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Preparation and Structure of Mono‐ and Binuclear Half‐Sandwich Iridium, Ruthenium, and Rhodium Carbene Complexes Containing 1,2‐Dichalcogenolao 1,2‐Dicarba‐ closo ‐Dodecaboranes
Author(s) -
Wang Xin,
Liu Shuang,
Weng LinHong,
Jin GuoXin
Publication year - 2006
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200600854
Subject(s) - carbene , chemistry , iridium , rhodium , ruthenium , ligand (biochemistry) , methylene , medicinal chemistry , transition metal , stereochemistry , carborane , nuclear magnetic resonance spectroscopy , catalysis , organic chemistry , biochemistry , receptor
The synthesis of half‐sandwich transition metal complexes containing both 1,2‐dichalcogenolato‐1,2‐dicarba‐ closo ‐docecaborane (Cab E,E ) [Cab E,E =E 2 C 2 (B 10 H 10 ); E = S, Se] and N‐heterocyclic carbene (NHC) ligands is described. Addition of mono‐NHC ligand to the 16e half‐sandwich dichalcogenolato carborane complexes [Cp*Rh(Cab E,E )], [Cp*Ir(Cab S,S )], [( p ‐cymene)Ru(Cab S,S )] (Cp* = pentamethylcyclopentadienyl) gives corresponding mononuclear 18e dithiolate complexes of the type [LM(Cab E,E )(NHC)]: [Cp*M(Cab S,S )(1‐ethenyl‐3‐methylimidazolin‐2‐ylidene)] (M = Ir ( 2 ), Rh ( 3 )), [Cp*Rh(Cab E,E )(3‐methyl‐1‐picolyimidazolin‐2‐ylidene)] [E = S ( 6 ), Se ( 7 )], [( p ‐cymene)Ru(Cab S,S )(NHC)] [NHC = 1‐ethenyl‐3‐methylimidazolin‐2‐ylidene ( 4 ), 3‐methyl‐1‐picolyimidazolin‐2‐ylidene ( 8 )], whereas bis‐NHC give centrosymmetric binuclear complexes [{Cp*M(Cab S,S )} 2 (1,1′‐dimethyl‐3,3′‐methylene(imidazolin‐2‐ylidene))] [M = Rh ( 10 ), Ir ( 11 )]. The complexes were characterized by IR, NMR spectroscopy and elemental analysis. In addition, X‐ray structure analyses were performed on complexes 2 – 4 , 6 , 8 , 10 and 11 .