A triphenylamine-based aggregation-enhanced emission probe for viscosity and polarity analysis of lubricating oils

Lubricating oil offers abundant information about the operating state of machine. In this work, a donor-acceptor aggregation-enhanced emission fluorescent molecule, (Z)-4-(1-cyano-2-(4-(diphenylamino)phenyl)vinyl)benzonitrile (CPA-TPA), was synthesized to investigate its function to sense...

Evolution of Physicochemical Properties of 2-(2-(4-(4-chloro) phenyl) vinyl)-1, 1, 3-trimethyl-1H-benzo[e] Indolium Iodide via Experimental and Quantum Chemical Calculation for Third-Harmonic Generation Applications

In this work, the authors have reported the synthesis, crystal structure, and physicochemical properties of new Indolium based nonlinear optical crystal of 2-(2-(4-(4-chloro) phenyl) vinyl)-1, 1, 3-trimethyl-1H-benzo[e] Indolium iodide. The title crystal was grown by slow evaporation technique using methanol as a solvent. The harvested crystal is subjected to the single-crystal X-ray diffraction study and found that the title crystal belongs to the monoclinic system with a space group of P21/n. The bandgap and optical window of the material are studied by UV-visible spectroscopic analysis, and the found values are 4.2 eV and 295-800 nm, respectively. The grown crystal is subjected to analyze the thermal stability and found that high-temperature stability value upto 264 oC and which is sufficient for industrial applications. Furthermore, the effect of temperature on the grown crystal dielectric properties such as dielectric constant and dielectric losses is investigated by impedance spectroscopic analysis. The molecular charge transfer on the material is studied from density functional theory. The various intermolecular interactions existence in the crystal is explored from Hirshfeld surface analysis. Finally, the Z-scan parameters expose that title crystal is a potential material for third-harmonic generation applications. The overall structural studies and functional properties disclose that the grown crystal is well suitable for harmonic generation applications.

Theoretical and Experimental investigation of PVMQ/ EPDM-g-MA/CR blends: Rheological, Compatibility and Mechanical Properties

The main problem of uncompatibilize rubbers nano-composites in polymeric matrix are accumulation and agglomeration of graphene oxide. In this study, EPDM-g-MA was used as a compatibilizer for better dispersion of graphene oxide (GO) in the phenyl-vinyl-methyl-polysiloxane/chloroprene rubber (PVMQ/CR) matrix. To achieve this purpose mechanical characterizations, rheology, morphology and curing characterizations of nano-composite was investigated. SEM and TEM were used to assess surface characteristics, morphology and dispersion of EPDM-g-MA in PVMQ/CR nano-composite, which showed the size of EPDM-g-MA in the blends became smaller, denser and more uniform. Also, the results showed that, by increasing the GO nano-platelets in PVMQ/CR matrix during the reaction with EPDM-g-MA, curing properties was improved such a way that optimum curing time and scorch time were decreased and also MH–ML and cure rate index (CRI) were increased and also toughness strength enhanced. In addition, the mechanical properties indicated that tensile strength, fatigue strength, hardness, elongation-at-break and modulus increased by the incorporation with GO nano-platelets.

Synthetic Studies of Daphniphyllum Alkaloids: A New Method for the Construction of [7-5-5] All-carbon Tricyclic Skeleton

Daphniphyllum alkaloids have a complex molecular structure; thus, their synthesis can be challenging. A new method for the construction of the [7-5-5] tricyclic core of Daphniphyllum alkaloids was developed. The bicyclo[5.3.0]decane skeleton was constructed via the divinylcyclopropane rearrangement of a cyclopentenone derivative with a vinylcyclopropyl group at the β-position. After introducing a 2-iodoethyl group via a regioselective Michael addition with phenyl vinyl selenone, the [7-5-5] tricyclic system was formed by the intramolecular alkylation reaction of a cyclopentadienyl anion species.

Benzil Photoperoxidations in Polymer Films and Crosslinking by the Resultant Benzoyl Peroxides in Polystyrene and Other Polymers

Benzil (BZ) can be converted almost quantitatively to benzoyl peroxide (BP) in aerated polymer films upon irradiation at >400 nm (i.e., the long-wavelength edge of the n→π* absorption band of BZ, where BP does not absorb). Here, we summarize results for the photoperoxidation of BZ structures with molecular oxygen, principally in glassy polymer matrices. Some of the polymers are doped directly with BZ or its derivatives, and others, contain covalently attached BZ pendant groups from which BP groups are derived. While the decomposition of low-molecular-weight BP doped into polymer films (such as those of polystyrene (PS)) results in a net decrease in polymer molecular weight, thermal decomposition of pendant BP groups is an efficient method for chain crosslinking. Crosslinking of PS films doped with a molecule containing two covalently linked BZ or BP groups proceeds in a similar fashion. Free radicals from the covalently attached BP allow grafting of new monomers, as well. Additionally, the use of radiation filtered through masks has been used to create patterns of polymers on solid surfaces. Crosslinking of photodegradable poly(phenyl vinyl ketone) with BP structures obtained by photoperoxidation of BZ structures for the preparation of photodegradable polymer networks is described as well. In sum, the use of BZ and BP and their derivatives offers simple and convenient routes for modifying polymer chains and, especially, for crosslinking them. Specific applications of each use and process are provided. Although applications with PS are featured here, the methodologies described are amenable to a wide variety of other polymers.

