- Ultralong Phosphorescence from Organic Ionic Crystals under Ambient Conditions
-
A new type of materials, organic salts in the crystal state, have ultralong organic phosphorescence (UOP) under ambient conditions. The change of cations (NH4+, Na+, or K+) in these phosphors gives access to tun
- Cheng, Zhichao,Shi, Huifang,Ma, Huili,Bian, Lifang,Wu, Qi,Gu, Long,Cai, Suzhi,Wang, Xuan,Xiong, Wei-Wei,An, Zhongfu,Huang, Wei
-
-
Read Online
- Cyanostilbene-based near-infrared emissive platinum(II) metallacycles for cancer theranostics
-
In this work, a near-infrared emissive dipyridyl ligand was synthesized and used to prepare three platinum(II) metallacycles with different shapes via metal-coordination-driven self-assembly with different platinum(II) precursors. These metallacycles were further used for both cell imaging and cancer therapy, offering a new type of theranostic agents towards cancer treatment.
- Ma, Lingzhi,Yang, Tianfeng,Zhang, Zeyuan,Yin, Siping,Song, Zhongxiao,Shi, Wen,Chu, Dake,Zhang, Yanmin,Zhang, Mingming
-
-
Read Online
- A Reduced Graphene Oxide/Disodium Terephthalate Hybrid as a High-Performance Anode for Sodium-Ion Batteries
-
As a promising candidate for large-scale energy storage systems, sodium-ion batteries (SIBs) are experiencing a rapid development. Organic conjugated carboxylic acid anodes not only have tailorable electrochemical properties but also are easily accessible. However, the low stability and electrical conductivity hamper their practical applications. In this study, disodium terephthalate (Na2TP), the most favorable organic conjugated carboxylic acid anode material for SIBs, was proposed to integrate with graphene oxide (GO) by an anti-solvent precipitation process, which ensures the uniform and tight coating of GO on the Na2TP surface. GO is electrochemically reduced during the first several cycles of the electrochemical measurement, which buffers the volume change and improves the electrical conductivity of Na2TP, resulting in a better cyclic and rate performance. The incorporation of only 5 wt % GO onto Na2TP leads to a reversible capability of 235 mA h g?1 after 100 cycles at a current rate of 0.1 C, which is the best among the state of the art organic anodes for SIBs. The one-step synthesis together with the low costs of the raw materials show a promise for the scalable preparation of anode materials for practical SIBs.
- Cao, Tengfei,Lv, Wei,Zhang, Si-Wei,Zhang, Jun,Lin, Qiaowei,Chen, Xiangrong,He, Yanbing,Kang, Fei-Yu,Yang, Quan-Hong
-
-
Read Online
- Organic Thiocarboxylate Electrodes for a Room-Temperature Sodium-Ion Battery Delivering an Ultrahigh Capacity
-
Organic room-temperature sodium-ion battery electrodes with carboxylate and carbonyl groups have been widely studied. Herein, for the first time, we report a family of sodium-ion battery electrodes obtained by replacing stepwise the oxygen atoms with sulfur atoms in the carboxylate groups of sodium terephthalate which improves electron delocalization, electrical conductivity and sodium uptake capacity. The versatile strategy based on molecular engineering greatly enhances the specific capacity of organic electrodes with the same carbon scaffold. By introducing two sulfur atoms to a single carboxylate scaffold, the molecular solid reaches a reversible capacity of 466 mAh g?1 at a current density of 50 mA g?1. When four sulfur atoms are introduced, the capacity increases to 567 mAh g?1 at a current density of 50 mA g?1, which is the highest capacity value reported for organic sodium-ion battery anodes until now.
