Synthesis and Crystal Structure of Bis(.ETA.5-Cyclopentadienyl)-2,6-Pyridinedicarboxylato Titanium(IV) Complex, at 153 K

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The reaction of TiCl2(Cp)2 in methanol (Cp = cyclopentadienyl) with LH2, (pydaH2)(pydc) (pyda = 2,6-pyridinediamine, pydcH2 = 2,6-pyridinedicarboxylic acid) in water, which is ion-pairing, led to the formation of a Ti(IV) complex, [Ti(Cp)2(pydc)]. The crystal and molecular structure of complex was determined by X-ray diffraction. This complex crystallized in the crystal system of tetragonal with the space group P43212 and four molecules per unit cell. The unit cell parameters at 153 K were a = 7.840(1)Å, c = 22.590(5)Å, and V = 1388.4(4)Å3. The R value was 0.0247 for 1454 measured reflections. Each titanium atom is coordinated by two cyclopentadienyl rings and three atoms (two oxygen atoms and one nitrogen atom) from 2,6-pyridinedicarboxylate group, respectively. Therefore, coordination number of Ti(IV) is five.