H. Mayer, H. Otto, H. Kuehbauch
Jun 14, 1994
Citations
0
Influential Citations
22
Citations
Journal
Journal of Organometallic Chemistry
Abstract
Abstract The novel tridentate phosphine cis , cis -1,3,5-tris(diphenylphosphino)cyclohexane (tdppcy) ( 3 ) has been synthesized. Treatment of tdppcy with Mo(C 7 H 8 )(CO) 3 and Ir(PPh 3 ) 2 (CO)Cl yields octahedral Mo(tdppcy)(CO) 3 ( 4 ) and trigonal-bipyramidal Ir(tdppcy)(CO)Cl ( 5 ), respectively. Compound 5 is transformed into either Ir(tdppcy)(CO)H ( 6 ) or Ir(tdppcy)(CO)(H) 2 + ( 7 ) by treatment with NaBH 4 in refluxing THF. Complex 5 can be oxidized by dichloromethane or Cl 2 to the trichloro complex Ir(tdppcy)Cl 3 ( 8 ), which can be converted into the dihydride Ir(tdppcy)(H) 2 Cl ( 9 ) by treatment with NaBH 4 in THF. The dynamic behavior of the highly fluxional pentacoordinate complexes 5 and 6 has been studied by VT 31 P{ 1 H} NMR spectroscopy. An X-ray diffraction study has been carried out on 8 ·3CH 2 Cl 2 .