Reactivity of Half-Sandwich 16e Carborane Complex Me4CpCo[S2C2B10H10] with Phosphorous Compounds

Treatment of o -carborane, n -butyllithium, sulfur and Me 4 CpCo(CO)I 2 under argon leads to half-sandwich 16e carborane complex Me 4 CpCo[S 2 C 2 B 10 H 10 ]. Me 4 CpCo[S 2 C 2 B 10 H 10 ] reacts with PPh 2 Me, PPhMe 2 , PMe 3 to afford addition products Me 4 CpCo[S 2 C 2 B 10 H 10 ](PPh 2 Me) ( I ), Me 4 CpCo-[S 2 C 2 B 10 H 10 ](PPhMe 2 ) ( II ), Me 4 CpCo[S 2 C 2 B 10 H 10 ](PMe 3 ) ( III ), respectively. I , II and III have been characterized by IR, NMR, elemental analysis, mass spectrum. I and III have also been characterized by single-crystal X-ray diffraction analysis (CCDC nos. 2245287 ( I ) and 2245288 ( III )). The UV and fluorescent spectra properties of the compounds I , II and III have been tested. The UV spectra results of complexes I , II and III in acetonitrile solution show that the bands are located at 412, 399 and 401 nm, respectively. The fluorescence spectra result of the complexes I , II and III exhibit maximum emission peaks at about 405 nm.