Synthesis and characterization of two novel cobalt (II) phosphine complexes: crystal structures of [CoCl3(Cy2PCH2PCy2H)] and [Co(NO3)2(Cy2PCH2PCy2O)]. Cy = cyclohexyl, C6H11 |
| |
| Authors: | Charles E Kriley Luke E Kelvington Stefan J Hershberger Anthony L Silverio Ian P Rothwell |
| |
| Institution: | a Department of Chemistry, Grove City College, 100 Campus Drive, Grove City, PA 16127, USA
b Department of Chemistry, Purdue University, 1393 Brown Building, West Lafayette, IN 47907- 1393, USA |
| |
| Abstract: | The complexes (Cy2PCH2PCy2H)CoCl3] (1) and (Cy2PCH2PCy2O)Co(NO3)2] (2), Cy = cyclohexyl (C6H11), have been prepared and characterized by EPR, UV-Vis, microanalysis and X-ray crystallography. The reaction CoCl2 · 6H2O and dcpm, dcpm = bis(dicyclohexylphosphino)methane, was found to form the monomeric, four coordinate, thermochromic and paramagnetic complex (Cy2PCH2PCy2H)CoCl3] (1). Of particular interest is the formation of a zwitterion, or inner salt, in which the dangling phosphine adds a hydrogen atom, giving the phosphorus a +1 formal charge. The molecule adopts a pseudo-tetrahedral geometry around the central cobalt atom to which the cyclohexyl groups bind in an equatorial fashion to the phosphine. The reaction of Co(NO3)2 · 6H2O and dcpm in a toluene/methanol/methylene chloride mixture yields the pseudo-octahedral complex (Cy2PCH2PCy2O)Co(NO3)2] (2). The cobalt is in the +2 oxidation state with one of the phosphorus atoms again having a +1 formal charge. The complex adopts a pseudo-octahedral geometry around the central cobalt atom with the cyclohexyl groups binding in an equatorial fashion to the phosphine similar to (Cy2PCH2PCy2H)CoCl3]. |
| |
| Keywords: | Crystal structure complexes Cobalt complexes Phosphine complexes |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
