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Yttrium and ytterbium(III) complexes with ansa-linked bis(amidinate) ligand containing conformationally rigid o-phenylene bridge

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Abstract

The new tert-butoxide yttrium complex [C6H4-1,2-NC(But)N(2,6-Me2C6H3)}2]YOBut(DME) containing the dianionic ansa-linked bis(amidinate) ligand with the rigid o-phenylene linker was synthesized by the metathesis of the chloride complex [C6H4-1,2-NC(But)N(2,6-Me2C6H3)}2]Y(THF)(μ2-Cl)2Li(THF)2 with potassium tert-butoxide and structurally characterized. The synthesized yttrium bis(amidinate) tert-butoxide complex exhibits a moderate catalytic activity in the polymerization of rac-lactide under mild conditions but makes it possible to carry out the process with high control and obtain atactic polylactide with a narrow molecular weight distribution (M n /M w = 1.55) and good correspondence of the calculated and experimentally determined M n . It was found by X-ray diffraction analysis that the substitution in the coordination sphere of the ytterbium atom in complex [C6H4-1,2-{NC(But)N(2,6-Me2C6H3)}2]YbCl(DME) of a DME molecule for two THF molecules resulted in the migration of the chloride ligand from the apical to equatorial position.

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Authors and Affiliations

  1. G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 49 ul. Tropinina, 603950, Nizhni Novgorod, Russian Federation

    A. O. Tolpygin, A. V. Cherkasov, G. K. Fukin & A. A. Trifonov

Authors
  1. A. O. Tolpygin
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  2. A. V. Cherkasov
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  3. G. K. Fukin
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  4. A. A. Trifonov
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Corresponding author

Correspondence to A. A. Trifonov.

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Dedicated to Academician of the Russian Academy of Sciences Yu. N. Bubnov on the occasion of his 80 birthday.

Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2299–2304, October, 2014.

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Tolpygin, A.O., Cherkasov, A.V., Fukin, G.K. et al. Yttrium and ytterbium(III) complexes with ansa-linked bis(amidinate) ligand containing conformationally rigid o-phenylene bridge. Russ Chem Bull 63, 2299–2304 (2014). https://doi.org/10.1007/s11172-014-0738-9

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  • DOI: https://doi.org/10.1007/s11172-014-0738-9

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