Molecular Oligogermanes and Related Compounds: Structure, Optical and Semiconductor Properties

Zaitsev, Kirill V.; Тафеенко, В. А.; Oprunenko, Yuri F.; Kharcheva, Anastasia V.; Zhanabil, Zhaisan; Suleimen, E. M.; Lam, Kevin; Зайцев, В. Б.; Зайцева, А. В.; Зайцева, Г. С.; Karlov, Sergey S.

doi:10.1002/asia.201700151

Cited by 23 publications

(14 citation statements)

References 63 publications

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“…In this case, the elongation of the Ge chain significantly stabilizes the HOMO even in the presence of electron withdrawing substituents. In general, introduction of alkyl or of an electron withdrawing groups into the oligogermane chain stabilizes the HOMO of the oligogermane (as observed earlier for donoracceptor and for oligogermanes fully substituted by acceptor groups [2,13] ) and hence increases the values of the oxidation potential.…”

Section: Electrochemical Behaviormentioning

confidence: 53%

“…It is evident that if alkyl groups are present in oligogermanes, the oxidation potential will higher than for their aryl analogs and in this case it is possible to observe only one wave [28] . Elongation of the Ge chain in 3 in comparison with donor-acceptor digermane Ph3GeGe(C6F5)3 [2] decreases the first oxidation potential (1.53 vs. 1.62 V). Compound 4 has only two oxidation peaks at Epa = 1.18 and 1.38 V vs. Fc + /Fc (1.67 and 1.87 V vs. Ag/AgCl).…”

Section: Electrochemical Behaviormentioning

confidence: 99%

“…Recently, a recent interest has risen for the study of molecular catenated derivatives of Group 14 elements. This phenomenon is driven not only by a pure academic interest [1] , but also by the need for seeking for new useful properties for those compounds [2] . In these compounds the bonding electrons on HOMO orbitals (mainly sp 3 hybridized) are delocalized along the M-M chain, this phenomenon is known as σ-conjugation between the M atoms.…”

Section: Introductionmentioning

confidence: 99%

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Donor-acceptor molecular oligogermanes: Novel properties and structural aspects

Zaitsev

Kharcheva

Lam

et al. 2018

Journal of Organometallic Chemistry

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The linear oligogermyl amide 2, Ph3GeGeMe2NMe2, was obtained by reacting Ph3GeLi with 1, Me2Ge(Cl)NMe2. The amide 2 was used for the synthesis of molecular oligogermanes 3, Ph3GeGeMe2Ge(C6F5)3, and 4, [Ph3GeGeMe2]2Ge(C6F5)2, containing electron donor (Me, Ph) and acceptor (C6F5) groups, by using a hydrogermolysis reaction in n-hexane. The molecular structures of 3 and 4 were studied by XRD. It was shown that, in its crystal form, 3 forms wide channels, in which the solvated nonpolar n-hexane molecule is present. The NMR (1 H, 13 C and 19 F), optical (UV/vis absorption, luminescence) and electrochemical (cyclic voltammetry) properties of both compounds were also studied. The impact of the substitution type (at the end of the compound, such as in 3, or within the compound, such as in 5, on the physical properties was also studied.

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Section: Electrochemical Behaviormentioning

confidence: 53%

Section: Electrochemical Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Donor-acceptor molecular oligogermanes: Novel properties and structural aspects

Zaitsev

Kharcheva

Lam

et al. 2018

Journal of Organometallic Chemistry

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“…From the UV–vis spectrum, it can be seen that the absorption edge of MoS 2 is about 780 nm. According to the formula,

E (ev) = h c / λ

, [ 25,26 ] where E , h , λ , and c are the bandgap energy of the semiconductor material, Planck's constant, wavelength of light, and speed of light, respectively. Therefore, the bandgaps of MoS 2 can be calculated as ≈1.67 eV, which is the same as the previous report.…”

Section: Resultsmentioning

confidence: 99%

Simple Hydrothermal Synthesis of Molybdenum Disulfide and Its Application for a Large‐Area Photodetector

Hou

Liu

Liao

et al. 2020

Crystal Research and Technology

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Here, molybdenum disulfide with graphene‐like structure is prepared by a feasible and simple hydrothermal method. It is also characterized by X‐ray diffraction and a scanning electron microscope to verify the yield and quality of the prepared molybdenum disulfide (MoS2). In addition, a type of photodetector is prepared from the prepared MoS2 as a photosensitive material, and its light response characteristics are explored. The experimental results show that the prepared MoS2 has good photoresponse performance, and it can achieve a photocurrent of 2.40 µA under 660 nm light of 9.85 mW mm−2. At the same time, it shows stable and repeatable light response characteristics at different bending angles. This work is considered as a way to construct a new type of photodetector with a simple manufacturing process and low cost.

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“…16 Extending the types of ligands in the synthesis of catenated derivatives increases the range of substances and their possible application, and it opens new possibilities to study structure–property relationships. Due to σ-conjugation along the E–E bonds, catenated compounds exhibit useful properties, such as luminescence, 17 conductivity, 18 and so on. Therefore, the synthesis of a wide range of catenated hypercoordinated compounds may be regarded as an actual scientific area of interest.…”

Section: Introductionmentioning

confidence: 99%

Hypercoordinated Oligosilanes Based on Aminotrisphenols

et al. 2018

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The hypercoordinated silicon chlorides ClSi[(o-OC6H4)3N] (3) and ClSi[(OC6H2Me2CH2)3N] (5) were used for the synthesis of catenated derivatives (Me3Si)3SiSi[(o-OC6H4)3N] (9), (Me3Si)3SiSiMe2SiMe2Si(SiMe3)2Si[(o-OC6H4)3N] (11), and (Me3Si)3SiSi[(OC6H2Me2CH2)3N] (13) in reactions with (Me3Si)3SiK·THF (7) or (Me3Si)3SiK·[18-crown-6] (8). It was found that the nature of the (Me3Si)3SiK solvate determines the product of interaction, resulting in the formation of (Me3Si)3Si(CH2)4OSi[(OC6H2Me2CH2)3N] (12) or 13. Compounds obtained were characterized using multinuclear NMR and UV–vis spectroscopy and mass spectrometry. The molecular structures of 3, 9, and 11–13 were investigated by single-crystal X-ray analysis, featuring hypercoordinated Si atoms in a trigonal-bipyramidal coordination environment with O atoms in the equatorial plane. The structure of the side product [N(CH2C6H2Me2O)3Si]2O (6) was also studied, indicating highly tetrahedrally distorted trigonal-bipyramidal environment at the Si atoms, which was confirmed by crystal density functional theory calculations indicating the very weak Si ← N interaction. The Si···N interatomic distances span a broad range (2.23–2.78 Å). The dependence of structural and NMR parameters for hypercoordinated catenated compounds from the type of the ligand was established.

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Molecular Oligogermanes and Related Compounds: Structure, Optical and Semiconductor Properties

Abstract: The optical( UV/Vis absorbance, fluorescence in the solid state and in solution) and semiconducting properties of an umber of di-and trigermanes as well as relateds ilicon-andt

Cited by 23 publications

References 63 publications

Donor-acceptor molecular oligogermanes: Novel properties and structural aspects

Donor-acceptor molecular oligogermanes: Novel properties and structural aspects

Simple Hydrothermal Synthesis of Molybdenum Disulfide and Its Application for a Large‐Area Photodetector

Hypercoordinated Oligosilanes Based on Aminotrisphenols

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