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On the structural mechanism of the Reaction Pb(H 2 PO 4 ) 2 → PbHPO 4 + H 3 PO 4
Author(s) -
Worzala H.,
Jost K. H.
Publication year - 1991
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.19915980118
Subject(s) - amorphous solid , decomposition , chemistry , reaction mechanism , order (exchange) , mechanism (biology) , distribution (mathematics) , crystallography , medicinal chemistry , inorganic chemistry , organic chemistry , mathematics , catalysis , physics , business , mathematical analysis , finance , quantum mechanics
Decomposition of Pb(H 2 PO 4 ) 2 into PbHPO 4 and amorphous H 3 PO 4 proceeds crystallographically oriented. In order to prove a topotactic model for the mechanism of the reaction formerly derived from comparison of the structures, the As/P ratios of arsenatephosphate mixed crystals Pb[H 2 (As,P)O 4 ] 2 and of their reaction products PbH(As,P)O 4 and H 3 (As,P)O 4 were determined. The crystalline PbH(As,P)O 4 showed in each case a higher As‐content than the educt and the amorphous H 3 (As,P)O 4 . Comparison of these results with the expectation values according to probability theory for the As/P‐distribution confirm the topotactic mechanism of the reaction.