31 P{ 1 H} C-REDOR experiment was performed at a sample spinning frequency ν r of 40 kHz with a recycle delay set to 27 s, accumulated 32 transients/FID and was implemented using TPPM decoupling with a nutation frequency of 16 kHz. The crystal structure of hopeite used for the calculation of C-REDOR curves was taken from ref 72.…”

A new photoluminescent supramolecular inorganic‐organic hybrid zincophosphate complex pillared by carboxylate ligand through hydrogen bonding interactions

“…The O-Zn-O bond angles are nearly perfect and in the range of 86.12 -180°. Notice that Zn atom is octahedrally coordinated to six oxygen atoms, and this ZnO 6 unit is rarely mentioned in the synthesis of zincophosphate materials [23,24]. The Zn atoms are connected to the neighboring P atoms via Zn-O-P bridges (bond angle Zn-O1-P =134.35°, Zn-O4-P =129.27°).…”