Structures of bis-ethylmaltolatodichloro-tin(IV) and -titanium(IV) and of trichloro(1-methyl-2-ethyl-3-hydroxy-4H-pyridin-4-onato)-aquatin(IV)

The structures of solvates of the bis-ethylmaltolatodichloro-metal(Iv) comp lexes M(etma)(2)Cl-2 with M = Sn and Ti, and of trichloro(lmethyl-2-ethyi-3 -hydroxy-4H-pyridin-4-on)aquatin(IV), Sn(mepp)Cl-3(H2O), have been establis hed by single crystal X-ray diffraction methods. Sn(etma)(2)Cl-2, crystalli sed with one molecule of dichloromethane, Ti(etma)(2)Cl-2 with one molecule of tetrahydrofuran, and Sn(mepp) Cl-3(H2O) with one molecule of acetone, f rom their respective recrystallisation media. Both ethylmaltol complexes M( etma)(2)Cl-2 are cis-octahedral. The coordination around the tin atom in Sn (mepp) Cl-3(H2O) approximates to octahedral, with the three chloride ligand s in fac geometry. The tin(IV)-water bond distance in this pyridinone compl ex is discussed in relation to this distance in other aquatin(IV) complexes . The effects of coordinating tin(IV) on the geometry of the coordinated py ridinone are considered. (C) 2000 Elsevier Science Ltd All rights reserved.