On the mechanism of the conversion of lead dihydrogenphosphate, Pb(H 2 PO 4 ) 2 , into lead monohydrogenphosphate, PbHPO 4 , and phosphoric acid | Zendy

Worzala H. | Zendy; Jost K. H. | Zendy

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On the mechanism of the conversion of lead dihydrogenphosphate, Pb(H 2 PO 4 ) 2 , into lead monohydrogenphosphate, PbHPO 4 , and phosphoric acid

Author(s) -

Worzala H.,

Jost K. H.

Publication year - 1982

Publication title -

zeitschrift für anorganische und allgemeine chemie

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.354

H-Index - 66

eISSN - 1521-3749

pISSN - 0044-2313

DOI - 10.1002/zaac.19824860119

Subject(s) - crystallite , phosphoric acid , amorphous solid , crystallography , chemistry , crystal structure , materials science , organic chemistry

The mechanism of the topotactic reaction Pb(H 2 PO 4 ) 2 → PbHPO 4 + H 3 PO 4 was investigated and the crystal structures of Pb(H 2 PO 4 ) 2 and PbHPO 4 were determined. Starting from a monocrystal of Pb(H 2 PO 4 ) 2 , the topotactic character becomes visible: The crystallites of PbHPO 4 are formed in a unique crystallographic orientation. The phosphoric acid is amorphous and included in these crystallites. A comparison of the two crystal structures in the observed orientation relation shows that both contain a motif of the same kind, which is in the same orientation. On this basis a hypothesis on the structural mechanism of the investigated reaction is discussed.

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