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Four Soft Donors and a Hard Centre: Rhodium Complexes of a Novel Tetrakis(NHC)‐Encapsulated Crown Ether Ligand
Author(s) -
Shrestha Sumi,
GimbertSuriñach Carolina,
Bhadbhade Mohan,
Colbran Stephen B.
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201100656
Subject(s) - chemistry , rhodium , bimetallic strip , crown ether , carbene , ligand (biochemistry) , alkali metal , medicinal chemistry , salt (chemistry) , ether , polymer chemistry , metal , metal ions in aqueous solution , stereochemistry , ion , organic chemistry , catalysis , receptor , biochemistry
Abstract 2,3,13,14‐Tetrakis(bromomethyl)dibenzo‐18‐crown‐6 ( 1 ) has been demonstrated to be a versatile synthetic intermediate for constructing multinucleating ligands with a hard‐donor, crown ether centre. By using this intermediate, novel salts of tetrakis(imidazoliomethyl)dibenzo‐18‐crown‐6, [H 4 L 1 ]X 4 ( 2 : X – = Br – ; 4 : X – = PF 6 – ), and tetrakis(benzimidazoliomethyl)dibenzo‐18‐crown‐6, [H 4 L 2 ]X 4 ( 3 : X – = Br – ; 5 : X – = PF 6 – ), were prepared. These salts are precursors to novel tetrakis(N‐heterocyclic carbene) complexes spanned by a crown ether bridge capable of binding various hard metal ions. Thetetrakis(imidazoliomethyl) salt 4 was used to prepare the bimetallic rhodium complexes [{(cod)Rh} 2 (μ‐L 1 )][PF 6 ] 2 ( 6 ) and [{(CO) 2 Rh} 2 (μ‐L 1 )][PF 6 ] 2 ( 7 ). These complexes selectively bind alkali metal ions.