AI Article Synopsis
- The synthesis of yttrium amidate complexes was achieved through a straightforward reaction between amide proligands and Y(N(SiMe3)2)3, resulting in high yields of pure, crystalline materials.
- The complex tris(N-2',6'-diisopropylphenyl(naphthyl)amidate)yttrium mono(tetrahydrofuran) exhibits a unique 7-coordinate C1 symmetric structure while maintaining one tetrahydrofuran molecule.
- Initial experiments show that this complex can effectively initiate the ring-opening polymerization of epsilon-caprolactone, leading to the formation of high molecular weight polymers.
Article Abstract
The direct synthesis of yttrium amidate complexes using the simple reaction of amide proligands and Y(N(SiMe3)2)3 results in the high-yielding preparation and isolation of crystalline, monomeric materials. The complex, tris(N-2',6'-diisopropylphenyl(naphthyl)amidate)yttrium mono(tetrahydrofuran) (4), was structurally determined to be a 7-coordinate C1 symmetric structure, maintaining one bound tetrahydrofuran molecule. Compound 4 (C12H17[NCO]C10H7)3Y(C4H8O) crystallized in the monoclinic space group P2(1)/c with a = 13.7820(11) A, b = 33.598(3) A, c = 16.0575(12) A, alpha = 90 degrees, beta = 98.762(3) degrees, gamma = 90 degrees, Z = 4. Solution phase NMR spectroscopic characterization of this same complex showed a highly symmetric species, consistent with a fluxional coordination environment for these compounds. Preliminary studies into the initiation of epsilon-caprolactone ring-opening polymerization using these complexes indicate high activity, producing high molecular weight polymer.
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| http://dx.doi.org/10.1021/ic8010635 | DOI Listing |
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