Formation and crystal structures of [(alkoxy)bis(pyridin-2-yl)methanolato- N,O,N]tin(IV) complexes

• Published in: Polyhedron 2010-02, Vol.29 (2), p.739-748
• Main Authors: Alan Howie, R., de Lima, Geraldo M., Wardell, James L., Wardell, Solange M.S.V.
• Format: Article
• Language: English
• Subjects: Alkoxy (bis(pyridin-2-yl)methanolato complexes; Bis(pyridin-2-yl)ketone; Hemiketal-based ligands; Mononuclear Sn(IV) complexes; N,O,N ligands
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2009.10.021

[(Alkoxy)bis(pyridin-2-yl)methanolato- N,O,N]tin(IV) complexes, have been obtained from reactions between bis(pyridin-2-yl)ketone and SnX 4 or RSnX 3 in alcohol solutions. Reactions of bis(pyridin-2-yl)ketone with tin tetrahalides, SnX 4 (X = Cl or Br), or organotin trichlorides, R ′SnCl 3 (R ′ = Ph, Bu or CH 2CH 2CO 2Me), in ROH (R = Me or Et) readily produces RObis(pyridin-2-yl)methanolato)tin complexes, [ 5: RO(py) 2C(OSnX 3)] ( 5: R,X = Me,Cl; Et,Cl; Et,Br) or [ 6: MeO(py) 2C(OSnCl 2R ′)] (R ′ = Ph, Bu, CH 2CH 2CO 2Me). In addition, halide exchange reaction between SnI 4 and ( 5: R,X = Me,Cl) occurred to give ( 5: R,X = Me,I). The crystal structures of six tin(IV) derivatives indicated, in all cases, a monoanionic tridentate ligand, [RO(py) 2C(O −)- N,O,N], arranged in a fac manner about a distorted octahedral tin atom. The Sn–O and Sn–N bonds lengths do not show much variation amongst the six complexes despite the differences in the other ligands at tin.