TY - JOUR
T1 - One-step synthesis of heteroleptic rare-earth amide complexes featuring fluorenyl-tethered N-heterocyclic carbene ligands
AU - Evans, Kieren
AU - Morton, Paul A.
AU - Sangster, Calum
AU - Mansell, Stephen M.
N1 - Funding Information:
The authors would like to thank the EPSRC (DTP studentships to K. J. E. and P. A. M.) for funding.
Publisher Copyright:
© 2021 Elsevier Ltd
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/3/15
Y1 - 2021/3/15
N2 - Reaction of the fluorenyl-tethered imidazolium bromide salt [9-(C13H9)C2H4N(CH)C2H2N(Me)][Br] (I) with [Y{N(SiMe3)2}3] generated the heteroleptic yttrium complex [Y{(η5-C13H8)C2H4N(κ-C)C2H2N(Me)}(Br){N(SiMe3)2}] (1), which contains an Y centre with a piano stool geometry and four different donors. The reaction of I with [Nd{N(SiMe3)2}3] led to single crystals of the dimeric Nd complex [Nd{(η5-C13H8)C2H4N(κ-C)C2H2N(Me)}(μ-Br){N(SiMe3)2}]2 (2), likely due to the larger ionic radius of Nd3+. Reactions of I with [La{N(SiMe3)2}3], which contains the larger La3+ ion, demonstrated the formation of multiple products from ligand redistribution, including [La{(η5-C13H8)C2H4N(κ-C)C2H2N(Me)}{N(SiMe3)2}2] (3) and [La{(η5-C13H8)C2H4N(κ-C)C2H2N(Me)}2(Br)] (4).
AB - Reaction of the fluorenyl-tethered imidazolium bromide salt [9-(C13H9)C2H4N(CH)C2H2N(Me)][Br] (I) with [Y{N(SiMe3)2}3] generated the heteroleptic yttrium complex [Y{(η5-C13H8)C2H4N(κ-C)C2H2N(Me)}(Br){N(SiMe3)2}] (1), which contains an Y centre with a piano stool geometry and four different donors. The reaction of I with [Nd{N(SiMe3)2}3] led to single crystals of the dimeric Nd complex [Nd{(η5-C13H8)C2H4N(κ-C)C2H2N(Me)}(μ-Br){N(SiMe3)2}]2 (2), likely due to the larger ionic radius of Nd3+. Reactions of I with [La{N(SiMe3)2}3], which contains the larger La3+ ion, demonstrated the formation of multiple products from ligand redistribution, including [La{(η5-C13H8)C2H4N(κ-C)C2H2N(Me)}{N(SiMe3)2}2] (3) and [La{(η5-C13H8)C2H4N(κ-C)C2H2N(Me)}2(Br)] (4).
KW - F-block organometallics
KW - Fluorenyl-tethered NHCs
KW - Heteroleptic rare-earth complexes
KW - NHC ligands
UR - http://www.scopus.com/inward/record.url?scp=85100215514&partnerID=8YFLogxK
U2 - 10.1016/j.poly.2021.115021
DO - 10.1016/j.poly.2021.115021
M3 - Article
SN - 0277-5387
VL - 197
JO - Polyhedron
JF - Polyhedron
M1 - 115021
ER -