Reactivity of cis-bis(acetylacetonato)dichlorotitanium(IV) towards hydroxy-containing ligands: isolation and characterisation of products †

(OC-6-22)-Bis{2-[1-(2-oxidoethylimino)ethyl]phenolato-κ3 O,N,O′}titanium(IV)

“…The Ti-O bond lengths to the phenolate atoms O2 and O4 are somewhat longer than the bond lengths to the aliphatic atoms O1 and O3. This is due to the stronger C-O bond in the phenoxy groups and was also observed in related structures (Rao et al, 1999). The N atoms are situated in trans positions to each other and have substantially longer distances to the Ti atom than the O atoms.…”

“…Schiff base complexes of titanium have been investigated with respect to different aspects, for instance as chiral dopants for converting nematic into cholesteric phases (Braun et al 2005), as catalysts for the polymerization of ethylene (Owiny et al, 2003), or for enantioselective catalytic transformations (Braun et al, 2004;Yaozhong et al, 1995;Hayashi et al, 1994;Flores-Lopez et al, 2000). A small number of six-coordinate titanium complexes containing two O,N,O 0 -tridentate ligands of Schiff base type have already been structurally characterized (Fleischer, et al 1998;Rao et al, 1999Rao et al, , 2002Hu et al, 2001;Owiny et al, 2003;Flores-Lopez et al, 2000).…”

Coordination characteristics of di-O-picolyl derivative of 1,1′-methylene-bis(2-naphthol): First crystal structure of a monomeric Cu(II) complex of bis{2-[(pyridin-2-yl)methoxy] naphthalen-1-yl}methane

“…Such orientation is well suited for forming polymeric structures when complexed with metal ions. However, the experimental observations reveal that when each of the aromatic ring is mono-derivatized, the corresponding derivatives yield monomeric complexes rather than the expected polymeric one [1,2]. On the other hand, when the mbn is di-derivatized on each of its aromatic ring, viz., 2,3-and 2 0 ,3 0 -, like that in the pamoic acid, that possesses additional -COOH groups, the resulting metal ion complexes are no more monomeric but tend to be mainly oligomeric or polymeric in nature [3][4][5][6].…”

“…On the other hand, when the mbn is di-derivatized on each of its aromatic ring, viz., 2,3-and 2 0 ,3 0 -, like that in the pamoic acid, that possesses additional -COOH groups, the resulting metal ion complexes are no more monomeric but tend to be mainly oligomeric or polymeric in nature [3][4][5][6]. The monomeric complexes involving directly the mbnmoiety (excluding those of the phosphorous derivatives) are rather sparse and includes W(VI) [1] and Ti(IV) [2]. Therefore, it is of great relevance and importance to the development of the coordination chemistry of such molecular systems, viz., mbn-derivatives.…”