- Zhao, Hongyang,Wang, Jianwei,Zheng, Yuheng,Li, Ju,Han, Xiaogang,He, Gang,Du, Yaping
-
-
Read Online
- A polyimide based all-organic sodium ion battery
-
Developing new approaches to improve the performance of organic electrodes for rechargeable sodium batteries is important. Here, we report studies on N,N′-diamino-3,4,9,10-perylenetetracarboxylic polyimide (PI) as a novel cathode for a sodium battery and demonstrate an all-organic sodium ion battery using this polyimide as the cathode and disodium terephthalate (NaTP) (pre-sodiated) as the anode. The synthesised PI exhibits excellent electrochemical properties, when studied as the cathode for sodium batteries, with a reversible capacity of 126 mA h g-1 along with good capacity retention and rate capability, in the voltage range of 1.5 to 3.5 V vs. Na+/Na. The all-organic sodium ion full cell delivered an initial capacity of 73 mA h g-1, with an average cell voltage of 1.35 V. The attractive electrochemical performance combined with the design flexibility of a PTCDA based PI material, offer new possibilities for the development of efficient all-organic sodium ion batteries.
- Banda, Harish,Damien, Dijo,Nagarajan, Kalaivanan,Hariharan, Mahesh,Shaijumon, Manikoth M.
-
-
Read Online
- Inorganic-organic covalent hybrid of polyoxometalate-calixarene: Synthesis, characterization and enzyme mimetic activity
-
The inorganic-organic hybrid based on covalently attached trilacunary phosphotungstate and calixarene conjugate (POM-Calix hybrid) has been synthesized via facile click chemistry approach. The characterization studies showed that both the moieties are present together in the hybrid upon covalent modification. The morphology of the hybrid was studied by SEM, TEM and AFM analyses suggesting spherical shaped nanoparticles of 40–60 nm size for the hybrid. The POM-Calix hybrid was successfully employed to demonstrate peroxidase-like activity for the oxidation of the model substrate, viz., o-phenylenediamine (OPD), for the enzyme. The activity of the POM-Calix hybrid was ~170% greater than that exhibited by simple POM and this is mainly attributed to the introduction of hydrophobic character by the covalently attached calixarene conjugate and the hydrophobicity is supported by the contact angle measurement. From the kinetic studies, the Michaelis constants, Km and Vmax were estimated to be 2.55 mM and 0.756 × 10?8 M s?1, respectively. It was observed that, the POM-Calix hybrid facilitates the formation of [rad]OH radicals when treated with H2O2 which eventually results in the oxidation of the substrate. The POM-Calix hybrid exhibits excellent enzyme-like activity over a wide pH range, which would enable its bio-applications at physiological conditions.
- Narkhede, Nilesh,Uttam, Bhawna,Rao, Chebrolu Pulla
-
-
Read Online
- Dramatic luminescence signal from a Co(II)-based metal-organic compound due to the construction of charge-transfer bands with Al3+ and Fe3+ ions in water: Steady-state and time-resolved spectroscopic studie
-
To study the photophysics and understand the mechanism of metal ion sensing, a luminescent cobalt-based metal-organic compound, [Co(bpds)(bdc)(H2O)2]·bpds (1), was synthesized at room temperature from 4,4-bipyridyl disulphide (bpds) and 1,4-benzene dicarboxylic acid (bdc) by layer diffusion. Structure determination based on single-crystal X-ray analysis revealed a parallel interpenetrated structure of two-dimensional layers along with a layer of uncoordinated bpds ligand. An aqueous suspension of 1 showed intense blue emission at 421 nm. In the presence of few micromolar of Al3+ ions, a dramatic change in the luminescence spectrum around an isoemissive point was observed with the appearance of a new peak at 380 nm. A similar phenomenon was observed in the presence of Fe3+ ions. For other metal ions, no significant changes in the luminescence spectrum of 1 were observed. Detailed lifetime decay analysis and Fourier-transform infrared spectroscopy revealed that Al3+ ions form charge-transfer complexes (or adducts) with uncoordinated bpds ligands through pyridine nitrogen atoms, resulting in a new emission peak at 380 nm. Time-resolved study revealed that the quenching of luminescence was dynamic in nature and associated with an increase in the non-radiative rate constant. Moreover, the luminescence property of 1 was ultrasensitive to the presence of Al3+ and Fe3+ ions in water, even in a mixture of many other ions, with detection limits of 0.35 and 0.25 μM, respectively.
