Silasesquioxanes as ligands in inorganic and organometallic chemistry
TL;DR: The synthesis, characterization, and reactivity of silasesquioxane ligands are surveyed in this article for both main group and transition-metal elements, and a variety of coordination environments can be supported by these ligands, and it is now possible to prepare metallasilsesquioxanes containing practically any stable element from Groups 1015.
About: This article is published in Polyhedron.The article was published on 1995-10-01. It has received 358 citations till now. The article focuses on the topics: Organometallic chemistry.
Citations
More filters
TL;DR: Site Heterogeneous Catalysts: Strategies, Methods, Structures, and Activities
Abstract: Site Heterogeneous Catalysts: Strategies, Methods, Structures, and Activities Christophe Copeŕet,*,† Aleix Comas-Vives,† Matthew P. Conley,† Deven P. Estes,† Alexey Fedorov,† Victor Mougel,† Haruki Nagae,†,‡ Francisco Nuñ́ez-Zarur,† and Pavel A. Zhizhko†,§ †Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1−5, CH-8093 Zürich, Switzerland ‡Department of Chemistry, Graduate School of Engineering Science, Osaka University, CREST, Toyonaka, Osaka 560-8531, Japan A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str. 28, 119991 Moscow, Russia
561 citations
496 citations
461 citations
TL;DR: In this article, the authors evaluated the properties of polyhedral oligosilsesquioxane (POSS)-based hybrid polymers and their potential in the development of a wide range of hybrid nanomaterials.
Abstract: Polyhedral oligosilsesquioxane (POSS)-based hybrid polymers have generated much interest recently, both from the academic and industrial points of view. POSS are completely defined molecules of nanoscale dimensions that may be functionalized with reactive groups suitable for the synthesis of new organic–inorganic hybrids, thus providing the opportunity to design and build materials with extremely well-defined dimensions possessing nanophase behavior. POSS have been successfully incorporated into common polymers via copolymerization, grafting or blending. A variety of POSS-containing copolymers have been prepared and they have displayed great potential in the development of a wide range of hybrid nanomaterials with diverse properties. This work has critically evaluated the recent developments in syntheses of POSS polymer materials leading to POSS nanocomposites. The syntheses of POSS cages, monomers containing POSS cages, POSS-dendrimers' cores, POSS-containing polymers (nanobuilding blocks) and POSS nanocomposites are described in detail. This work also assesses the properties of POSS nanobuilding blocks that can be otherwise used for developing nanocomposites. Such properties include mechanical, thermal, flame-retardant and viscoelastic properties. Investigations into the structure, morphology and compatibility of POSS nanobuilding blocks have been reviewed. Other properties covered include the ion-mobility and swelling characteristics as well as porosity of POSS nanobuilding blocks. Lastly, existing and possible future applications are highlighted and final conclusions are drawn.
342 citations
319 citations
References
More filters
Book•
01 Jan 1999
TL;DR: Cotton and Wilkinson's Advanced Inorganic Chemistry (AIC) as discussed by the authors is one of the most widely used inorganic chemistry books and has been used for more than a quarter century.
Abstract: For more than a quarter century, Cotton and Wilkinson's Advanced Inorganic Chemistry has been the source that students and professional chemists have turned to for the background needed to understand current research literature in inorganic chemistry and aspects of organometallic chemistry. Like its predecessors, this updated Sixth Edition is organized around the periodic table of elements and provides a systematic treatment of the chemistry of all chemical elements and their compounds. It incorporates important recent developments with an emphasis on advances in the interpretation of structure, bonding, and reactivity.From the reviews of the Fifth Edition:* "The first place to go when seeking general information about the chemistry of a particular element, especially when up-to-date, authoritative information is desired." -Journal of the American Chemical Society.* "Every student with a serious interest in inorganic chemistry should have [this book]." -Journal of Chemical Education.* "A mine of information . . . an invaluable guide." -Nature.* "The standard by which all other inorganic chemistry books are judged."-Nouveau Journal de Chimie.* "A masterly overview of the chemistry of the elements."-The Times of London Higher Education Supplement.* "A bonanza of information on important results and developments which could otherwise easily be overlooked in the general deluge of publications." -Angewandte Chemie.
