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Synthesis and structure of cis-dioxo(3-methoxysalicylaldehyde 4-methylthiosemicarbazonato-N, O, S)(γ -picoline-N)molybdenum(VI)

Red crystals of cis-dioxo(3-methoxysalicylaldehyde 4-methylthiosemicarbazonato-N, O, S)(γ -picoline-N)molybdenum(VI), [MoO2L(γ -pic)], [L2– = CH3OC6H4(O)CH=NN=C(S)NHCH3, 3-methoxysalicylaldehyde 4-methylthiosemicarbazonato] were prepared by the reaction of [MoO2L]n with γ -picoline in dry methanol. The title compound crystallized in the monoclinic space group P21/n, a = 6.7984(7) Å , b = 15.9760(12) Å , c = 17.1466(14) Å , β = 93.613(8)°, V = 1858.6(3) Å 3, Z = 4. The coordination geometry around the molybdenum center is distorted octahedral with the tridentate thiosemicarbazonato ligand (L2– ) bonded meridionally to the [MoO2]2+ core. The sixth coordination site is occupied by a weakly bound γ -picoline molecule. The adjacent molecules are joined by the N– H· · · O hydrogen bonds between their amino and methoxy groups thus forming infinite molecular chains. The three-dimensional solid-state structure is achieved by the additional C– H· · · O, C– H· · · π and van der Waals interactions.

Molybdenum(VI) complex; Thiosemicarbazone; Tridentate ligand; Crystal structure; X-ray analysis; Hydrogen bond

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