The reaction of bis (3,5-dimethyl-1,2,4-triazol-1-yl) methane, CH2 (3,5-Me2Tz) 2, with M (CO) 6 (M=Cr, Mo or W) in refluxingDME produces CH2 (3,5-Me2Tz) 2M (CO) 4 in moderate yield. The crystal structures determined by X-ray analysis show thatbis (3,5-dimethyl-1,2,4-triazol-1-yl) methane acts as a chelating bidentate ligand with two endodentate nitrogen atoms in thesecomplexes. Reactions of complexes CH2 (3,5-Me2Tz) 2M (CO) 4 (M=Mo or W) with R2SnX2 (R=Ph or Me; X=Cl or Br) in a1:1 or 1:2 ratio, respectively, only yield 1:1 adducts. In these adducts, bis (3,5-dimethyl-1,2,4-triazol-1-yl)methane may coordinateto tin atom through exodentate nitrogen atoms on the 4-position of triazole rings to form linkage coordination polymers. Possiblyowing to weak donors of 4-position exonitrogen atoms on triazole rings to organotin acceptors, the dissociation of these adductsin solution could exist. Adduct of CH2 (3,5-Me2Tz) 2W (CO) 4