- Daga, Pooja,Majee, Prakash,Singha, De Bal Kanti,Manna, Priyanka,Hui, Sayani,Ghosh, Ananta Kumar,Mahata, Partha,Mondal, Sudip Kumar
-
-
Read Online
- Method for preparing agricultural fungicide
-
The invention discloses a method for preparing an agricultural fungicide. The method includes the following steps: adding phthalic acid into a sodium hydroxide solution to prepare a clarified para-phthalic sodium solution, adding an adjuvant agent into the clarified para-phthalic sodium solution, stirring the solution for a period of time, adding a soluble copper compound solution, heating the solution to an appropriate temperature, continuing stirring, and conducting filtering and washing to obtain copper terephthalate; adding copper terephthalate and a thickening agent in water, stirring the solution, then conducting wet grinding until the particle size of copper terephthalate is less than 5 micrometers, and conducting filtering and drying to obtain the target product. The preparation method is simple and easy to operate, and the obtained insecticide is a uniform suspension liquid, not settled after being stored for a long time and lasting in bactericidal effect. The agricultural fungicide is directly sprayed or sprayed after being diluted, and rapid and easy to use.
- -
-
Paragraph 0013
(2017/06/29)
-
- Organic sodium terephthalate@graphene hybrid anode materials for sodium-ion batteries
-
In the search for high-performance electrodes for sodium-ion battery applications, there is a high demand for organic materials with satisfactory electrochemical performances, especially high rate capabilities. Herein, we report an organic based composite, sodium terephthalate@graphene (Na2TP@GE) hybrid synthesized via freeze-drying technique. This material shows an interconnected, multi-channelled monolith structure, which resulted in outstanding rate capability for sodium storage. This hybrid material demonstrated a high reversible capacity of 268.9 mA h g-1 and prolonged cyclability with capacity retention of 77.3% over 500 cycles.
- Wang, Ying,Kretschmer, Katja,Zhang, Jinqiang,Mondal, Anjon Kumar,Guo, Xin,Wang, Guoxiu
-
p. 57098 - 57102
(2016/07/07)
-
- Relationship between interlayer anions and photoluminescence of layered rare earth hydroxides
-
The effect of interlayer anions on the photoluminescence of layered rare earth hydroxides was investigated with the rare earth (RE)-doped layered gadolinium hydroxynitrate as a representative base matrix for efficient and stable anion-exchange reactions. Eu3+, Tb3+, and Ce3+ were employed as RE activator ions for red, green, and blue emissions, respectively. The excitation and emission behaviors of Gd1.80RE0.20(OH)5X·nH2O (LGdH:RE) were systematically compared for various interlayer inorganic and organic anions, where X = F-, Cl-, I-, OH-, ClO3-, S2-, CO32-, SO42-, terephthalate, 2-naphthoate, and dodecylsulfate members were obtained by the exchange reaction of corresponding X = NO3- members. Interestingly, a close relationship was found between the UV-Vis absorption spectra of aqueous solutions containing X anions and the excitation behavior of LGdH:RE. Thus, NO3-, I-, and S2- anions showing high absorbance in aqueous solution consistently shielded the excitation light for the 8S7/2 → 6IJ transition of Gd3+ and the 4f → 5d interconfigurational transitions of Tb3+ and Ce3+ to turn off the corresponding emissions from LGdH:Eu, LGdH:Tb, and LGdH:Ce. In contrast, the effect of terephthalate and 2-naphthoate, despite high absorbance in aqueous solutions, was significantly different depending on the RE activator ion. It is proposed that an identical interlayer anion in the gallery of LRHs can filter or sensitize the UV energy for excitation of RE3+-doped LRHs and its role (whether as a filter, a sensitizer, or just a spacer) is determined by the nature of activator ions.
