Phenylbis(2- pyridyl)phosphine: P- vs. N,N′-coordination in carbonylmolybdenum-(O) and -(II) complexes |
| |
| Authors: | Pablo Espinet Paloma Gomez-Elipe Fernando Villafae |
| |
| Institution: | Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid Spain |
| |
| Abstract: | The first carbonyl molybdenum-(O) and -(II) complexes with phenylbis(2-pyridyl)phosphine (PPhpy2) have been synthesized. PPhpy2 reacts with Mo(CO)5(NCMe)] to give Mo(CO)5(PPhpy2-P)]. With Mo(CO)4(NBD)] (NBD = norbornadiene) it gives Mo(CO)4(PPhpy2-P)2] when a 2 : 1 ratio is used, or MO(CO)4(py2PhP---N,N′)] for a 1 : 1 ratio. Decarbonylation of any of these pyridylphosphine complexes leads to an oligomer of formula {MO(CO)3(μ-PPhpy2)}n, which is also obtained after heating MO(CO)6] in solution with an equimolar amount of PPhpy2. The oligomer undergoes oxidative addition by iodine or allylbromide to give MoI2(CO)3(py2PhP---N,N′)], or MoBr(η3-CH2CHCH2)(CO)2(py2PhP---N,N′)], respectively. These complexes are also obtained by addition of equimolar amounts of PPhpy2 to solutions of MoI2(CO)3(NCMe)2] and MoBr(η3-CH2CH CH2)(CO)2(NCMe)2, respectively. The ligand tends to act as a P-donor towards molybdenum(O) substrates, and as a chelating N,N′-donor in molybdenum (II) complexes. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
