Abstract
The synthesis of gold(I) complexes of 2,5-diferrocenyl-1-phenyl-1H-phosphole (1) is presented. Chloro(2,5-diferrocenyl-1-phenyl-1H-phosphole) gold (3) has successfully been prepared by the reaction of 1 with AuCl(SMe2) (2). Treatment of 2 with arylethyne (aryl = ferrocenyl, phenyl) using catalytical amounts of [CuI] and 1 equiv. of 1 gave arylethynyl-(2,5-diferrocenyl-1-phenyl-1H-phosphole)gold 4a and 4b (aryl: a = ferrocenyl; b = phenyl). Compound [mu-(1,4-phenylenedi-2,1-ethynediyl)]bis(2,5-diferrocenyl-1-phenyl-1H-phosphole)digold (5) could be synthesized by a similar procedure using 0.5 equiv. of 1,4-diethynylbenzene. The electrochemical properties of 3, 4a, b and 5 were investigated by cyclic and square wave voltammetry. In 3, 4a and 4b each ferrocenyl unit shows one reversible redox event with redox separations of the ferrocenyl moieties in 2,5 position of approximately 260 mV. In 5 two redox events for the four ferrocenyl groups were observed. Spectroelectrochemical measurements of 3, 4a and 4b reveal IVCT absorptions with intensities of 1100-1300 L mol(-1) cm(-1) and a full-width-at-half-height of approximate to 3650 cm(-1). In 5 two mixed-valent units are present per molecule and therefore, the intensity of the IVCT band is increased to 2700 L mol(-1) cm(-1). Compounds 3, 4a, b and 5 can be classified as moderately coupled class II systems according to Robin and Day. The complexation of the gold(I) fragment by the phosphorus atom leads to a decreased metal-metal interaction when compared to 1. (C) 2015 Elsevier B.V. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 104-110 |
| Number of pages | 7 |
| Journal | Journal of Organometallic Chemistry |
| Volume | 803 |
| DOIs | |
| Publication status | Published - 1 Feb 2016 |
| Externally published | Yes |
Cite this
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Electronic interactions in gold(I) complexes of 2,5-diferrocenyl-1-phenyl-1H-phosphole. / Miesel, Dominique; Hildebrandt, Alexander; Korb, Marcus; Lang, Heinrich.
In: Journal of Organometallic Chemistry, Vol. 803, 01.02.2016, p. 104-110.Research output: Contribution to journal › Article
TY - JOUR
T1 - Electronic interactions in gold(I) complexes of 2,5-diferrocenyl-1-phenyl-1H-phosphole
AU - Miesel, Dominique
AU - Hildebrandt, Alexander
AU - Korb, Marcus
AU - Lang, Heinrich
PY - 2016/2/1
Y1 - 2016/2/1
N2 - The synthesis of gold(I) complexes of 2,5-diferrocenyl-1-phenyl-1H-phosphole (1) is presented. Chloro(2,5-diferrocenyl-1-phenyl-1H-phosphole) gold (3) has successfully been prepared by the reaction of 1 with AuCl(SMe2) (2). Treatment of 2 with arylethyne (aryl = ferrocenyl, phenyl) using catalytical amounts of [CuI] and 1 equiv. of 1 gave arylethynyl-(2,5-diferrocenyl-1-phenyl-1H-phosphole)gold 4a and 4b (aryl: a = ferrocenyl; b = phenyl). Compound [mu-(1,4-phenylenedi-2,1-ethynediyl)]bis(2,5-diferrocenyl-1-phenyl-1H-phosphole)digold (5) could be synthesized by a similar procedure using 0.5 equiv. of 1,4-diethynylbenzene. The electrochemical properties of 3, 4a, b and 5 were investigated by cyclic and square wave voltammetry. In 3, 4a and 4b each ferrocenyl unit shows one reversible redox event with redox separations of the ferrocenyl moieties in 2,5 position of approximately 260 mV. In 5 two redox events for the four ferrocenyl groups were observed. Spectroelectrochemical measurements of 3, 4a and 4b reveal IVCT absorptions with intensities of 1100-1300 L mol(-1) cm(-1) and a full-width-at-half-height of approximate to 3650 cm(-1). In 5 two mixed-valent units are present per molecule and therefore, the intensity of the IVCT band is increased to 2700 L mol(-1) cm(-1). Compounds 3, 4a, b and 5 can be classified as moderately coupled class II systems according to Robin and Day. The complexation of the gold(I) fragment by the phosphorus atom leads to a decreased metal-metal interaction when compared to 1. (C) 2015 Elsevier B.V. All rights reserved.
AB - The synthesis of gold(I) complexes of 2,5-diferrocenyl-1-phenyl-1H-phosphole (1) is presented. Chloro(2,5-diferrocenyl-1-phenyl-1H-phosphole) gold (3) has successfully been prepared by the reaction of 1 with AuCl(SMe2) (2). Treatment of 2 with arylethyne (aryl = ferrocenyl, phenyl) using catalytical amounts of [CuI] and 1 equiv. of 1 gave arylethynyl-(2,5-diferrocenyl-1-phenyl-1H-phosphole)gold 4a and 4b (aryl: a = ferrocenyl; b = phenyl). Compound [mu-(1,4-phenylenedi-2,1-ethynediyl)]bis(2,5-diferrocenyl-1-phenyl-1H-phosphole)digold (5) could be synthesized by a similar procedure using 0.5 equiv. of 1,4-diethynylbenzene. The electrochemical properties of 3, 4a, b and 5 were investigated by cyclic and square wave voltammetry. In 3, 4a and 4b each ferrocenyl unit shows one reversible redox event with redox separations of the ferrocenyl moieties in 2,5 position of approximately 260 mV. In 5 two redox events for the four ferrocenyl groups were observed. Spectroelectrochemical measurements of 3, 4a and 4b reveal IVCT absorptions with intensities of 1100-1300 L mol(-1) cm(-1) and a full-width-at-half-height of approximate to 3650 cm(-1). In 5 two mixed-valent units are present per molecule and therefore, the intensity of the IVCT band is increased to 2700 L mol(-1) cm(-1). Compounds 3, 4a, b and 5 can be classified as moderately coupled class II systems according to Robin and Day. The complexation of the gold(I) fragment by the phosphorus atom leads to a decreased metal-metal interaction when compared to 1. (C) 2015 Elsevier B.V. All rights reserved.
KW - Heterocycle
KW - Electrochemistry
KW - Electron transfer
KW - Phosphole
KW - UNSATURATED HYDROCARBON BRIDGES
KW - TRANSITION-METAL-COMPLEXES
KW - SOLID-STATE
KW - ALKYNYLGOLD(I) COMPLEXES
KW - ORGANOMETALLIC COMPLEXES
KW - 5-MEMBERED HETEROCYCLES
KW - CHARGE-TRANSFER
KW - BUILDING-BLOCK
KW - PHOSPHOLE
KW - ELECTROCHEMISTRY
U2 - 10.1016/j.jorganchem.2015.12.014
DO - 10.1016/j.jorganchem.2015.12.014
M3 - Article
VL - 803
SP - 104
EP - 110
JO - Journal of Organometallic Chemistry
JF - Journal of Organometallic Chemistry
SN - 0022-328X
ER -