JOURNAL OF THE CHINESE
CHEMICAL SOCIETY
Titanium(IV) Complexes of Unsymmetrical Schiff Bases
catechol, salicylic acid, benzilic acid and succinic acid
have the potential to make strong s and p donations thus
causing stabilization of the high eight-coordination geome-
try of the high oxidation Ti4+. The microanalytical and
spectral data of the different types of complexes were all
consistent with their desired formulations. The diamag-
netic behaviour and the UV-vis spectra of the complexes
containing no d-d but the LMCT bands indicated the ex-
pected 3do electronic configuration characteristic of the de-
sired 4+ oxidation state of the central titanium ion in these
complexes. The probable structures of complexes are as
shown in Scheme II.
Fig. 2. Inhibition of fungi mycelial growth by the
tested compounds.
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But specific criterion was not detected. The chelate com-
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CONCLUSIONS
The dibasic tetradentate non-N-substituted diamine
bis-Schiff bases (LH2) of orthohydroxyaldehydes/ketones
satisfy two primary and four secondary valencies of Ti(IV).
The presently used ethylenediamine possessing two sym-
metrical amino groups form bis-Schiff bases with an alde-
hyde or a ketone. A number of mixed-ligand Ti(IV) com-
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synthesise. And mixed-ligand [TiL¢2B] type complexes
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dentate ligand was formed through in-situ partial displace-
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sired mixed–ligand complexes, [TiL¢2B]. The observed
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not be explained unless an eight-coordinate structure is as-
sumed.23,24 However, formation of eight-coordination
complexes of Ti(IV) is not rare. Bidentate ligands like
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