Sc3+ Chloro and Alkyl Complexes Coordinated by Pincer NHC-Tethered Bis(phenolate) Ligands |
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| Authors: | Galina A Gurina Prof?Dr Alexey V Markin Anton V Cherkasov Ivan A Godovikov Dr Anatoly M Ob'edkov Prof?Dr Alexander A Trifonov |
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| Institution: | 1. N.?I. Lobachevsky Nizhny, Novgorod State University, 23 prosp. Gagarina, 603022 Nizhny Novgorod, Russia;2. Institute of Organometallic Chemistry of, Russian Academy of Sciences, 49 Tropinina str., GSP-445, 630950 Nizhny Novgorod, Russia;3. Institute of Organoelement Compounds of, Russian Academy of Sciences, 28 Vavilova str., 119334 Moscow, Russia |
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| Abstract: | Bis(phenolate) ligands with benzimidazole-2-ylidene ( L1) and tetrahydropyrimidine-2-ylidene ( L2 ) linkers proved to be suitable coordination environments for the synthesis of isolable Sc3+ chloro and alkyl complexes. The treatment of Sc(CH2SiMe3)3(THF)2 with equimolar amounts of L1,2H3 ] Cl afforded chloro complexes L1,2ScCl ( solv ) 2 (solv=THF, Py) in 76–85 % yields. L1,2ScCl ( THF ) 2 were also prepared by the salt metathesis reactions of ScCl3 with L1,2 ] Na2 generated from L1,2H3 ] Cl and 3 equiv. of NaN(SiMe3)2 (?40 °C, THF) and isolated in somewhat lower yields (68–73 %). L2ScCl ( THF ) 2 was subjected to the alkylation reaction with LiCH2SiMe3 affording alkyl derivative L2Sc ( CH2SiMe3 )] 2 . This compound can be alternatively prepared by the subsequent reactions of L2H3 ] Cl with equimolar amount of NaN(SiMe3)2 and Sc(CH2SiMe3)3(THF)2. In the dimeric alkyl compound L2Sc ( CH2SiMe3 )] 2 , one of the phenoxide groups of the dianionic ligand is coordinated to one scandium center, while the second one features μ-bridging coordination with two metal centers. |
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| Keywords: | N-heterocyclic carbenes phenol pincer ligands rare-earth elements scandium |
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