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New Horizons in Silicon Chemistry
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New Horizons in Silicon Chemistry

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Macromolecules".

Deadline for manuscript submissions: 30 September 2024 | Viewed by 1513

Special Issue Editor

Prof. Dr. Mitsuo Kira

E-Mail Website
Guest Editor
Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan
Interests: silicon chemistry; organometallic chemistry; physical organic chemistry; theoretical organometallic chemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Basic silicon chemistry has developed remarkably since the first isolation of a silicon–silicon double-bonded molecule, tetramesityldisilene, by the late Prof. Robert West et al. in 1981. Today, a variety of silicon unsaturated compounds, such as silylenes, silaethenes, disilynes, and silanones, are available as isolable compounds, and their unique structures, bonding, electronic features, and reactions have been revealed. A multifaceted and balanced development of both basic and applied silicon chemistry is now required. This Special Issue provides a platform for the discussion of every aspect of molecular silicon and related germanium, tin, and lead compounds, including their synthesis, spectroscopic properties, theoretical calculations, reactions and mechanisms, and industrial applications.

Prof. Dr. Mitsuo Kira
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. There is an Article Processing Charge (APC) for publication in this open access journal. For details about the APC please see here. Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • synthesis
  • bonding and structures
  • reaction mechanism
  • physical properties
  • application
  • germanium
  • tin

Published Papers (2 papers)

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Research

15 pages, 2769 KiB  
Article
Approach to the “Missing” Diarylsilylene: Formation, Characterization, and Intramolecular C–H Bond Activation of Blue Diarylsilylenes with Bulky Rind Groups
by Kazuki Mochihara, Tatsuto Morimoto, Kei Ota, Shinsuke Marumoto, Daisuke Hashizume and Tsukasa Matsuo
Int. J. Mol. Sci. 2024, 25(7), 3761; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms25073761 - 28 Mar 2024
Viewed by 408
Abstract
The treatment of the bulky Rind-based dibromosilanes, (Rind)2SiBr2 (2) [Rind = 1,1,7,7-tetra-R1-3,3,5,5-tetra-R2-s-hydrindacen-4-yl: EMind (a: R1 = Et, R2 = Me) and Eind (b: R1 = [...] Read more.
The treatment of the bulky Rind-based dibromosilanes, (Rind)2SiBr2 (2) [Rind = 1,1,7,7-tetra-R1-3,3,5,5-tetra-R2-s-hydrindacen-4-yl: EMind (a: R1 = Et, R2 = Me) and Eind (b: R1 = R2 = Et)], with two equivalents of tBuLi in Et2O at low temperatures resulted in the formation of blue solutions derived from the diarylsilylenes, (Rind)2Si: (3). Upon warming the solutions above −20 °C, the blue color gradually faded, accompanying the decomposition of 3 and yielding cyclic hydrosilanes (4) via intramolecular C–H bond insertion at the Si(II) center. The molecular structures of the bulky Eind-based 3b and 4b were confirmed by X-ray crystallography. Thus, at −20 °C, blue crystals were formed (Crystal-A), which were identified as mixed crystals of 3b and 4b. Additionally, colorless crystals of 4b as a singular component were isolated (Crystal-B), whose structure was also determined by an X-ray diffraction analysis. Although the isolation of 3 was difficult due to their thermally labile nature, their structural characteristics and electronic properties were discussed based on the experimental findings complemented by computational results. We also examined the hydrolysis of 3b to afford the silanol, (Eind)2SiH(OH) (5b). Full article
(This article belongs to the Special Issue New Horizons in Silicon Chemistry)
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14 pages, 8365 KiB  
Article
Green Synthesis of Soluble Polysilsesquioxane with Phthalimide Groups
by Artem I. Emel’yanov, Yuliya I. Bolgova, Olga M. Trofimova and Alexander S. Pozdnyakov
Int. J. Mol. Sci. 2024, 25(1), 57; https://0-doi-org.brum.beds.ac.uk/10.3390/ijms25010057 - 19 Dec 2023
Viewed by 807
Abstract
Soluble polysilsesquioxane containing side-chain phthalimide groups (PSQ-PhI) was synthesized via a solvent- and catalyst-free hydrolytic polycondensation reaction using 2-[3-(triethoxysilyl)propyl]-1H-isoindole-1,3(2H)-dione. The composition and structure of polysilsesquioxane was confirmed via 1H, 13C, and 29Si NMR spectroscopy, Fourier transform [...] Read more.
Soluble polysilsesquioxane containing side-chain phthalimide groups (PSQ-PhI) was synthesized via a solvent- and catalyst-free hydrolytic polycondensation reaction using 2-[3-(triethoxysilyl)propyl]-1H-isoindole-1,3(2H)-dione. The composition and structure of polysilsesquioxane was confirmed via 1H, 13C, and 29Si NMR spectroscopy, Fourier transform infrared spectroscopy, gel permeation chromatography, thermogravimetric analysis, dynamic light scattering, X-ray diffraction analysis, and elemental analysis. The synthesized silsesquioxane showed a monomodal molecular weight distribution. The average molecular weight of polysilsesquioxane is 11,200 Da, and the polydispersity index is 1.10. 29Si NMR analysis showed a half-peak width w1/2 3.1 ppm at δ −68.3, which corresponds to the PhI(CH2)3SiO3/2 unit and indicates an ordered structure in the polymer, with some defects caused by the presence of uncondensed silanol groups. PSQ-PhI showed good thermal stability (Td5% decomposition at 345 °C). The polysilsesquioxane-based coating was transparent in the visible region. Full article
(This article belongs to the Special Issue New Horizons in Silicon Chemistry)
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