N-(o-methylphenyl) ferrocenesulfonamide was synthesized by the reaction of ferrocenesulfonyl chloride with o-toluidine. The compound was characterized by elemental analysis. IR, and ~1H NMR, ~(13)C NMR. The crystal structure was determined by X-ray diffraction. The crystal belongs to monoclinic with space group P2_l/c, a = 1.0436(2) nm, b = 1. 2377(3) nm, c = 1.2643(3) nm, β = 107.42(1)°, Z = 4, V = 1.5581(6) nm~3, D_c = 1.514 g/cm~3, μ = 1.106 mm~(-1), F(000) = 736, R_1 = 0. 0470, wR_2 = 0.0580. The optimized structure was obtained by Gaussian 98W, and compared with experimental result. Thermal decomposition of the title compound has also been studied. The DSC, TG and DTG curves of the compound are given and interpreted.

Key words: FERROCENE P, SULFAMIDE P, CRYSTAL STRUCTURE, THERMAL DECOMPOSITION, IR, STRUCTURE CHARACTERISTICS, THERMAL STABILITY