CHELATE COMPLEXES WITH TRIPODAL TRIISOCYANIDE LIGANDS - SYNTHESIS AND CRYSTAL-STRUCTURES OF FAC-([N(CH2CH2CH2O-3-CNC6H4)3]W(CO)3).0.5CH2CL2 AND FAC-([N(CH2CH2CH2O-2-CNC6H4)3]W(CO)3.HCL).2.5CH2CL2

The tripodal triisocyanide ligands tris[3-(3-isocyanophenoxy)propyl]amine (4, m-tarc), tris[3-(2-isocyanophenoxy)propyl]amine (5, o-tarc), and tris(3-isocyanopropyl)amine (6, talc) react with fac-[(C7H8)M(CO)3] (M = Cr, Mo, W) to give the chelate complexes fac-[(m-tarc)W(CO)3] (7), fac-[(o-tarc)-M(CO)3] [8; M = Cr (a), Mo (b), W (c)], and [(talc)W(CO)3] (9), respectively. The molecular structures of 7 and 8c were determined by X-ray structure analysis, showing that indeed chelate complexes had formed. 7 crystallized with 0.5 molecules of CH2Cl2 in the crystal lattice. The central nitrogen atom adopts the ''in'' configuration. 8c crystallized as the hydrochloride with 2.5 molecules of CH2Cl2 in the crystal lattice. The protonated central nitrogen atom is in the ''out'' configuration. Crystal data: for 7.0.5CH2Cl2, monoclinic, C2/c, a = 14.848 (3) angstrom, b = 26.016 (7) angstrom, c = 17.866 (5) angstrom, beta = 101.56 (2)-degrees, Z = 8, R = 0.0500, and R(w) = 0.0399 for 3208 reflections [I greater-than-or-equal-to 2-sigma(I)]; for 8c.HCl.2.5CH2Cl2, triclinic, P1BAR, a = 12.491 (4) angstrom, b = 13.414 (4) angstrom, c = 15.365 (2) angstrom, alpha = 114.73 (2)-degrees, beta = 105.39 (2)-degrees, gamma = 101.89 (2)-degrees, Z = 2, R = 0.0410, and R(w) = 0.0559 for 5052 reflections (I greater-than-or-equal-to 3-sigma(I)].