The synthesis and crystal structure of a new monophosphate, (C
12H
19N
2)H
2PO
4·H
2O, are discussed, based on an X-ray crystal structure investigation. This compound crystallizes in the monoclinic system, with the space group
P2
1/
c and the following parameters:
a = 15.226(2),
b = 6.984(3),
c = 15.359(5)Å,
β = 95.44(2)°,
Z = 4 and
V = 1625.8(9)Å
3. The crystal structure was determined and refined to
R = 0.0483 using 2208 independent reflections. The atomic arrangement of this compound is built up by (H
4P
2O
8)
2- dimers. Each dimer aggregates with water molecules to form inorganic layers, in the
x = 1/2 planes, through hydrogen-bond interactions. Between those layers, the organic cations (C
12H
19N
2)
+ are oriented in a similar direction, so that they form intermolecular van der Waals interactions and, particularly, strong hydrogen bonds with oxygen atoms of the anionic layers.
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