Supramolecular compound [MoO_2(OCH_2C_5H_4N)_2] has been prepared by the reaction of Na_2MoO_4·2H_2O with 2-(chloromethyl) pyridine hydrochloride and structurally characterized by means of X-ray single crystal diffraction. IN the structural unit, there are two kinds of Mo atoms [Mo(1) and Mo(2)], both of which are at six coordination geometry but show different chemical environment. [Mo(1)O_2 (OCH_2C_5H_4N)_2] and [Mo(2) O_2(OCH_2C_5H_4N)_2] form A and B sheets by intra-layer hydrogen bonds O…H-C and π…π interactions, respectively. The inter-layer hydrogen bonds O…H-C connect the A layer and B layer into a "…ABAB…" three-dimensional network in the solid-state. Its third-order nonlinear optical (NLO) properties were determined by Z-scan techniques in DMF solution. The results indicate that the complex exhibits very strong NLO absorption and strong self- focusing. Effect. The third-order NLO absorptive coefficient α_2, refractive index n_2 and effective susceptibility X~((3)) are 1.92 I 10~(-9) m·W~(-1) and 1.21 * 10~(-12) esu, respectively.

Key words: SUPERMOLECULAR STRUCTURE, HYDROGEN BONDS, CRYSTAL STRUCTURE, NON LINEAR OPTICS, POLARIZABILITIES, MOLYBDENUM COMPLEX, PYRIDINE P