Synthesis and characterization of a polyferrocenyldistannane

2014 ◽  
Vol 92 (6) ◽  
pp. 525-532 ◽  
Author(s):  
Jon Ward ◽  
Saif Al-Alul ◽  
Shane Harrypersad ◽  
Daniel A. Foucher
Keyword(s):  
Molecular Weight ◽  
Elemental Analysis ◽  
Ring Opening ◽  
Electronic Communication ◽  
Ring Opening Polymerization ◽  
Synthesis And Characterization ◽  
Vis Spectroscopy ◽  
Metal Catalyzed

The distannyl-bridged poly bis(dimethylstannyl)ferrocene, 5, was synthesized through either the metal-catalyzed intermolecular dehydrogenative condensation of the bis(dimethylstannyl)ferrocene, 6, or the ring-opening polymerization of the distannane-bridged [2]ferrocenophane, 7. Both polymerization strategies yielded compounds displaying NMR (1H, 13C, 119Sn) evidence for a distannane bridged polymer. A modest moderate molecular weight (GPC; Mw = 9.5 × 104 Da, PDI = 1.76) was found for polymer 5 prepared by dehydrogenative condensation. Polymer 5 displayed electronic communication (≈ 0.2 V) between neighbouring iron centers, similar to those reported for monobridged ferrocenyl stannane polymers. Polymer 5 was further characterized by UV–vis spectroscopy, elemental analysis, and modeled with the related distannyl-8 and tristannyl-9 bisferrocenes using DFT at the SDD level of theory.

scholarly journals Synthesis and characterization of ferrocenyl stannanes and polyferrocenyl stannanes

2021 ◽  
Author(s):  
Jonathan Ward
Keyword(s):  
Ring Opening ◽  
1H Nmr Spectroscopy ◽  
Electronic Communication ◽  
Ring Opening Polymerization ◽  
Dft Modeling ◽  
Dehydrogenative Coupling ◽  
119Sn Nmr ◽  
Uv Visible ◽  
Metal Catalyzed

A novel polymer polybis(dimethyl stannyl)ferrocene was synthesized through both metal catalyzed intermolecular dehydrogenative condensation and ring-opening polymerization. This polymer was the first evidence of a dibridged polyferrocenyl stannane, and was found to be of low to moderate molecular weight by gel permation chromatography and 1H NMR spectroscopy. This polymer displayed extensive electronic communication observed previously synthesized monobridged ferrocenyl stannane polymers. The first tristanna-bridged 3.3]ferrocenophane was discovered through an amine coupling of a tin amine, and 1,1’bis(dimethyl stannyl) ferrocene. The [3.3]ferrocenophane displayed a strong interaction between connected ferrocenes despite the large distance, (8.49 Å) between Fe centers. Finally, a new and improved synthesis of 1,1,2,2-tetramethyldistanna-[2]ferrocenophane was found. This metal catalyzed intramolecular dehydrogenative coupling employs Pd2(dba)3 as a catalyst and yields 90% product. All products were characterized where possible 1H, 13C, and 119Sn NMR and UV-Visible spectrocopy, as well as through cyclic voltammetry and DFT modeling.

scholarly journals Synthesis and characterization of ferrocenyl stannanes and polyferrocenyl stannanes

2021 ◽  
Author(s):  
Jonathan Ward
Keyword(s):  
Ring Opening ◽  
1H Nmr Spectroscopy ◽  
Electronic Communication ◽  
Ring Opening Polymerization ◽  
Dft Modeling ◽  
Dehydrogenative Coupling ◽  
119Sn Nmr ◽  
Uv Visible ◽  
Metal Catalyzed

A novel polymer polybis(dimethyl stannyl)ferrocene was synthesized through both metal catalyzed intermolecular dehydrogenative condensation and ring-opening polymerization. This polymer was the first evidence of a dibridged polyferrocenyl stannane, and was found to be of low to moderate molecular weight by gel permation chromatography and 1H NMR spectroscopy. This polymer displayed extensive electronic communication observed previously synthesized monobridged ferrocenyl stannane polymers. The first tristanna-bridged 3.3]ferrocenophane was discovered through an amine coupling of a tin amine, and 1,1’bis(dimethyl stannyl) ferrocene. The [3.3]ferrocenophane displayed a strong interaction between connected ferrocenes despite the large distance, (8.49 Å) between Fe centers. Finally, a new and improved synthesis of 1,1,2,2-tetramethyldistanna-[2]ferrocenophane was found. This metal catalyzed intramolecular dehydrogenative coupling employs Pd2(dba)3 as a catalyst and yields 90% product. All products were characterized where possible 1H, 13C, and 119Sn NMR and UV-Visible spectrocopy, as well as through cyclic voltammetry and DFT modeling.

scholarly journals Synthesis and characterization of different soybean oil-based polyols with fatty alcohol and aromatic alcohol

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 491-499
Author(s):  
Fukai Yang ◽  
Hao Yu ◽  
Yuyuan Deng ◽  
Xinyu Xu
Keyword(s):  
Molecular Weight ◽  
Soybean Oil ◽  
Retention Time ◽  
Ring Opening ◽  
Isoamyl Alcohol ◽  
Synthesis And Characterization ◽  
Intermolecular Force ◽  
H Nmr ◽  
Epoxy Groups

