Sandwich and half-sandwich metal complexes derived from cross-conjugated 3-methylene-penta-1,4-diynes.
Sandwich and half-sandwich metal complexes derived from cross-conjugated 3-methylene-penta-1,4-diynes.
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源自交叉共轭 3-亚甲基-五-1,4-二炔的夹心和半夹心金属配合物。
DOI:
10.1039/c6dt04470k
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Vincent KB
中科院分区:
文献类型:
--
作者:
Vincent KB
The cross-conjugated ethynyl–vinylidene [Ph2CC(CCH){C(H)CRu(PPh3)2Cp}]PF6 ([4a]PF6), and [FcC(H)C(CCH){C(H)CRu(PPh3)2Cp}]PF6 ([4b]PF6), and ethynyl–alkynyl Ph2CC(CCH){CCRu(PPh3)2Cp} (5a), and FcC(H)C(CCH){CCRu(PPh3)2Cp} (5b) compounds (Cp = η5-cyclopentadienyl) have been prepared from reactions of the known 3-methylene-penta-1,4-diynes Ph2CC(CCH)2 (3a) and [FcCHC(CCH)2] (3b) with [RuCl(PPh3)2Cp]. The compounds derived from 3b incorporating the more electron-rich alkene proved to be unstable during work-up, and attempts to prepare bis(ruthenium) complexes from 3a and 3b or from transmetallation reactions of the bis(alkynylgold) complex FcCHC(CCAuPPh3)2 (7) with RuCl(PPh3)2Cp were unsuccessful. The related bis- and tris(ferrocenyl) derivatives Ph2CC(CCFc)2 (6a) and FcCHC(CCFc)2 (6b) were more readily obtained from Pd(II)/Cu(I) catalysed cross-coupling reactions of FcCCH with the 1,1-dibromo vinyl complexes PhCCBr2 (1a) and FcC(H)CBr2 (1b). Cyclic voltammetry of 6a and 6b using n-Bu4N[PF6] as the supporting electrolyte shows broad, overlapping waves arising from the sequential oxidation of the ferrocenyl moieties in electronically and chemically similar environments. Electrostatic effects between the ferrocenyl moieties are enhanced in solutions of the weakly ion-pairing electrolyte n-Bu4N[B{C6H3(CF3)2-3,5}4], leading to better resolution of the individual electrochemical processes. The comparative IR spectroelectrochemical response of 6a and 6b suggest the vinyl ferrocene moiety in 6b undergoes oxidation before the ethynyl ferrocene fragments. There is no evidence of electronic coupling between the metallocene moieties and [6a]+, [6b]n+ (n = 1, 2) are best described as Class I mixed-valence compounds.
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影响因子:
2.5
作者:
J. Maurer;R. Winter;B. Sarkar;S. Záliš
通讯作者:
J. Maurer;R. Winter;B. Sarkar;S. Záliš
影响因子:
4.9
作者:
James N. Wilson;M. Josowicz;Yi;U. Bunz
通讯作者:
U. Bunz
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
S. Natoli;Timothy D. Cook;Tara R. Abraham;John J Kiernicki;P. Fanwick;T. Ren
通讯作者:
T. Ren
DOI:
10.1002/9780470132579.ch59
发表时间:
1989-01-01
期刊:
INORGANIC SYNTHESES
影响因子:
--
作者:
BRUCE, MI;NICHOLSON, BK;HENLY, T
通讯作者:
HENLY, T
影响因子:
2.8
作者:
M. Bruce;Aléxandre Burgun;M. A. Fox;M. Jevric;P. Low;B. K. Nicholson;C. R. Parker;B. Skelton
通讯作者:
M. Bruce;Aléxandre Burgun;M. A. Fox;M. Jevric;P. Low;B. K. Nicholson;C. R. Parker;B. Skelton