A novel supramolecular compound [H2(C18H18N2O2)] (SCN)2 was obtained by reaction of Fe(NO3)3 and KSCN with C18H18N2O2. This compound has a two-dimensional network structure, in which there exists three types of hydrogen bonds: N┈H—N,S┈H—C(CH2) and S┈H—C(CH). The structure of this supramolecule was established by X-ray diffraction: triclinic, group space P1, a=0.69115(14) nm, b=0.86367(17) nm, c=0. 91352(18)nm, α=84.03(3)°, β=78.65(3)°, γ=81.87(3)°, V=0.52764(18) nm^3, Z=2, R=0.0670. This compound in DMF solution shws strong third- order non-linear optical properties with a calculated χ^(3) of 6.27× 10^-12 esu.

Key words: THIOCYANATO COMPLEX, PYRIDYL, PHENYL ETHER P, HYDROGEN BONDS, SUPERMOLECULAR STRUCTURE, CRYSTAL STRUCTURE, NON LINEAR OPTICS