π-Olefin-Iridium-Komplexe, XV [1] Kationische Bis(2.3-dimethylbutadien)iridium-L-Verbindungen mit verschiedenen Donorliganden L/π-Olefin Iridium Complexes, XV [1] Cationic Bis(2.3-dimethylbutadiene)iridium-L Compounds with Various Donor Ligands L

Abstract

Abstract (dmb)2IrCH3 (dmb = 2.3-dimethylbuta-1.3-diene) reacts with Ph3CBF4 in CH2Cl2 to form the cation [(dmb)2Ir]+ which crystallizes as the adduct [(dmb)2Ir(OCMe2)]BF4 from acetone solution. The labile acetone ligand is easily displaced by pyridine, cyclohexylisonitrile, phosphane and arsane donor molecules. X-ray diffraction analysis of [(dmb)2Ir(AsPh3)]BF4 reveals tetragonal pyramidal coordination at the iridium atom with the arsane ligand in axial position and with isolated BF4 anions. Spectroscopic data of the new [(dmb)2IrL]BF4 compounds are discussed and related with metal-ligand bond interactions.