| Autor: |
Novák, Miroslav, Turek, Jan, Milasheuskaya, Yaraslava, Růηičková, Zdeňka, Podzimek, Štěpán, Jambor, Roman |
| Předmět: |
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| Zdroj: |
Dalton Transactions: An International Journal of Inorganic Chemistry; 11/28/2021, Vol. 50 Issue 44, p16039-16052, 14p |
| Abstrakt: |
α-Iminopyridine ligands L1 (2-(CH＝N(C6H2-2,4,6-Ph3))C5H4N), L2 (2-(CH＝N(C6H2-2,4,6-tBu3))C5H4N) and L3 (1,2-(C5H4N-2-CH＝N)2CH2CH2) differing by the steric demand of the substituent on the imine CH＝N group and by the number of donating nitrogen atoms were utilized to initiate a Lewis base mediated ionization of SnCl2 in an effort to prepare ionic tin(II) species [L1–3 → SnCl][SnCl3]. The reaction of L1 and L2 with SnCl2 led to the formation of neutral adducts [L1 → SnCl2] (2) and [L2 → SnCl2] (3). The preparation of the desired ionic compounds was achieved by subsequent reactions of 2 and 3 with an equivalent of SnCl2 or GaCl3. In contrast, ligand L3 containing four donor nitrogen atoms showed the ability to ionize SnCl2 and also Sn(OTf)2, yielding [L3 → SnCl][SnCl3] (7) and [L3 → Sn(H2O)][OTf]2 (8). The study thus revealed that the reaction is dependent on the type of the ligand. The prepared complexes 4–8 together with the previously reported [{2-((CH3)C＝N(C6H3-2,6-iPr2))-6-CH3O-C5H3N}SnCl][SnCl3] (1) were tested as catalysts for the ROP of L -lactide, which could operate via an activated monomer mechanism. Finally, a DFT computational study was performed to evaluate the steric and electronic properties of the ionic tin(II) species 1 and 4–8 together with their ability to interact with the L -lactide monomer. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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