EPR Study of Photochemical Reactions of fac- and mer-[Cr(CO)3(1-L2)(
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- 作者：Anne L. Rieger and Philip H. Rieger
- 刊名：Organometallics
- 出版年：2002
- 出版时间：December 23, 2002
- 年：2002
- 卷：21
- 期：26
- 页码：5868 - 5873
- 全文大小：112K
- 年卷期：v.21,no.26(December 23, 2002)
- ISSN：1520-6041
文摘
Rearrangement of fac-[Cr(CO)3(
2-L2)(1-L2)]+ to mer-[Cr(CO)3(2-L2)(1-L2)]+ (L2 is abidentate phosphine or arsine ligand) is a rapid thermally activated process. Loss of COfrom mer-[Cr(CO)3(2-L2)(1-L2)]+ to form trans-[Cr(CO)2(2-L2)2]+ is shown to be a cleanphotochemical process, perhaps the first example of a quantitative photochemical transformation for a Cr(I) complex. The bidentate phosphonite ligand, L2 = (MeO)2PCH2CH2P(OMe)2,behaves quite differently: fac-[Cr(CO)3(2-L2)(1-L2)]+ undergoes photochemical loss of COto form a five-coordinate complex which converts slowly via thermal activation to trans-[Cr(CO)2(2-L2)2]+.
2-L2)(1-L2)]+ to mer-[Cr(CO)3(2-L2)(1-L2)]+ (L2 is abidentate phosphine or arsine ligand) is a rapid thermally activated process. Loss of COfrom mer-[Cr(CO)3(2-L2)(1-L2)]+ to form trans-[Cr(CO)2(2-L2)2]+ is shown to be a cleanphotochemical process, perhaps the first example of a quantitative photochemical transformation for a Cr(I) complex. The bidentate phosphonite ligand, L2 = (MeO)2PCH2CH2P(OMe)2,behaves quite differently: fac-[Cr(CO)3(2-L2)(1-L2)]+ undergoes photochemical loss of COto form a five-coordinate complex which converts slowly via thermal activation to trans-[Cr(CO)2(2-L2)2]+.