12,231 citations
TL;DR: In this paper, a precursor to imido alkylidene complexes that is related to 2 has been prepared by the sequence MoO{sub 2} {yields} MoO(NAr)Cl{sub 3} (dme = 1,2-dimethoxyethane) and Me{ sub 3}SiNHAr (Ar = 2,6-diisopropylphenyl) yields Mo(C-t-Bu)(NHAr), which upon treatment with a catalytic amount of NEt-sub 3] is transformed into
Abstract: The reaction between Mo(C-t-Bu)(dme)Cl{sub 3} (dme = 1,2-dimethoxyethane) and Me{sub 3}SiNHAr (Ar = 2,6-diisopropylphenyl) yields Mo(C-t-Bu)(NHAr)Cl{sub 2}(dme) (1), which upon treatment with a catalytic amount of NEt{sub 3} is transformed into Mo(CH-t-Bu)(NAr)Cl{sub 2}(dme) (2). Complexes of the type Mo(CH-t-Bu)(NAr)(OR){sub 2} (OR = OCMe(CF{sub 3}){sub 2}, OCMe{sub 2}(CF{sub 3}), O-t-Bu, or OAr) have been prepared from 2. Complexes of the type Mo(C-t-Bu)(NHAr)(OR){sub 2} (OR = OCMe(CF{sub 3}){sub 2} or OAr) have been prepared from 1, but they cannot be transformed into Mo(CH-t-Bu)(NAr)(OR){sub 2} complexes. A precursor to imido alkylidene complexes that is related to 2 has been prepared by the sequence MoO{sub 2} {yields} MoO{sub 2}Cl{sub 2} {yields} Mo(NAr){sub 2}Cl{sub 2} {yields} Mo(NAr){sub 2}(CH{sub 2}R{prime}){sub 2} {yields} Mo(CHR{prime})(NAr)(OTf){sub 2}(dme) (R{prime} = t-Bu or CMe{sub 2}Ph; OTf = OSO{sub 2}CF{sub 3}). Mo(CH-t-Bu)(NAr)(OTf){sub 2}(dme) crystallizes in the space group P{anti 1} with a = 17.543 {angstrom}, b = 19.008 {angstrom}, c = 9.711 {angstrom}, {alpha} = 91.91{degree}, {beta} = 99.30{degree}, {gamma} = 87.27{degree}, Z = 4, M{sub r} = 729.60, V = 3,191.1 {angstrom}{sup 3}, {rho}(calcd) = 1.518 g cm{sup {minus}3}.
928 citations
704 citations
TL;DR: In this article, a single-crystal X-ray diffraction study of trisilanol 1 and 3b has been carried out, showing structural similarities with trifunctional monomers.
Abstract: The hydrolytic condensation of cyclohexyltrichlorosilane (CySiCl/sub 3/) affords (Cy/sub 7/Si/sub 7/O/sub 9/(OH)/sub 3/) (1), (Cy/sub 6/Si/sub 6/O/sub 9/) (2), and (Cy/sub 8/Si/sub 8/O/sub 11/(OH)/sub 2/) (3a). Trisilanol 1 and 3b, the bis(triphenyltin) derivative of 3a, have been structurally characterized by single-crystal X-ray diffraction studies. Trisilanol 1 undergoes corner-capping reactions with trifunctional monomers (e.g., R'SiCl/sub 3/, MeGeCl/sub 3/, MeSnCl/sub 3/), is selectively monosilylated to (Cy/sub 7/Si/sub 7/O/sub 9/(OH)/sub 2/OTMS) (6a) with chlorotrimethylsilane, and can be dehydrated to (Cy/sub 7/Si/sub 7/O/sub 10/(OH)) (7a). Comparison of the molecular structure of 1 with (111) /beta/-cristobalite and (0001) /beta/-tridymite reveals many structural similarities. Silsesquioxanes 1, 6a, and 7a are discussed as models for silica surfaces.
563 citations