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Crystal Structure of Melaminium Orthophosphate from High‐Resolution Synchrotron Powder‐Diffraction Data
Author(s) -
De Ridder Dirk J. A.,
Goubitz Kees,
Brodski Vladimir,
Peschar René,
Schenk Henk
Publication year - 2004
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.200490168
Subject(s) - chemistry , crystallography , crystal structure , molecule , synchrotron , powder diffraction , diffraction , protonation , perpendicular , crystal (programming language) , hydrogen bond , x ray crystallography , ion , optics , geometry , organic chemistry , programming language , physics , mathematics , computer science
The crystal structure of melaminium orthophosphate (MP) has been determined from high‐resolution synchrotron powder‐diffraction data. The crystal packing consists of melaminium layers and pairs of orthophosphate chains connected by H‐bonds almost perpendicular to the layers. The distance between melaminium layers is 3.62 Å. Neighboring melaminium molecules do not lie in the same plane, but in two parallel planes at close distance (0.79 Å), and are shifted with respect to each other. The orthophosphate chains are connected by both intra‐chain and inter‐chain H‐bonds. The melamine is singly protonated at an endocyclic N‐atom. The powder‐diffraction data were corroborated by solid‐state NMR experiments.