The chemistry of coordination compounds is in an abiding growing and development, thus the number of new compounds constantly increases not only due to their interesting structural characteristics but also due to remarkable particularities and properties. In the case of transition metal supramolecular compounds, magnetic behavior, electrical conductivity and catalytic activity were observed [1]. As a result of the interaction of nickel(II) salts with the sebacic acid (C10H18O4) in presence of phenanthroline, a new [Ni(phen)3]2·[Ni(H2O)6]·(C10H16O4)3·30H2O coordination compound was obtained (Figure). The compound crystalizes in the monoclinicspace group P21/n, with the following unit cell parameters: a = 12.3042(9) Å, b = 32.4582(17) Å, c = 16.0286(13) Å, beta = 108.951(9)°. The structural study of the obtained pink crystals revealed that the compound has an ionic structure formed by three nickel based cations in an octahedral configuration, three sebacic dianions and 30 co-crystallized water molecules.Figure. (left) View of the [Ni(phen)3]2·[Ni(H2O)6]·(C10H16O4)3·30H2O (solvate water molecules are not shown for clarity); (right) View of the packing diagram along axis c.