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Few adduct monophosphates are identified and characterized whereas adduct cyclotetraphosphates remains uninvestigated. Their richness into H-bonds constitutes one of the explanatory factors of their peculiar physicochemical properties. In this article, crystals of a new adduct compound, the 4-Methoxybenzylammonium cyclotetraphosphate monophosphoric acid dihydrate [C8H12NO]4P4O12(H3PO4)2.2H2O, have been prepared and characterized by X-ray diffraction, thermal behavior, and IR analysis. This compound is triclinic P[image omitted] with the following unit-cell dimensions: a = 8.115(7), b = 9.997(2), c = 15.180(9) Å, α = 94.36(3), β = 104.30(5), γ = 92.73(3)°, V = 1187.0 (1) Å3, and Z = 1. Crystal structure has been determined and refined to R = 0.035 using 5219 independent reflexions. This structure can be described as inorganic layers parallel to the ab planes, built up of P4O12 rings, H3PO4 monophosphoric acid and water molecules. Between these layers the 4-methoxybenzylammonium cations are located. [ABSTRACT FROM AUTHOR]

Cobalt dimethylphenylpiperazinium cyclotetraphosphate hexahydrate, Co[C 12 H 19 N 2 ] 2 P 4 O 12 .6H 2 O, was synthesized by a reaction between cyclotetraphosphoric acid H 4 P 4 O 12 , cobalt carbonate, and 1-(2,4-dimethylphenylpiperazine). It crystallizes in the triclinic system, space group P, with the following unit cell parameters: a = 7.336(1), b = 8.413(1), c = 14.926(2) Å, α = 87.46(1), β = 83.13(1), γ = 82.98(1)°, V = 907.3(2) Å 3 , and Z = 1. The atomic arrangement can be described as layers containing P 4 O 12 rings a and Co(H 2 O) 6 octahedra spreading in the (001) planes between which are located the dimethylphenylpiperazinium groups via H-bonds. The synthesis and characterization by X-ray diffraction, IR absorption, and thermal analysis are described. [ABSTRACT FROM AUTHOR]