Combining High Electron Affinity and Intramolecular Charge Transfer in 1,3-Dithiole–Nitrofluorene Push–Pull Diads
作者:Dmitrii F. Perepichka、Igor F. Perepichka、Oleksandr Ivasenko、Adrian J. Moore、Martin R. Bryce、Lyudmila G. Kuz'mina、Andrei S. Batsanov、Nikolai I. Sokolov
DOI:10.1002/chem.200701459
日期:2008.3.17
Attaching electron-rich 1,3-dithiol-2-ylidene moieties to polynitrofluorene electron acceptors leads to the formation of highly conjugated compounds 6 to 11, which combinehighelectronaffinity with a pronounced intramolecularchargetransfer (ICT) that is manifested as an intense absorption band in their visible spectra. Such a rare combination of optical and electronic properties is beneficial for
Sequential Functionalisation of Bis-Protected Tetrathiafulvalene-dithiolates
作者:Klaus B. Simonsen、Niels Svenstrup、Jesper Lau、Ole Simonsen、Pernille Mørk、Gitte J. Kristensen、Jan Becher
DOI:10.1055/s-1996-4216
日期:1996.3
The utilisation of the 2-cyanoethyl group as a versatile protecting group for 2-thioxo-1,3-dithiole-4,5-dithiolates and tetrathiafulvalene-thiolates is reported. Mono deprotection of bis-protected 2-thioxo-1,3-dithiole-4,5-dithiolate and of bis-protected tetrathiafulvalene-2,3-dithiolates [obtained by cross coupling of 4,5-bis(2-cyanoethylthio)-1,3-dithio-2-one 5 and the 1,3-dithiole-2-thiones 2b-h and 2j in triethyl phosphite] was achieved in very high yields. The monothiolates were generated from the bis-protected starting materials by selective mono deprotection in dimethylformamide solution using one equivalent of caesium hydroxide monohydrate in methanol. Subsequent quenching with iodomethane gave the resulting methylthio-substituted 1,3-dithiole-2-thione 2i and tetrathiafulvalenes 8 in near quantitative yield. The X-ray crystal structure of the air-stable caesium tetrathiafulvalene-thiolate 10 is reported. This is the first single crystal X-ray structure determination of a tetrathiafulvalene-thiolate.
Properties of Pt(ii) complexes with a sulfur‐rich dithiolate ligand having alkyl chains and of their oxidized species. The X‐ray crystal structure of [NBun4]2[Pt{C6S8(C10H21)2}]
Reactions of [NBu
n
4
]
2
[PtCl
4
] with Na
2
[C
6
S
8
R
2
] [C
6
S
8
R
2
2–
= 2-bis(alkylthio)-1,3-dithiole-2-ylidene}-1,3-dithiole-4,5-dithiolate(2–); R = C
10
H
21
, C
14
H
29
or C
18
H
37
] in methanol afforded [NBu
n
4
]
2
[Pt(C
6
S
8
R
2
)
2
]. The crystal structure of [NBu
n
4
]
2
[PtC
6
S
8
(C
10
H
21
)
2
}
2
] was determined by X-ray analysis. The crystal packing structure consists of columns of anion units assembled through the association of alkyl chains, where the metal-center units are separated by the bulky cations. These complexes exhibit oxidation potentials of –0.25 to +0.35 V vs. SCE. They were oxidized by bromine or iodine to yield essentially two-electron oxidized species [Pt(C
6
S
8
R
2
)
2
]
0
, with ligand-centered oxidation. The oxidized complexes (R = C
10
H
21
and C
14
H
29
) exhibit electrical conductivities (σ) of 1.4 × 10
–2
to 4.9 × 10
–2
S cm
–1
measured for compacted pellets at room temperature, while the oxidized species with R = C
18
H
37
behaves as an insulator (σ < 10
–8
S cm
–1
). Electronic states and molecular interactions of the complexes in the solid state are discussed based on EPR, XPS, electronic absorption and reflectance spectra.
将 [NBu n 4 ] 2 [PtCl 4 ] 与 Na 2 [C 6 S 8 R 2 ] [C 6 S 8 R 2 2- = 2-bis(alkylthio)-1,3-dithiole-2-ylidene}-1,3-dithiole-4,5-dithiolate(2-); R = C 10 H 21, C 14 H 29 或 C 18 H 37 ] 在甲醇中反应,得到 [NBu n 4 ] 2 [Pt(C 6 S 8 R 2 ) 2 ]。通过 X 射线分析确定了 [NBu n 4 ] 2 [PtC 6 S 8 (C 10 H 21 ) 2 } 2 ]的晶体结构。晶体的堆积结构由通过烷基链结合而成的阴离子单元柱组成,其中金属中心单元被大块阳离子隔开。这些复合物对 SCE 的氧化电位为 -0.25 至 +0.35 V。它们在溴或碘的氧化作用下基本上生成了双电子氧化物 [Pt(C 6 S 8 R 2 ) 2 ] 0,并以配体为中心进行氧化。氧化络合物(R = C 10 H 21 和 C 14 H 29)的导电率(σ)为 1.4 × 10 -2 至 4.9 × 10 -2 S cm -1 ,这是室温下对压实颗粒的测量结果,而 R = C 18 H 37 的氧化物则表现为绝缘体(σ < 10 -8 S cm -1 )。根据 EPR、XPS、电子吸收和反射光谱,讨论了固态复合物的电子状态和分子相互作用。
Electroactive Nanowires Based on Simple 4,5-Bis(dodecylthio)- and 4,5-Bis(octadecylthio)-4′,5′-bis(methoxycarbonyl)tetrathiafulvalenes
4,5-Bis(dodecylthio)- and 4,5-bis(octadecylthio)-4′,5′-bis(methoxycarbonyl)tetrathiafulvalenes (1a and 1b) exhibit gelling ability for hexane, cyclohexane, decalin, and diethyl ether to form electr...