Abstract In this article, five kinds of soybean oil-based polyols (polyol-E, polyol-P, polyol-I, polyol-B, and polyol-M) were prepared by ring-opening the epoxy groups in epoxidized soybean oil (ESO) with ethyl alcohol, 1-pentanol, isoamyl alcohol, p-tert-butylphenol, and 4-methoxyphenol in the presence of tetrafluoroboric acid as the catalyst. The SOPs were characterized by FTIR, 1H NMR, GPC, viscosity, and hydroxyl numbers. Compared with ESO, the retention time of SOPs is shortened, indicating that the molecular weight of SOPs is increased. The structure of different monomers can significantly affect the hydroxyl numbers of SOPs. Due to the large steric hindrance of isoamyl alcohol, p-hydroxyanisole, and p-tert-butylphenol, SOPs prepared by these three monomers often undergo further dehydration to ether reactions, which consumes the hydroxyl of polyols, thus forming dimers and multimers; therefore, the hydroxyl numbers are much lower than polyol-E and polyol-P. The viscosity of polyol-E and polyol-P is much lower than that of polyol-I, polyol-B, and polyol-M. A longer distance between the molecules and the smaller intermolecular force makes the SOPs dehydrate to ether again. This generates dimer or polymers and makes the viscosity of these SOPs larger, and the molecular weight greatly increases.

scholarly journals Synthesis and Characterization of Polyphosphazenes Modified with Hydroxyethyl Methacrylate and Lactic Acid

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Evelyn Carolina Martínez Ceballos ◽  
Ricardo Vera Graziano ◽  
Gonzalo Martínez Barrera ◽  
Oscar Olea Mejía
Keyword(s):  
Lactic Acid ◽  
Ring Opening ◽  
Room Temperature ◽  
Block Structure ◽  
Ring Opening Polymerization ◽  
Synthesis And Characterization ◽  
Poly Lactic Acid ◽  
Hydroxyethyl Methacrylate ◽  
H Nmr

Poly(dichlorophosphazene) was prepared by melt ring-opening polymerization of the hexachlorocyclotriphosphazene. Poly[bis(2-hydroxyethyl-methacrylate)-phosphazene] and poly[(2-hydroxyethyl-methacrylate)-graft-poly(lactic-acid)-phosphazene] were obtained by nucleophilic condensation reactions at different concentrations of the substituents. The properties of the synthesized copolymers were assessed by FTIR,1H-NMR and31P-NMR, thermal analysis (DSC-TGA), and electron microscopy (SEM). The copolymers have a block structure and show twoTg's below room temperature. They are stable up to a temperature of 100°C. The type of the substituents attached to the PZ backbone determines the morphology of the polymers.

Synthesis and Characterization of Polydimethylsiloxane (PDMS) with Medium Viscosity via Ring-Opening Polymerization

2021 ◽  
Vol 1028 ◽  
pp. 346-351
Author(s):  
Soni Setiadji ◽  
Zulfi Mofa Agasa ◽  
Diba G Auliya ◽  
Fitrilawati ◽  
Norman Syakir ◽  
...  
Keyword(s):  
Ring Opening ◽  
Vitreoretinal Surgery ◽  
High Viscosity ◽  
Ring Opening Polymerization ◽  
Vitreous Humour ◽  
Synthesis And Characterization ◽  
Low Viscosity ◽  
A Value ◽  
Medium Viscosity

Duration of use and injectability are external factors for Polydimethylsiloxane (PDMS) that needs to be considered when PDMS utilized as a vitreous substituted liquid in vitreoretinal surgery. In general, PDMS which has been used as a substitute for vitreous humour is PDMS with a low viscosity in the value about 1000 cSt and a high viscosity at a value of about 5000 cSt. Various deficiencies have been encountered from low and high viscosity of PDMS, causing research to be continued to obtain PDMS which has suitable properties as a substitute for vitreous humour. One of them is research to obtain medium viscosity of PDMS with a viscosity value of about 2000 cSt. Here, we reported synthesis and characterization of PDMS with medium viscosity in ranges from 1800 to 2600 mPas. PDMS was synthesized through Ring-Opening Polymerization (ROP) pathway using the monomer of Octamethylcyclotetrasiloxane (D4) and the chain terminator of Hexamethyldisiloxane (MM). Various concentrations of potassium hydroxide (KOH) of 3, 4, 6 and 8 %(w/v) were applied as initiator to form gel of PDMS. All synthesized PDMS samples were identified to have viscosity values of 1800-2600 mPas, refractive index values of 1.4042-1.4044 and surface tension values of 22-23 mN/m. Meanwhile, the results of Fourier-Transform Infrared (FTIR) measurement showed that the absorption peaks were similar to that of our previous report.

Synthesis and characterization of neutral and cationic aluminum complexes supported by a furfuryl-containing aminophenolate ligand for ring-opening polymerization of ε-caprolactone

2018 ◽  
Vol 42 (11) ◽  
pp. 8374-8383 ◽  
Author(s):  
Jiraya Kiriratnikom ◽  
Sucheewin Chotchatchawankul ◽  
Setsiri Haesuwannakij ◽  
Supavadee Kiatisevi ◽  
Khamphee Phomphrai
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Synthesis And Characterization ◽  
Aluminum Complexes

Mononuclear aluminum complexes supported by novel furfuryl-containing aminophenolate ligand are reported along with CL polymerization.

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