scholarly journals Poly(dimethylsiloxane) and oligo(dimethylsiloxane) solvent effects on aromatic donor–acceptor interactions

2021 ◽  
Author(s):  
Shogo Amemori ◽  
Kyoka Kikuchi ◽  
Motohiro Mizuno
Keyword(s):  
Solvent Effects ◽  
Aromatic Donor ◽  
Donor Acceptor

Dimethylsiloxane solvents strengthened the donor–acceptor interactions between pyrene and pyromellitic diimide derivatives and were compared with aliphatic solvents.

Homoleptic 2,2′-bipyridine metalates(–I) of iron and cobalt, one cocrystallized with an anthracene radical anion and the other with neutral anthracene

2014 ◽  
Vol 70 (8) ◽  
pp. 828-832
Author(s):  
William W. Brennessel ◽  
John E. Ellis
Keyword(s):  
Radical Anion ◽  
Complex Cation ◽  
Solvent Molecule ◽  
Inversion Center ◽  
Asymmetric Unit ◽  
Aromatic Donor ◽  
Donor Acceptor ◽  
Anthracene Molecule ◽  
Packing Arrangement ◽  
Solvent Molecules

Homoleptic 2,2′-bipyridine (bipy) metalates of iron and cobalt have been synthesized directly from the corresponding homoleptic anthracene metalates. In the iron structure, bis[([2.2.2]cryptand)potassium(I)] tris(2,2′-bipyridine)ferrate(–I) anthracene(–I), [K(C18H36N2O6)]2[Fe(C10H8N2)3](C14H10), the asymmetric unit contains one potassium complex cation in a general position, the Fe center and one and a half bipy ligands of the ferrate complex on a crystallographic twofold axis that includes the Fe atom, and one half of an anthracene radical anion whose other half is generated by a crystallographic inversion center. The cations and anions are well separated and the geometry about the Fe center is essentially octahedral. In the cobalt structure, ([2.2.2]cryptand)potassium(I) bis(2,2′-bipyridine)cobaltate(–I) anthracene hemisolvate tetrahydrofuran (THF) disolvate, [K(C18H36N2O6)][Co(C10H8N2)2]·0.5C14H10·2C4H8O, the asymmetric unit contains the cation, anion, and both cocrystallized THF solvent molecules in general positions, and one half of a cocrystallized anthracene molecule whose other half is generated by a crystallographic inversion center. The cation and anion are well separated and the ligand planes in the cobaltate anion are periplanar. Each anthracene molecule is midway between and is oriented perpendicular to a pair of symmetry-related bipy ligands such that aromatic donor–acceptor interactions may play a role in the packing arrangement. The lengths of the bonds that connect the bipy rings support the assertion that the ligands are bipy radical anions in the iron structure. However, in the case of cobalt, these lengths are between the known ranges for a bipy radical anion and a bipy dianion, and therefore no conclusion can be made from the crystallography alone. One cocrystallized THF solvent molecule in the cobalt structure was modeled as disordered over three positions with appropriate geometric and thermal restraints, which resulted in a refined component mass ratio of 0.412 (4):0.387 (3):0.201 (3).

Raising the Bar in Aromatic Donor–Acceptor Interactions with Cyclic Trinuclear Gold(I) Complexes as Strong π-Donors

2018 ◽  
Vol 140 (51) ◽  
pp. 17932-17944 ◽  
Author(s):  
Raiko Hahn ◽  
Fabian Bohle ◽  
Wenwen Fang ◽  
Andreas Walther ◽  
Stefan Grimme ◽  
...  
Keyword(s):  
Aromatic Donor ◽  
Donor Acceptor

Aromatic donor–acceptor interaction promoted catalyst assemblies for hydrolytic kinetic resolution of epichlorohydrin

2019 ◽  
Vol 17 (1) ◽  
pp. 172-180 ◽  
Author(s):  
Daniel R. Blechschmidt ◽  
Matthew D. Woodhouse ◽  
Sebastien Inagaki ◽  
Melita Whitfield ◽  
Ayokunnumi Ogunsanya ◽  
...  
Keyword(s):  
Kinetic Resolution ◽  
Catalyst Activity ◽  
Acceptor Interaction ◽  
Hydrolytic Kinetic Resolution ◽  
Aromatic Donor ◽  
Donor Acceptor

The catalyst activity of bis-acceptor functionalized Co(iii)–salen in hydrolytic kinetic resolution can be fine-tuned by introducing a proper donor compound.

scholarly journals SNAr catalysis enhanced by an aromatic donor–acceptor interaction; facile access to chlorinated polyfluoroarenes

2017 ◽  
Vol 53 (54) ◽  
pp. 7545-7548 ◽  
Author(s):  
Sameera Senaweera ◽  
Jimmie D. Weaver
Keyword(s):  
Acceptor Interaction ◽  
Aromatic Donor ◽  
Donor Acceptor

The use of TMSCl skews the thermodynamics of the Halex reaction, allowing catalysis and access to functionalized fluoroarenes.

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