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A convenient method was reported to synthesize 3-(4′-nitrophenyl)iminocoumarin by a cyclization reaction following a Knoevenagel reaction of 2-hydroxybenzaldehyde with 4-nitrophenylacenitrile in an ethanol solution. Piperidine or piperazine was employed respectively as catalyst. Crystal structure of 3-(4′-nitrophenyl)iminocoumarin shows that the molecules are H-aggregation due to π–π stacking and hydrogen bonds between adjacent molecules, as a result, electrons would transfer easily from a molecule to an adjacent molecule. Based on theoretical calculations of the electronic structures and thermodynamic parameters of the reactive intermediates in these cyclization reactions, the reaction mechanisms were postulated. Data of single crystal and spectrum of UV–vis absorption show that 3-(4′-nitrophenyl)iminocoumarin is good π-conjugated compound and would be potentially employed as donor–acceptor polymer units for developing bulk heterojunction solar cell. This paper suggests a convenient and effective method for synthesizing ring-locked D–A copolymer units for developing solar cell materials. [ABSTRACT FROM AUTHOR]

Two coordination polymers, namely {[Cd3(TIYM)2(5-SASS)2(H2O)2]·H2O}n (1) and {[Zn2(TIYM)(5-SASS)(μ2-OH)]·5H2O}n (2), were assembled using a mixed ligand strategy with the semi-rigid linker tetrakis(imidazol-1-ylmethyl)methane (TIYM) and 5-sulfoisophthalic acid sodium salt (5-SASS). Luminescence studies reveal that compounds 1 and 2 show strong fluorescence and exhibit efficient luminescence quenching in detecting UO22+ cations, Cr2O72−/CrO42− anions, and the NFT antibiotic in aqueous media, and can thus serve as promising sensors. The detection limits of compounds 1–2 are 1.96 × 10−4/1.36 × 10−4 M for UO22+ cations, 6.53 × 10−5/5.41 × 10−5 M for Cr2O72− anions, 2.29 × 10−4/1.04 × 10−4 M for CrO42− anions, and 5.62 × 10−5/4.74 × 10−5 M for the NFT antibiotic, respectively, indicating that the two CPs are promising multi-functional luminescent sensors. Additionally, the possible mechanisms for luminescence quenching have been investigated using spectral overlap experiments and DFT calculations. [ABSTRACT FROM AUTHOR]

Objective: To investigate the protein expression of visfatin and its gene polymorphism in non-small cell lung cancer (NSCLC) patients. Methods: The plasma level of visfatin was detected by enzyme-linked immunosorbent assay, and the genotypes rs59744560, rs9770242, and rs61330082 in the visfatin gene were detected by gene sequencing. Result: This study revealed that plasma levels of visfatin in NSCLC patients were significantly higher than the levels in healthy people (p < 0.01). The high level of plasma visfatin was found to be significantly correlated with TNM stage (p < 0.05). No mutations were detected in rs59744560 and rs9770242 loci. Three genotypes (CC, CT, and TT) were detected in rs61330082 locus, and the differences in the frequency distribution of these genotypes were significant in the two groups (p < 0.05). Central obesity and the CC genotype were independent risk factors in the pathogenesis of NSCLC (p < 0.05). Conclusion: The plasma visfatin level in NSCLC patients significantly increased, and high plasma visfatin levels were correlated with tumor stage. Gene polymorphism was found in the visfatin gene rs61330082 locus. The CC genotype might increase the risk for patients suffering from NSCLC, while the CT genotype, TT genotype, and T allele may reduce the risk of NSCLC. The rs61330082 locus can be used as genetic markers of high-risk populations. [ABSTRACT FROM AUTHOR]

Planar molecules 3,7-diaryl-1,5,2,4,6,8-dithiotetrazocines would be potential acceptor materials of organic solar cell because of their containing SN units. One-pot synthetic procedures of 3,7-diaryl-1,5,2,4,6,8-dithiotetrazocine compounds are developed to improve their yields up to 2.1-5.9 times as much as those in literatures. The geometries of title compounds were optimized by the density functional theory calculations. Their optoelectronic properties were studied by ultraviolet and cyclic voltammetry spectra and fluorescence quenching experiments. The highest occupied and lowest unoccupied molecular orbital energy level values show that these compounds are suitable to be employed as acceptor materials for developing bulk heterojunction organic with high open circuit voltages. Emission fluorescence of poly(3-hexylthiophene) at excited state in dichloromethane was quenched by addition of title compound. Therefore, these compounds used as acceptor materials could exhibit good mobility. [ABSTRACT FROM AUTHOR]

A series of planar 1,5,2,4,6,8-dithiotetrazocine derivatives were synthesized for study on charge transfer at donor/acceptor interface. The fluorescence quenching spectra, and the highest occupied molecular orbital (−6.10 ∼ −6.25 eV) and the lowest unoccupied molecular orbital (−3.45 ∼ −3.58 eV) energy levels of these 1,5,2,4,6,8-dithiotetrazocine derivatives show that they would be potential acceptor materials. Based on theoretical calculations, thermodynamic study on charge transfer at donor/acceptor interface was carried out. The results of experiments and theoretical calculations show that the electrons could transfer spontaneously from poly(3-hexylthiophene) to these acceptors. The percentages of fluorescence quenching increase with negative Gibbs free energy values increasing in the charge transfer procedures. Therefore, short circuit current values of organic solar cells would increase with the Gibbs free energy values increasing. This paper suggests a useful way for developing efficient organic solar cells. [ABSTRACT FROM AUTHOR]

Objective To evaluate the efficacy and adverse reactions of chemoradiotherapy with S-1 for elder patients with local advanced esophageal cancer. Methods Total of 66 elder patients with local advanced esophageal cancer were randomized into two groups. 32 cases as control group, received 3D conformal radiation therapy with DT: 54Gy/30f only. 34 cases as therapy group, S-1 was administered two cycles, 60-80 mg/(m2.d) on days 1-14, every 21 days as a cycle, combined with 3D conformal radiation therapy with same dose. Results The response rate of control group and therapy group was 59.4% and 82.4% (x² = 4.246, P = 0.039), respectively. The median time to progression was months 4.0 (95%CI: 2.91-5.10) and 6.0 months (95%CI: 4.58-7.42; P = 0.04). The median survival time was 8.0 months (95% CI: 6.01-10.00 in the control group and 11.0 months (95% CI: 9.45-12.52; P = 0.039). There were significant differences between the two groups. The incidence rate of myelosuppression was higher in therapy group, but was easy to handle. Conclusion S-1 combined with 3D conformal radiation therapy showed reliable efficacy and the toxicity was tolerable. [ABSTRACT FROM AUTHOR]