Novel Photoluminescent Polymers Containing Oligothiophene and <i>m</i>-Phenylene-1,3,4-oxadiazole Moieties: Synthesis and Spectroscopic and Electrochemical Studies

Three conjugated polymers containing oligothiophene units (from one to three thiophene rings) and aromatic 1,3,4-oxadiazole moieties have been successfully synthesized. The polymer structures were characterized and confirmed by 1H and 13C NMR, FT-IR, and elemental analysis. Thermogravimetric analysis demonstrated that the polymers are highly thermal stable. Tunable absorption (from 342 to 428 nm) and fluorescence (from 411 to 558 nm) properties of polymers were observed. The electrochemical investigation indicated that the LUMO and HOMO energy levels of the new polymers could be adjusted. It was also revealed by the electrochemical analysis that the polymers have good charge injection properties for both p-type and n-type charge carriers, as well as good color tunable luminescence and film-forming properties, which makes them potentially useful for fabricating efficient light-emitting devices

In situ Growth of UiO-66 with Its Particle Size Reduced by 90% into Porous Polyacrylate: Experiments and Applications

In this study, we successfully synthesized a novel composite material UiO-66/polyacrylate (UiO/PA) by suspension polymerization and in situ growth of metal–organic frameworks (MOFs). Due to the control of heterogeneous nucleation and firm growth, nano-UiO-66 with a diameter of only 400 nm has been reduced by about 90%, resulting in lower transfer resistance, effective separation of photogenerated carriers, and more catalytic active sites exposed. Under visible light irradiation, UiO/PA with 48.7% loading can almost completely degrade rhodamine B (RhB) in 120 min and the corresponding degradation rate constant of RhB reached 0.0203 min–1 from 0 min–1. After easy filtration and five cycles, the degradation rate is still above 85%. This study can provide new insights into effectively improving the photocatalytic performance of MOFs

Efficient Catalysis of Calcium Carbide for the Synthesis of Isophorone from Acetone

The liquid-phase aldol condensation of acetone for the synthesis of isophorone (IP) was studied under catalysis of CaC₂ powder for the first time. The reaction products were analyzed by gas chromatography, gas chromatography–mass spectrometry, and X-ray diffraction. The catalytic behavior of CaC₂ was studied at varying temperature, particle size, and dosage and compared with that of Ca­(OH)₂ and other basic catalysts. It was found that CaC₂ shows excellent catalytic performance because of its strong Lewis basicity and dehydrating ability, and CaC₂ is converted to Ca­(OH)₂ and acetylene simultaneously by the resulting water. Higher temperature, smaller catalyst size, and higher mass ratio of CaC₂ are beneficial to the IP synthesis. The overall catalytic performance of CaC₂ is superior to that of all basic catalysts reported heretofore. This process combines the hydrolysis of CaC₂ and the aldol condensation of acetone into a one-pot reaction, which promotes the condensation of acetone greatly along with the quantitative reclamation of acetylene. Thus, this process can be thought of as a green, cost-effective, and efficient route for the synthesis of IP and provides a valuable use of CaC₂

Tuning Redox Behavior and Emissive Wavelength of Conjugated Polymers by <i>p</i><i>−</i><i>n</i> Diblock Structures

Tuning Redox Behavior and Emissive Wavelength of Conjugated Polymers by p−n Diblock Structure

Additional file 1 of The role of left atrial strain in patients with functional tricuspid regurgitation before and after annuloplasty: a long-term follow-up study

Additional file 1

A One-Step Synthesis of a Poly(iptycene) through an Unusual Diels−Alder Cyclization/Dechlorination of Tetrachloropentacene

We have discovered the first reaction of a substituted pentacene molecule as a dienophile. A surprisingly clean Diels−Alder self-coupling of Cl4Pn leads to a novel ladder polymer, poly(iptycene), which can be converted to a conducting carbon at relatively low temperature (600−900 °C). Theoretical calculations of the former reaction suggest a biradical asymmetric mechanism, despite highly symmetric reactants

Tuning Redox Behavior and Emissive Wavelength of Conjugated Polymers by <i>p</i><i>−</i><i>n</i> Diblock Structures

Tuning Redox Behavior and Emissive Wavelength of Conjugated Polymers by p−n Diblock Structure

Removal of Thiophenic Sulfurs Using an Extractive Oxidative Desulfurization Process with Three New Phosphotungstate Catalysts

Three Keggin-type phosphotungstates, i.e. [C5H5NH]3PW12O40, [C4H6N2H]3PW12O40·3C4H6N2 and [(C4H9)4N]3PW12O40, were synthesized and characterized by elemental analysis, X-ray diffraction, and infrared spectra, meanwhile their catalysis in an extractive catalytic oxidative desulfurization process was studied with ionic liquid (IL) as extractant and H2O2 as oxidant. The main factors affecting the desulfurization process were investigated, including temperature, hydrophobicity of IL, and variety of S-compounds, as well as the amount of catalyst, IL, and H2O2. Under the optimal conditions, the S-content of DBT oil can be decreased from 1000 to 2 ppm. A new interpretation is proposed for the current process, in which IL is assumed as a reaction phase, and the amount of the extracted S-compound and the peroxidized catalyst wherein greatly affect the desulfurization rate. Besides, the IL with the dissolved catalyst can be reused many times and regenerated easily

Solution-Processable Neutral Green Electrochromic Polymer Containing Thieno[3,2‑<i>b</i>]thiophene Derivative as Unconventional Donor Units

In the quest to develop novel solution-processable neutral green electrochromic polymers, the donor–acceptor (D–A) polymer PBOTT-BTD has been synthesized through direct C–H arylation polycondensation, using 3,6-bis­(hexyloxy)­thieno­[3,2-<i>b</i>]­thiophene instead of conventional D units and benzo­[<i>c</i>]­[1,2,5]­thiadiazole as the A unit. PBOTT-BTD films obtained through spray-coating were investigated systematically; this green polymer turned blue in the oxidized state, realizing a conversion between two primary colors. PBOTT-BTD exhibited rapid response times, desirable contrasts in both the visible and near-infrared (NIR) regions, favorable efficiencies, and reasonable optical memory and stability, making it a promising candidate for use as a new green electrochromic conjugated polymer. Accordingly, PBOTT-BTD might have applicability not only as an electrochromic material but also in NIR or optical memory devices, perhaps even in supercapacitor applications; the use of thieno­[3,2-<i>b</i>]­thiophene units presenting alkoxy groups might also allow the preparation of novel D–A conjugated polymers when matched with various acceptor units

Synthesis and Supercapacitor Application of Alkynyl Carbon Materials Derived from CaC₂ and Polyhalogenated Hydrocarbons by Interfacial Mechanochemical Reactions

The discovery of new carbon materials and the reactive activation of CaC₂ are challenging subjects. In this study, a series of alkynyl carbon materials (ACMs) were synthesized by the interfacial mechanochemical reaction of CaC₂ with four typical polyhalogenated hydrocarbons. Their properties and structures were characterized, and their electrochemical performances were examined. The reaction was rapid and efficient arising from the intense mechanical activation of CaC₂. The ACMs are micro–mesoporous materials with distinct layered structure, specific graphitization degree, and clear existence of sp-C. In addition, the ACMs exhibit high specific capacitance in the range of 57–133 F g^–1 and thus can be ideal candidates for active materials used in supercapacitors. The results may imply an alternative synthesis of carbon allotropes, as well as an efficient approach for the activation of CaC₂