New coordination motives at cyclothiazeno complexes of molybdenum and tungsten.: Crystal structures of [{Mo(N3S2) (CI)(OtBu)2}{Mo(O)(N3S2) (OtBu)}]2 and [W(N3S2)2(LiCI) {N≡W(NPPh3)3}2]

The metalla cyclothiazeno complexes (Cyclo-1 lambda(6)-metalla-3,5-dithia-2,4,6-triazino complexes) [{Mo(N3S2)(Cl) . ((OBu)-Bu-t)(2)}{Mo(O)(N3S2)((OBu)-Bu-t)}](2) (1) and [W(N3S2)(2)(LiCl) . {N=W(NPPh3)(3)}(2)] (2) are formed from [MoCl3(N3S2)](2) and (LiOBu)-Bu-t in toluene, and from [WCl3(N3S2)](2) and LiNPPh3 in THF, respectiveIy. The complexes form moisture sensitive, black (1) or brown (2) crystals, which we characterized by crystal structure analyses. 1 . Toluene: Space group <P(1)over bar>, Z = 1, lattice dimensions at -83 degrees C a = 934.2(1), b = 964.4(1) c = 1700.3(1) pm; alpha = 83.54(1)degrees, beta = 78.35(1)degrees, gamma = 71.56(1)degrees, R-1 = 0.0339. 2 . 1.625 Toluene . 0.75 THF: Space group <P(1)over bar>, Z = 4, lattice dimensions at -80 degrees C: a = 1313.8(1), b = 2896.8(2), c = 3384.9(3)pm; alpha = 82.42(1)degrees, beta = 88.71(1)degrees, gamma = 77.28(1)degrees, R-1 = 0.0603.