Crystal structure of guanidinium squarate dihydrate: C4O4 · 2C(NH2)3 · 2H2O
Abstract
The crystal and molecular structure of guanidinium squarate dihydrate, C4O4 · 2C(NH2)3 · 2H2O, has been determined by X-ray analysis. Each squarate dianion is linked by bidentate hydrogen bonds to two guanidinium cations. The origin molecule is nearly coplanar with the molecule generated by the glide plane and translated along the ac plane diagonal; they form a wide ribbon, which is repeated parallel, but shifted down of 1.316(7) Å, by the translation along the ac plane diagonal. This arrangement gives rise to a bidimensional network resembling a sort of thick, undulated layer, which is repeated by the a translation at a distance of 3.464(7) Å. The water molecules of crystallization, located between these layers, provide the interlayer connection and play a fundamental role in the stabilisation of the crystal structure.
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- Connecting icosahedral and dodecagonal order
- A warning in indexing triclinic powder diffraction data
- A lithium molybdenum(V) monophosphate, Li3(MoO)2(PO4)3 structurally related to Li2Na(MoO)2(PO4)3
- Crystal structure of a cubic Al70Pd23Mn6Si; a 2/1 rational approximant of an icosahedral phase
- The crystal chemistry of doyleite, Al(OH)3
- Single crystal Mössbauer and neutron powder diffraction measurements on the synthetic clinopyroxene Li-acmite LiFeSi2O6
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