Characterization of Microbial pigments from a combination of Citrus limon peel and Carica papaya pulp extract by using Penicillium purpurogenum

The present examination was done for assurance of the microbial colors present in the blend of Citrus limon (strip) and Carica papaya (pulp) is the restoratively significant plant having a place with the Rutaceae and Caricaceae family individually. In the present investigation, the concentrate of Citrus limon strip with Carica papaya mash has been exposed to aging by utilizing Pencillium purpurogenum and broke down by explanatory systems. This investigation uncovered that microbial concentrate of Citrus limon and Carica papaya contains Silanediol dimethyl, 3-furaldehyde, 4-hepten-3-one, 3-undecen-5-yne, 3-cyclohexon-ol, 3,4,5-Trimethylpyrano[2,3-c]pyrazol-6(1H)-one, N-didehydrohexacarboxyl-2,4,5-trimethylpiperazine, 6,10-Dimethoxy-3,3-dimethyl-1-(methylsulfanyl) - 2-aza-spiro [4.5] deca-1,6,9-trien-8-one, 9-octadecenoic corrosive, 2H-1-benzopyran-2-one, Di-n-octyl phthalate, 2-[2-(4-chloro-phenyl)- vinyl]-1-(2-phenoxy-ethyl)- 1h-benzoimidazole, lilial, Cyclohexane, and 3',4',5,6,7,8-Hexamethoxyflavone defending the utilization of this plant to treat numerous aliments in society and homegrown prescription.

Synthesis and Characterization of Some New Coumarin Derivatives as Probable Breast Anticancer MCF-7 Drugs

This study aimed to synthesize quinolinone derivatives and investigate their cytotoxic activity. The compound 1-azacoumarin-3-carboxylic acid (2-oxo-1H-quinoline-3-carboxylic acid) was obtained via the cyclocondensation of 2-hydroxybenzaldehyde with diethyl malonate in base catalyst to give ethyl coumarin-3-carboxylate, followed by the ammonolysis of ester (ethyl coumarin-3-carboxylate) with ammonia in the presence of anhydrous potassium carbonate. Treatment of 2-oxo-1H-quinoline-3-carboxylic acid with acetic anhydride, cinnamaldehyde, cinnamic acid and methyl 5-phenyl-2-cyano-2,4-pentadienoate under different conditions led to the formation of 1 (substituted) aza coumarin-3-carboxylic acids (1-N-(acetyl)-azacoumarin-3-carboxylic acid 1-N-(2-Formyl-1-phenyl) vinyl-azacoumarin-3-carboxylic acids 1-N-[2-(Hydroxy) carbonyl-1-(Phenyl) vinyl]-azacoumarin-3-carboxylic acid and 1-N-(4-Cyano-5-methoxy-5-oxo-1-Phenylpenta-1,3-diene-1-y)-azacoumarin-3-carboxylic 284 acid), respectively. The structures of synthesized 1-(substituted) azacoumarin-3-carboxylic acids were confirmed based on spectroscopic methods (IR and NMR), along with elemental analyses. Interestingly compound 6 demonstrated probable impacts as an anti-cancer drug against the MCF-7 cell line. The mechanism of action was assessed using a flow cytometric assay. The outcomes revealed that compound 6 could arrest the cell cycle at G2/M phase and pre-G1 apoptosis.

Efficient Regioselective Synthesis of Novel Water-Soluble 2H,3H-[1,4]thiazino[2,3,4-ij]quinolin-4-ium Derivatives by Annulation Reactions of 8-quinolinesulfenyl Halides

Regioselective synthesis of novel 2H,3H-[1,4]thiazino[2,3,4-ij]quinolin-4-ium derivatives has been developed by annulation reactions of 8-quinolinesulfenyl halides with vinyl chalcogenides (vinyl ethers, divinyl sulfide, divinyl selenide and phenyl vinyl sulfide) and tetravinyl silane. The novel reagent 8-quinolinesulfenyl bromide was used in the annulation reactions. The influence of the substrate structure and the nature of heteroatoms on the direction of the reactions and on product yields has been studied. The opposite regiochemistry was observed in the reactions with vinyl chalcogenides and tetravinyl silane. The obtained condensed heterocycles are novel water-soluble functionalized compounds with promising biological activity.