- Kim, Hyunsub,Lee, Byung-Il,Jeong, Heejin,Byeon, Song-Ho
-
p. 7437 - 7445
(2015/07/20)
-
- A Novel siloxane-containing dicarboxylic acid, 1,3-bis(p-carboxyphenylene- ester-methylene)tetramethyldisiloxane, and its derivatives: Ester macrocycle and supramolecular structure with a copper complex
-
The new dicarboxylic acid, 1,3-bis(p-carboxyphenylene-ester-methylene) tetramethyldisiloxane (H2L, 1) was obtained by treating 1,3-bis(chloromethyl)-1,1,3,3-tetramethyldisiloxane with a mixture of terephthalic acid and terephthalic acid sodium salt in a 1:1 ratio. In this approach, besides the desired compound 1 (33 wt % yield), the condensation cyclic dimer 2 (7 wt % yield) and an oligomer 3 (10 wt % yield) resulted. The reaction between dicarboxylic acid H2L, where L is the carboxylate ligand, along with imidazole as co-ligand, and copper hydroxide resulted in the formation of a coordination compound [Cu(HIm)4(H2O) 2]L·4.5H2O (4). Single-crystal X-ray crystallography has revealed that the crystal structure of 4 is a self-assembled H-bonded three-dimensional supramolecular structure. FTIR and NMR spectral techniques were also used to characterize the formed structures. Optical and thermal properties of all compounds were studied. The stability of the supramolecular structure in solution (methanol) and with temperature was studied using ATR-FTIR. The ability of the macrocycle 2 to bind potassium cations in solution was investigated by UV-vis spectrophotometry.
- Zaltariov, Mirela-Fernanda,Vlad, Angelica,Cazacu, Maria,Shova, Sergiu,Balan, Mihaela,Racles, Carmen
-
supporting information
p. 2661 - 2668
(2014/04/03)
-
- PROCESS FOR RECOVERING TEREPHTHALIC ACID
-
In a process for recovering terephthalic acid from its salts solution an aqueous solution of a terephthalic acid salt is fed into a cathode compartment of an electro dialysis cell and an electrolyte to an anode compartment, the resulting salt and electrol
- -
-
Page/Page column 5-6
(2008/06/13)
-
- CHEMICAL METHOD FOR RECYCLING POLYETHYLENE TEREPHTALATE (PET) WASTES
-
The present invention relates to a process for chemical recycling of PET waste that comprises, among other stages, a saponification reaction stage, wherein PET waste particles are reacted with stoichiometric or excessive amounts of a strong base metal in
- -
-
Page/Page column 5
(2008/06/13)
-
- Method for producing a purified alkaline metal terephthalate, derived from the products of saponification of polyterephthalates
-
The invention concerns a method for producing terephthalate of alkaline metal and alkylene glycol from recuperated alkylene polyterephthalate. It comprises saponification of said alkylene terephthalates with an aqueous sodium solution, adding a sufficient
- -
-
Page column 6-7
(2008/06/13)
-
- Removal of organic acids from dilute aqueous solutions of salts of organic acids by supercritical fluids
-
Process for recovering carboxylic acids from dilute aqueous solutions of alkali metal salts of such carboxylic acids by mixing such solutions with from 10 to 1000% of a supercritical solution comprising at least 10 mole % carbon dioxide at a pressure from 80 to 500 atm and preferably 100 to 350 atm and at a temperature of from 35° to 200° C. and preferably from 35° to 100° C. whereby the salt reacts with the carbon dioxide to form the carboxylic acid which dissolves in the supercritical fluid. The aqueous phase is allowed to separate from the supercritical fluid phase. The pressure of the supercritical phase is lowered which lowers the solubility of the carboxylic acid in the supercritical fluid so that an acid phase is formed separate from the supercritical fluid phase whereby recovery of the acid is effected.
- -
-
-
- Kinetics of Alkaline Hydrolysis of Diphenic and Terephthalic Acid Monomethyl Esters
-
The dependence of the rate constant of alkaline hydrolysis of diphenic acid monomethyl ester and terephthalic acid monomethyl ester on ionic strength and temperature was studied together with the specific influence of some electrolytes on the reaction rate.Thermodynamic activation parameters extrapolated to zero ionic strength and critical interionic distances of reacting ions were calculated from the temperature dependences of the rate constants.
- Holba, Vladislav,Benko, Jan,Kozankova, Jana
-
p. 255 - 262
(2007/10/02)
-