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Synthesis and crystal structure are described for a new non- cento-symmetric organic-cation monophosphate, C5H10NH2·H2PO4. This compound is triclinic P1 with the following unit-cell parameters: a=6.2397(6), b=8.4191(7), c=8.8523(2) Å, α=112.485(4), β=89.992(4), γ=90.104(7)°, V=429.37(5) Å3, Z=2, and Dx=0.709 g cm−3. Crystal structure was solved with a final Rvalue of 0.03 for 2347 independent reflections. The H2PO4groups form, via strong hydrogen bonds, corrugated infinite chains (H2PO4)n−nspreading along the a direction. Between these chains coexist two crystallographically independent organic groups, which connect the chains with hydrogen bonds.

The quantitative determination of total phenols, ellagic tannins and gallic and ellagic acids in the peel of the Tunisian pomegranate variety Chelfi, has been carried out. The ellagic tannin content is prominently less than the amount of total phenols, which led us to look for the presence of the condensed tannins. The determination of the content of catechic tannins in eight Tunisian varieties of the pomegranate was carried out using weekly samples over a period of 2 months.

Chemical preparation and x-ray characterization of a new compound hexaaqua-1,3-diammoniumpropane cobalt(II) nitrate, Co(H2O) 6 [C3H12N2] (NO3)4 are reported. This mixed organo-mineral compound crystallizes in the orthorhombic system with Cmcm space group. The unit cell dimensions are: a = 10.795(7), b = 11.969(4), c = 14.685(5) Å, Z = 4 and V = 1897.5(12) Å3. The structure was solved using the direct method and refined to reliability R-factor of 0.036 using 2554 independent reflections. In this atomic arrangement the different species built a three-dimensional network.

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