Heterobimetallic Fe–Pd and Fe–Pt NCN pincer complexes (NCN=[C6H2(CH2NMe2)2-2,6]−)
摘要:
The meta-diaminoaryl ferrocenes Fc-NCN-H (3) and Fc-C C-NCN-H (5) (Fc = (eta(5)-C5H5)(eta(5)-C5H4)Fe, NCN-H = C6H3(CH2NMe2)(2)-3,5) can be used as precursors in the preparation of heterobimetallic transition metal complexes of structural type Fc-NCN-MX (NCN = [C6H2(CH2NMe2)(2)-2,6](-); MX = PdCl (7), PtCl (8), PtI (9)) and Fc-C C-NCN-MX (MX = PdCl (11), PdI (12), PtCl (13)), respectively. They are accessible by applying different synthesis procedures, including oxidative addition and metallation-transmetallation processes.Cyclovoltammetric studies show that the ferrocene moieties in 3, 5, 7-9 and 11-13 can reversibly be oxidised. The potential of the Fe(II)/Fe(III) redox couple decreases with increasing electron density at the NCN pincer unit. The use of 8 as a possible (electro)chemical sensor in the detection of SO, is discussed as well.The solid-state structures of 8 and 13 are reported. The crystals of 8 contain two molecules of 8 in the asymmetric unit. The plane of the C6H2 moiety is with 27.2(3)degrees and 38.2(3)degrees tilted towards the C5H4 entity, while in 13 an angle of 45.9(3)degrees can be found. The d(8)-electron configured platinum atoms possess a somewhat distorted square-planar surrounding, setup by two Me2NCH2 ortho-substituents, the NCN C-ipso carbon atom and the chloride ligand. (c) 2006 Elsevier B.V. All rights reserved.
Heterobimetallic Fe–Pd and Fe–Pt NCN pincer complexes (NCN=[C6H2(CH2NMe2)2-2,6]−)
摘要:
The meta-diaminoaryl ferrocenes Fc-NCN-H (3) and Fc-C C-NCN-H (5) (Fc = (eta(5)-C5H5)(eta(5)-C5H4)Fe, NCN-H = C6H3(CH2NMe2)(2)-3,5) can be used as precursors in the preparation of heterobimetallic transition metal complexes of structural type Fc-NCN-MX (NCN = [C6H2(CH2NMe2)(2)-2,6](-); MX = PdCl (7), PtCl (8), PtI (9)) and Fc-C C-NCN-MX (MX = PdCl (11), PdI (12), PtCl (13)), respectively. They are accessible by applying different synthesis procedures, including oxidative addition and metallation-transmetallation processes.Cyclovoltammetric studies show that the ferrocene moieties in 3, 5, 7-9 and 11-13 can reversibly be oxidised. The potential of the Fe(II)/Fe(III) redox couple decreases with increasing electron density at the NCN pincer unit. The use of 8 as a possible (electro)chemical sensor in the detection of SO, is discussed as well.The solid-state structures of 8 and 13 are reported. The crystals of 8 contain two molecules of 8 in the asymmetric unit. The plane of the C6H2 moiety is with 27.2(3)degrees and 38.2(3)degrees tilted towards the C5H4 entity, while in 13 an angle of 45.9(3)degrees can be found. The d(8)-electron configured platinum atoms possess a somewhat distorted square-planar surrounding, setup by two Me2NCH2 ortho-substituents, the NCN C-ipso carbon atom and the chloride ligand. (c) 2006 Elsevier B.V. All rights reserved.
Organometallic π-Tweezers, NCN Pincers, and Ferrocenes as Molecular “Tinkertoys” in the Synthesis of Multiheterometallic Transition-Metal Complexes
作者:Heinrich Lang、Rico Packheiser、Bernhard Walfort
DOI:10.1021/om058042p
日期:2006.4.1
describes the synthesis, reaction chemistry, structures, and bonding of early−late heterodi-, heterotri-, and heterotetrametallic transition-metal complexes by applying the molecular “Tinkertoy” approach. As connecting units between the different metal atoms, π-conjugated carbon-rich organic and/or inorganic groups can be used. The electrochemical behavior of such one-dimensional molecular wire molecules